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6 Pinnacle Way, Pride Park, Derby, UK, DE24 8ZS

Sales:sales@mpec.co.uk
General Enquiries:enquiries@mpec.co.uk

© MPEC Ltd. 2016 All rights reserved.

No part of this publication may be copied without the prior consent of MPEC.

www.mpec.co.uk


Contents


1) Safety Information

1.1) Explanation of Symbols

 The following designations are used to bring important hazards and information to the attention of the user:

A real threat to human life. It must be adhered to at all times.

A possible dangerous situation. There could be a risk to human life is correct procedure is not followed.

A particularly useful application tip.

1.2) Intended Use

The intended use of the SA380-IT insulation monitor is to remotely monitor the resistance to earth (insulation resistance) of IT (earth-free) power supply circuits. Any other use, or use beyond the product specification is deemed improper. MPEC Tecnology Ltd shall not be liable for any loss or damage to life or property arising from improper use.

Correct use includes compliance with all instructions from the operation and maintenance manual with regard to transportation, installation, operation and maintenance.

1.3) Warranty & Liability

Warranty and Liability claims due to injury to persons or damage to property are excluded if they can be attributed to any of the following causes:

  • Improper use of the SA380-IT as defined in section 1.2.
  • Unauthorized modification to the SA380-IT, structural or electrical.
  • Unauthorized repair of the SA380-IT.
  • Disasters caused by foreign bodies, fire, or force majeure.

1.4) Personnel

Only personnel familiar with the installation, commissioning and operation of the SA380-IT may work with the SA380-IT. Such personnel must:

  • Read and understand the safety chapter of this document. 
  • Undertake appropriate training in the installation of electrical equipment.
  • Comply with all rules and regulations regarding safety for the given place of work.

Members of the public must never be permitted access to the SA380-IT.

1.5) Handling Hazards

The following precautions must be taken during storage and transportation:

  • Protection from prolonged rainfall.
  • Protection from immersion in water.
  • Ensure that the storage temperature is not exceeded.
  • Protection against crushing.

Damaged enclosures can expose hazardous voltages and nullifies the SA380-IT Ingress-Protection.

Prolonged exposure to, or immersion in water exceeds the SA380-IT Ingress-Protection rating. Under such conditions dielectric withstand voltages cannot be guaranteed.

Never install or energise an SA380-IT that appears to be either physically damaged or suffering from water ingress.

1.6) Safe Installation

Detailed wiring instructions can be found in section 3. The purpose of this section is to reinforce critical safety information.

Never connect the SA380-IT directly to monitored circuits without:

  • Using the approved resistive cable (MPEC part No. SA380-IT-RC).
  • Connecting via the BX HI Z and NX HI Z terminals.


Never attempt to "common together" any conductors from differing monitored circuits.

Never attempt to wire any conductors from differing monitored circuits into the same input channel.

Always check the voltage of the monitored and supply circuits:

  • Check each monitored or supply circuit does not exceed the specified maximum system voltage (160V RMS AC/DC).
  • Ensure wiring of monitored or supply circuits is performed such that the cabling is not "live" until installation is complete.

Attempting any of the above poses a risk of:

  • Circumvention if the inter-isolation of monitored circuits.
  • Short circuit of individual monitored circuits.
  • Electric shock.

The Functional Earth and Loop Earth must be connected to suitable earthing points using separate wires.

  • It is acceptable to use a common earthing point if provision of a secondary earthing point is prohibitive.
  • It is not acceptable to simply strap Functional Earth to Loop Earth.

An ineffective Earth Loop circuit is unable to verify correct connection of the SA380-IT, hence insulation readings may be incorrect.

Only one insulation monitoring device may be used on a single interconnected circuit. Installation of additional monitoring devices will cause each device to "fight" the other, resulting in incorrect readings on both devices.

Check that the factory set earth loop and insulation resistance alarm levels are correct for your application. (See section 4.4.10)


The Ethernet port is sensitive to electrical surges:

  • Additional surge protection must be fitted if the port is to be used continuously for data transmission.
  • Surge protection is not required for temporary configuration and diagnostics activities.

The SA380-IT is intended be powered from an AC circuit, however the device will operate when powered from a DC circuit with appropriate voltage. This does not affect isolation levels or conducted emissions and is not a hazard, however this is not permitted in UK railway signalling systems.

Users in other countries may disregard this warning.

Ensure that you have exhausted all fault finding tasks prior to manually resetting any device interlock (see section 5.2 and section 4.4.5).

It is wise to conduct a manual insulation test on monitored circuits both prior to, and after installation, but before energising the SA380-IT. This will help verify correct installation of the measurement circuit wiring.

A manual continuity test between Functional Earth and Loop Earth connections after installation, but before energising SA380-IT will help verify correct installation of the earth-loop circuit wiring.

When conducting manual insulation testing on monitored circuits after commissioning, the SA380-IT must be either:

  • Prevented from attempting measurement (see section 4.4.5).
  • Physically disconnected from the monitored circuit.
  • Powered-down.

Failure to do so will result in incorrect readings.

 


2) General

2.1) Product Description

The SA380-IT is designed to facilitate the continuous monitoring of resistance to earth of up to 5 independent circuits.

The SA380-IT has built-in communications hardware in the form of a GSM modem and features Ethernet connectivity. This allows the SA380-IT to connect to cloud-based Enterprise Asset Management Systems (EAMS).

Maintenance Reduction and Failure prevention are best realised through continuous monitoring. It facilitates:

  • The removal of the requirement for time-consuming and dangerous physical inspection and measurement.
  • The ability to predict, schedule and fix developing earth faults before they become an operational risk.

Key Features:

  • Independent monitoring of up to 5 circuits, each circuit can be one of the following systems:

    • Single phase IT AC system up to 160 V RMS.
    • Single phase IT AC system up to 160 V RMS with galvanically connected rectifiers.
    • IT DC system up to 160 V RMS. 

  • Equivalent resistance to earth measurement of AC circuits.
  • Resistance to earth measurement of each circuit leg of DC circuits.
  • Automatic adaptation to system leakage capacitance.
  • Sub 1 second rapid response time.
  • Adjustable response values.
  • Monitored circuits supply voltage measurement.
  • Earth-loop continuity measurement.
  • Continual self-test for accuracy and safety.
  • Volt-free contact alarm output.
  • Auxiliary power supply output.
  • In-built GSM communication.
  • In-built Ethernet communication.
  • In-built RS485 communication.
  • Compatible with leading enterprise asset management systems.

The SA380-IT has the ability to monitor and continuously report the following parameters:

  • For each monitored circuit:
    • System voltage.
    • For DC circuits, resistance to earth of individual circuit legs, Rand RN.
    • For AC circuits, equivalent resistance to earth (RL) is measured. This is Rand RN in parallel.
    • Resistance to earth alert status (resistance below pre-set threshold).

  • For each SA380-IT device:
    • Loop resistance between functional earth and loop earth terminals.
    • Earth Loop fault status.
    • Hardware fault status.

2.2) Principles of Operation

Monitored circuits remain galvanically isolated from one another at all times. Monitored circuits are only connected to measurement circuitry and earth during measurement.

Periodic monitoring of the hardware and earth connection assures safe and reliable operation.

Inside the SA380-IT there is only one single instance of "measurement circuitry", however there are five instances of the "monitored circuit" circuitry (switches and protection resistors).

Simplified voltage and resistance to earth measurement circuitry for one monitored circuit.

Simplified Circuit Diagram

  • Us = Monitored circuit voltage.
  • B = B leg circuit connection.
  • N = N leg circuit connection.
  • FE = Functional earth circuit connection.
  • V = Internal voltmeter.
  • Vm = Measurement pulse voltage.
  • im = Resistance to earth ammeter.
  • RB = Resistance to earth (B leg).
  • RN = Resistance to earth (N leg).
  • CB = System leakage capacitance (B leg).
  • CN = System leakage capacitance (N leg).
  • An independent solid-state switch exists for each monitored circuit.
  • Independent internal protection resistors (94 kΩ) exist for each monitored circuit.
  • Independent resistive cables (47 kΩ) are provided for connection of each monitored circuit.

The modes of operation, and measurement principals of the SA380-IT are described in the following sections.

2.3) Modes of Operation

2.3.1 Normal Mode

Each monitored circuit (configured for measurement) is evaluated in turn, in a loop:

  • The monitored circuit is connected to the internal measurement circuitry and earth using a solid-state switch.
  • Voltage measurement is performed. (see 2.4)
  • If the voltage is in range, resistance to earth measurement is performed. (see 2.5)
  • The monitored circuit is disconnected from the internal measurement circuitry and earth.

the procedure is repeated for the next monitored circuit, and so on.

Every 30 seconds system integrity checks are performed:

  • Solid state switches are confirmed to be in the "open" state (all monitored circuits galvanically disconnected from each other, measurement circuitry and earth).
  • The SA380-IT remains within its defined accuracy parameters (performs an internal calibration check).
  • Earth-loop resistance has not exceeded the alarm limit (resulting in inaccurate resistance to earth measurements).

2.3.2 Technicians Mode

For "on-site" use to aid a technician in locating and remedying monitored circuit faults. (see 4.4.3)

  • Forces the SA380-IT to make repeated measurements of a single monitored circuit.
  • Response time is increased as only the monitored circuit of interested is measured.
  • A large and clear read-out of measured values is reported to the technicians iPhone or computer display.
  • The technician can quickly verify if their actions are having the desired effect upon the monitored circuit.
  • Technicians mode can be cleared manually by the user at any time.
  • Technicians mode will automatically clear after a period of 4 hours, and the SA380-IT will resume "Normal mode".
  • Earth Loop resistance measurement and system safety tests are not performed whilst in technicians mode.

2.3.3 Suspended Mode

The user may suspend monitored circuit measurement to enable fault finding activities to take place. (See section 4.4.5). This prevents the SA380-IT injecting a measurement pulse, or presenting resistances to earth across the monitored circuits.

  • During suspended mode, all monitored circuits remain galvanically isolated from each other, all internal measurement circuitry and earth.
  • Suspended mode can be cleared manually by the user at any time.
  • Suspended mode will automatically clear after a period of 4 hours, and the SA380-IT will resume "Normal mode".
  • Earth Loop resistance measurement and system safety tests are not performed whilst in suspended mode.

2.3.4 Degraded Modes

There are instances when the SA380-IT may suspend some, or all measurements. Degraded modes are applicable in normal and technicians mode and are often due to the activation of device safety interlocks. See section 5.2 for more information.

Scenario

Voltage Measurement

of Monitored Circuits

Resistance to Earth Measurement

of Monitored Circuits

Earth Loop &

Safety Tests

Device bootNoNoNo
Time not setNoNoNo
Earth loop resistance out of toleranceNoNoYes
Monitored circuit under voltageYes

No - Affected Circuits

Yes - Unaffected Circuits

Yes
Monitored circuit over voltage

No - Affected Circuits

Yes - Unaffected Circuits

No - Affected Circuits

Yes - Unaffected Circuits

Yes
Solid state switch faultNoNoNo
Calibration test failureNoNoNo

2.4) System Voltage Measurement

Voltage is measured across the monitored circuit terminals after the monitored circuit is connected to the measurement circuitry, but prior to resistance to earth measurement.

  • If the circuit is configured for AC measurement, the RMS value of the voltage is calculated.
  • If the circuit is configured for DC measurement, the mean value of the voltage is calculated.

A voltage reading of less than 7V is regarded as an under-voltage. Resistance to Earth will not be measured until the under-voltage is removed.

A voltage reading of more than 1.4 times the configured nominal voltage is regarded as an over-voltage (for example, a reading of >=75 V on a circuit configured as 70 V). Such an event could be caused by hardware failure, as such, no further measurements will be performed upon this circuit until the safety interlock is cleared (see section 5.2)

2.5) Resistance to Earth Measurement

Only if the monitored circuits voltage measurement is within tolerable parameters will a resistance to earth measurement be attempted. This is to ensure safe and reliable operation of the monitored circuit.

The SA380-IT utilises the "pulse test" method of resistance to earth measurement. A series of current limited rectangular pulses are injected into the monitored circuit. This will cause a current to flow through any resistance and capacitance to earth.

Any capacitance to earth will eventually become fully charged by the test signal. once this occurs, a current measurement can be taken in the steady state. The combined values of capacitance and resistance to earth will govern measurement time.


Equivalent Circuit for Measurement Pulse signal

  • RL = Equivalent Resistance to Earth (RB in parallel with RN).
  • CE = System Leakage Capacitance (CB in parallel with CN).
  • iVm = Ammeter current solely due to measurement pulse voltage.

The graph below shows the application of measurement pulses, the transient charging current through the system capacitance and the eventual steady state condition:

Typical response to measurement pulses

The SA380-IT configurable "measurement timeout" parameter places a limit on how long the device will wait for the steady state to be achieved prior to taking a measurement. This time may be exceeded if:

  • The system capacitance and resistance are too high.
  • Transient signals present in the measurement loop prevent a steady state being achieved.

Transient signals may be due to sudden monitored circuit voltage variation, or transient resistance to earth events.

When a time-out occurs, the SA380-IT will attempt measurement at the point of the time-out. Such readings may suffer from reduced accuracy, the reported value will always be a lower resistance to earth than that actually present.

It is up to the user to specify an appropriate time-out value, based upon the trade-off between desired accuracy and speed of measurement.

The equation for calculating measurement time per circuit is: (750,000 x CE) + 0.3 seconds. Where Cis the maximum expected capacitance to earth of the monitored circuit. The factory default is set at C= 1 μF.

The Resistance to earth of each circuit leg can cause current flow from the monitored circuits supply Us, through SA380-IT measurement circuitry. For DC sources, such a current will always appear to flow in the same "direction" through the measurement circuit, regardless of measurement pulse polarity.

The equivalent circuit and associated current trace are shown below:


iUs = Ammeter current solely due to monitored circuit voltage "bleed through" in a DC circuit.

The net current flow measured by the internal ammeter is the sum of the current produced by the test pulse voltage and the current caused by the monitored circuit voltage "bleeding through" the SA380-IT.

The graph below shows a typical measurement current trace of the SA380-IT:


By applying a test pulse of alternating polarity, the test pulse current becomes a "differential" current reading, whilst the current due to the supply circuit becomes a "common" current reading.

By taking the difference of the measured current for the positive and negative measurement pulse signals, the "common" current is eliminated allowing the calculation of equivalent resistance to earth (RL).

By taking the sum of the measured current for the positive and negative measurement pulse signals, the "differential" current is eliminated. In the case of DC circuits, this allows the direct calculation of the resistance of each circuit leg RB and RN.

Please note:

  • When RB > 10 x RN. Then the accuracy of RB will exceed +/-5%
  • When RN > 10 x RB. Then the accuracy of RN will exceed +/-5%

This is due to it becoming increasingly difficult to measure a large resistance to earth in one leg of a circuit, when the resistance to earth in the other leg of the circuit becomes relatively small.

In addition to the above methods, the SA380-IT applies proprietary signal conditioning algorithms to improve measurement accuracy under transient conditions, such as:

  • Unstable monitored circuit voltage.

  • Dynamic resistance to earth changes.

  • Transient events on monitored circuits. 

2.6) Earth Integrity Measurement

Every 30 seconds the integrity of the SA380-IT functional earth connection is validated by measuring the resistance between the primary (Functional Earth) and secondary (Loop Earth) earth connections.

This gives confidence that the earth connection is "good" and therefore reliable Resistance to Earth measurement of monitored circuits can be conducted.

  • In the case where two wholly independent earth points have been provided (1), it verifies that the functional earth connection is intact, and that connection to the physical mass of the earth is also of sufficiently low resistance.
  • In the case where two independent wires have been run to a common earth point, (2) it verifies that the wiring of the functional earth connection is intact.

Single & Double Earth Points:

The Resistance of the earth loop is measured in a manner very similar to "Resistance to Earth of Monitored Circuits".

Equivalent Circuit for Earth Loop Measurement:

  • Ip = Measurement Pulse Current.
  • Loop Earth = Loop Earth terminal.
  • FE = Functional Earth circuit terminal.
  • Vm = Measured Voltage (High Impedance).
  • Rearth = Earth Loop Resistance.
  • Ustray = Voltage due to stray Earth Currents.

Measurement Procedure:

  • When the Earth Loop Resistance is not being measured, the current source is disconnected from the measurement circuit.
  • When measuring Earth Loop Resistance, a "pulse test" method of earth loop resistance measurement is employed.
  • A series of constant-current, rectangular pulses are injected into the monitored circuit. This will cause a constant current to flow through any resistance in the earth loop path.
  • The constant current generates a voltage across the earth loop resistance. It is this voltage that is acquired by the measurement circuitry. Voltage is limited to 3.5 V in the open circuit case.
  • Unwanted voltage will also be picked up by the measurement circuitry due to stray ground currents flowing in the earth loop.
  • Unwanted stray AC components above 3.5Hz are removed using digital filtering techniques.
  • The unwanted stray DC component is removed through the use of a bi-directional current source, similar to resistance to earth measurement, the constant measurement pulse presents as a differential signal across the measuring element, whilst the stray DC current appears as a common signal across the measuring element.
  • Measurement takes approximately 300 milliseconds.

 

By taking the difference of the measured voltage for the positive and negative measurement pulse signals, the "common" current is eliminated allowing the calculation of Earth Loop Resistance (Rearth)

2.7) Hardware Self-Test

Hardware self-test is undertaken every 30 seconds. The SA380-IT will report a hardware-fault when the following conditions occur:

  • The SA380-IT is unable to make reliable measurements of insulation resistance.
  • The SA380-IT has detected an internal fault that could impact upon the safety or reliability of the monitored system.

The SA380-IT response to these scenarios is as follows:

  • Indicate to the cloud based supervisory system that a hardware fault has occurred.
  • Illuminate the HW FAULT light.
  • Open the volt-free contact output.
  • Disable the faulty hardware. (Device Interlock)

These "device interlocks" will prevent further measurements being conducted.

2.8) Alert Conditions

The SA380-IT raises alerts under the following scenarios:

Scenario

Self-Clearing ?

Locks Out:

Lights HW Fault Lamp?

Lights Earth Fault Lamp?

Opens Volt-Free Contact?

Under VoltageYesChannelNoNoNo
Over VoltageNoChannelYesNoYes
Calibration test failureNoDeviceYesNoYes
Solid state switch faultNoDevice

Yes

NoYes
Earth loop Resistance above Alert Threshold

Yes

5% Hysteresis

Device

Yes

NoYes
Resistance to Earth below Alert Threshold

Yes

5% Hysteresis

N/ANoYesYes

2.8.1 Hysteresis:

Hysteresis is employed to prevent "chattering" alerts:

  • When the resistance to earth of a monitored circuit drops below the configured alert threshold the SA380-IT will enter the earth fault state.
  • E.g. if the alert threshold is 100 kΩ, an "earth fault" will be flagged as soon as resistance to earth drops below 100 kΩ on any monitored circuit.
  • The earth fault will remain until the resistance to earth of a monitored circuit exceeds the configured alert threshold +5%.
  • E.g. the earth fault would not "clear" until the resistance to earth exceeds 105 kΩ on all monitored circuits.
  • When the earth loop resistance exceeds the configured alert threshold the SA380-IT will enter the hardware fault state.
  • E.g. if the alert threshold is 1 kΩ, a "hardware fault" will be flagged as soon as earth loop resistance exceeds 1 kΩ.
  • The hardware fault will remain until the earth loop resistance drops below configured alert threshold -5%.
  • E.g. the hardware fault would not "clear" until the earth loop resistance falls below 950 Ω.

2.8.2 Minimum Operation Time

If any fault condition causes the volt-free contact to open, it shall remain open for a minimum period of 2 seconds to prevent the risk of transient events being missed.

2.9) Communications & Peripheral Outputs

2.9.1 Fault Indication (Volt-Free-Contact)

The SA380-IT features a volt-free contact (relay) output. This can be utilised to:

  • Indicate fault conditions to external alarm circuits
  • Connect to external data-logging equipment.

The latter is particularly useful, as additional event data from the data logging device can be used to cross-check which sub-elements of a monitored circuit are active in the event of transient earth faults.

Fault contact openFault contact closed
SA380-IT powered downSA380-IT powered and fault free
Hardware fault 
Earth fault 

2.9.2 Auxiliary Power Supply

A external power supply is provided to power external sensors or equipment. The specification is:

  • 5 Volts
  • 1 Watt
  • Galvanically isolated from all other circuits except for RS485.

2.9.3 Serial RS485 Data Port

A serial RS485 port is provided to allow serial data communications between the SA380-IT and another device.

These features are yet to be implemented in software, but are envisioned to facilitate the following:

  • Connection to MPEC SA380TX data loggers
  • Connection to smaller down-stream earth continuity or earth leakage testers and sensors.

2.9.4 GSM & Ethernet Connection

The SA380-IT features an internal GPRS modem with factory fitted SIM, and an Ethernet controller. Configuration of the SA380-IT and reporting of data is possible using both interfaces.

Both communication bearers allows continuous reporting of all measured values to an Enterprise Asset Management System (EAMS).

Enterprise asset management systems can be be utilised to monitor long term asset trends and forewarn of asset failure. Presently two such systems are supported:

ProductVendorWeb-Link
CentrixMPECCentrix Documentation
Network Rail Intelligent InfrastructureNetwork Rail / Thaleshttp://www.networkrailconsulting.com/service/remote-condition-monitoring

Operation and configuration of these Enterprise asset management systems is beyond the scope of this user guide.

On-site configuration via Apple devices, such as iPhone or iPad, is supported via a "Lightning to Ethernet" cable connected between Apple device and SA380-IT.

A custom App named "SA380-IT" is available from the Apple AppStore that supports this cable. (See section 4.3.1 for details).

Configuration and interrogation is explored in depth in section 4.4.

The Lightning to Ethernet Cable (MPEC part number SA380-IT-LE) is sold as a separate accessory and is not normally included with the device (see section 6.3).

2.10) Data Acquisition

The SA380-IT processes data before display to the user and transmission to an Enterprise Asset Management System. (EAMS)

The following quantities are sampled and sent back to the EAMS:

NameQuantity:Units:Notes
Monitored Circuit VoltageUmVReported for all five circuits
Resistance to Earth (Negative Leg)RNReported for all five circuits
Resistance to Earth (Positive Leg)RBReported for all five circuits
Earth Loop ResistanceREΩ 
Unit StatusStatusNACollection of binary status information (see table below)
TemperatureTempoCInternal temperature
Up-TimeTimeminutesPeriod of time since last restart
Signal StrengthGSM SignaldBGSM modem signal strength

Note that for AC monitored circuits, RB = RL and RN = RL.

 

The status message is a 16-bit integer. with '0' being false, and '1' being true. Each bit has the following meaning:

BitMeaning
0Calibration Fault
1Internal Hardware Fault
2Calibration or Hardware Fault; or device in suspended mode
3Earth Loop Fault
4Any Monitored Circuit has an Over voltage
5Not used
6Volt Free Contact State (0 closed, 1 open)
7 Not used
8 Not used
9 Not used
10Internal Monitored Circuit Fault
11Monitored Circuit 1 Fault
12Monitored Circuit 2 Fault
13Monitored Circuit 3 Fault
14Monitored Circuit 4 Fault
15Monitored Circuit 5 Fault

2.10.1 Protocol Selection

Two transmission  protocols can be selected for sending data to an EAMS:

MIMOSA

    • Text based protocol compatible with the Network Rail Intelligent Infrastructure and MPEC Centrix systems.
    • Plain text, human-readable, but large data messages.
    • Lengthy back-off periods (up to 2 hours) in the event of loss of communications.
    • Does not support engineering units.

RailDAQ

    • Binary protocol compatible with the MPEC Centrix system.
    • Small, but unreadable binary messages (more than 10 times smaller than MIMOSA).
    • Minimal back-off periods (a few seconds) in the event of loss of communications.
    • Message size and back-off policy offer significant reliability improvements over MIMOSA.
    • Supports engineering units.

2.10.2 The Rules of Acquisition

Rounding and Truncation

After performing a measurement, the software will round and cap all data to make it simpler to interpret.

 Quantity:Rounding:Capping:
Monitored Circuit VoltageUmto the nearest 1 V160 V
Resistance to EarthRB RNdown to the nearest 1 kΩ5 MΩ
Earth Loop ResistanceREto the nearest 0.5 Ω1 kΩ

It is the rounded and capped data is displayed on the web based user interface.

Sampling

Data is not continuously sampled and sent the EAMS as this would produce a vast amount of data.

The SA380-IT employs a sampling scheme that rationalises the amount of data buffered for transmission by employing the following sampling rules.

StateUMRNRBREStatusTempTimeGSM SignalNotesFactory Default Setting
At start-up
    • all circuits
    • all circuits
    • all circuits
    •  
    •  
    •  
    •  
    •  
Sample acquired as soon as time is setNA
snapshot time elapsed since last acquisition
    • all circuits
    • all circuits
    • all circuits
    •  
    •  
    •  
    •  
    •  

snapshot time is configurable.

The snapshot timer runs "per channel"

1 hour
User clears "comms queue"
    • all circuits
    • all circuits
    • all circuits
    •  
    •  
    •  
    •  
    •  
 NA
% change in Um
    • affected circuit only
    • affected circuit only
    • affected circuit only
     % change is configurable5%
% change in RL
    • affected circuit only
    • affected circuit only
    • affected circuit only
     % change is configurable5%
% change in the lower value of RB and RN
    • affected circuit only
    • affected circuit only
    • affected circuit only
     % change is configurable5%
% change in RE   
    •  
    •  
   % change in RE is configurable5%
Any change is Status   
    •  
    •  
    NA

% Change:

A % change acquisition is made when the last measurement made by the hardware differs by more than n% from the reading at the time of the last acquisition.

For example, if at start up. a value of RN = 100 kΩ, and the change threshold is set to 5%, then a % change acquisition will not be take place until a reading <= 95 kΩ, or >= 105 kΩ is made.

Delayed acquisition:

60 seconds after any of the above acquisitions takes place, a further delayed acquisition is made to ensure that the EAMS knows that the readings are stable and representative.

The 60 second time-out period is user configurable.

2.10.3 Buffering

Queue

Every time an acquisition takes place, if is placed in a first-in, first-out (FIFO) message queue. This message queue resides in non-volatile memory and will not be erased when the SA380-IT powers-down.

The SA380-IT will attempt to empty this queue whenever a successful connection to an EAMS exists.

    • When the queue becomes full, the oldest entries are over-written.
    • The user can empty the queue at any time.
    • The queue has enough room for approximately 130,000 acquisitions.  This is at least 1.5 days of data at absolute maximum acquisition rates, or 9 months of data at a stable installation. Your mileage may vary.

Batching

When using MIMOSA communication the SA380-IT will hold-off the transmission of data until one of the following conditions becomes true.

    • >= 1024 entries are pending in the queue.
    • >=60 seconds has elapsed since a message was last transmitted.

This is to economise transmission bandwidth and server resources.

2.10.4 Examples

The diagram below shows examples of each type of acquisition:

In all cases two acquisitions take place for each event, the initial triggered acquisition, and the subsequent delayed acquisition 60 seconds later.

ItemDescription
1Acquisition on all channels due to device start-up
2Acquisition on all channels due to user clearing the message queue
3Acquisition of Um, RN and RB due to a change in Um of >+/-5% since the last acquisition of Um
4Acquisition of Um, RN and RB due to a change in RL of >+/-5% since the last acquisition of RN and RB
5Acquisition of Um, RN and RB due to a change in RN (The lower of RN & RB) of >+/-5% since the last acquisition of RN and RB
6Acquisition of RE and Status due to a change in RE of >+/-5% since the last acquisition of RE
7Acquisition of RE and Status due to a change in Status since the last acquisition of Status
8Acquisition of Up-Time, Temp and GSM Signal due to a period of 1 hour elapsing since their last acquisition (snapshot)
9Acquisition of Um, RN and RB due to a period of 1 hour elapsing since their last acquisition (snapshot)

 


3) Installation

3.1) Overview

Before commencing installation please consider the following:

It is wise to conduct a manual insulation test on the monitored circuits both prior to, and after installation, but before energising the SA380-IT. This will help verify correct installation of the measurement circuit wiring.

A manual continuity test between Functional Earth and Loop Earth connections after installation, but before energising SA380-IT will help verify correct installation of the earth-loop circuit wiring.

Check all fuses / links are removed at the system termination point for each monitored circuit and the SA380-IT power supply prior to installation. Test all wiring before re-inserting any fuses / links.

Only one insulation monitoring device may be used on a single interconnected circuit. Installation of additional monitoring devices will cause each device to "fight" the other, resulting in incorrect readings on both devices.

The SA380-IT back panel is reproduced below showing the connector layout:

The principal connections are as follows:

No.NameDescription
1SupplyPower supply to the SA380-IT
2Functional EarthCommon Earth point for all device measurement
3Loop EarthSecondary Earth point for earth continuity measurement
4Monitored CircuitsThe IT circuits that require insulation monitoring
5HiZ OutputsA means of safely monitoring the insulation of the supply circuit.
6Auxiliary OutputsI/O to other devices and alarm circuits
7GSM AntennaFacilitates GSM connection to an Enterprise Asset Management System
8Ethernet JackAllows local configuration and diagnostics, or Ethernet connection to an Enterprise Asset Management System
9Fixing StudM5 mounting studs to fit BR930 / Q Style relay mountings. Brackets are available to allow alternate mounting arrangements

"Typical circuits" to Network Rail standards show the wiring arrangement of a typical installation.

3.2) Physical Installation

The following precautions must be taken during storage and transportation:

  • Protection from prolonged rainfall.
  • Protection from immersion in water.
  • Ensure that the storage temperature is not exceeded.
  • Protection against crushing

Damaged enclosures can expose hazardous voltages and nullifies the SA380-IT Ingress-Protection.

Prolonged exposure to, or immersion in water exceeds the SA380-IT Ingress-Protection rating. Under such conditions dielectric withstand voltages cannot be guaranteed.

Never install or energise an SA380-IT that appears to be either physically damaged or suffering from water ingress.

The SA380-IT is designed to be fitted to BR930 / Q Style relay bar. Alternative mounting arrangements can be made using the hinged bracket (MPEC part no: BRK-HINGE)

Tool / Parts Required:

  • M5 (8 mm) nut spinner

Actions:

  • Install onto BR930 / Q Style relay racking. Feed the mounting studs through the pre-drilled holes on the mounting bar and secure with the supplied spring washer and M5 nut. Take care not to over-tighten.

  • Alternatively install using the MPEC hinged bracket:
    • Orientate the bracket such that he hinge faces the desired side.
    • Affix the hinged bracket in the desired location using appropriate fixings (not supplied) through the pre-drilled holes at the rear of the hinged bracket.
    • Feed the mounting studs of the SA380-IT through the pre-drilled holes at the front of hinged bracket and secure with the supplied spring washer and M5 nut. Take care not to over-tighten.
    • Lock the hinge of the bracket in place by tightening the M5 hinge nuts.

Test:

  • Attempt to rock the device from the front of the enclosure. Check that the device is secure.

3.3) Termination of Wiring

It is recommended that terminations into the SA380-IT are made using ferules. Termination of cables onto monitored circuits and power supplies etc. is beyond the scope of this user manual.

Tools / Parts Required:

Actions:

  • For 0.75 mm2 wire, use the crimp tool to affix a shrouded ferrule to the cable end.
  • For 1.50 mm2 wire, use the crimp tool to affix a un-shrouded ferrule to the cable end.
  • To insert a cable, push-home the ferrule into the spring-clamp plug.
  • To remove a cable, release the spring clamp using a small flat bladed screw driver prior to withdrawing the cable.

Wire insertion (Left) and removal (right)

Test:

  • Inspect that no copper strands are visible in the completed termination
  • Apply a sharp pull on the wire to ensure that the wire is properly gripped.

3.4) Connection of SA380-IT Supply

The SA380-IT requires an AC supply at the "BX" and "NX" supply terminals to operate.

The SA380-IT is intended be powered from an AC circuit, however the device will operate when powered from a DC circuit with appropriate voltage. This is not permitted in UK railway signalling systems.

Tools / Parts Required:

  • Ferrules
  • Crimp Tool
  • 2A (minimum) fuse

Actions:

  • Connect the power supply to the SA380-IT as shown:

  • Do not use "resistive cable" for these terminations.
  • Network Rail users must use "Grey 0.75 mm A1" cable (supplied with the device) for these terminations.
  • A 2A fuse should be fitted in the "BX" leg of the supply.
  • Do not apply power to the device until all wiring is complete.

Test:

  • Test that the voltage of the circuit intended to power the SA380-IT is within 50 V to 160 V AC prior to connection.
  • Continuity test the "BX" wire end-to-end. The spring-contact plug of the SA380-IT features a test-point.
  • Continuity test the "NX" wire end-to-end. The spring-contact plug of the SA380-IT features a test-point.

3.5) Connection of Earth

The SA380-IT has two earth termination points. Both must be correctly installed for the device to function. See section 2 for a full description of the function of SA380-IT earth terminals.

Tools / Parts Required:

  • Ferrules
  • Crimp Tool

Actions:

  • FE, or "Functional Earth" is the "master" earth point. 

FE must bonded to a main earthing point of the monitored electrical installation using as short and direct a cable run as possible

  • "Loop Earth" is used for performing earth-loop-continuity measurement.
  • The preferred method of installation is to bond "loop-earth" to a second earth bonding point, connected to the physical mass of the earth and independent of the "FE" connection.
  • In this instance, the earth-loop-continuity test is checking the integrity of the cabling between SA380-IT to earth bonds, and the integrity of the earth bonds to the mass of the earth.
  • Such a connection is shown on the left in the diagram below.
  • Where it is prohibitive to install and independent secondary earth bonding point, it may be deemed tolerable to wire the "Loop Earth" the same earth bonding point as "FE". The Loop Earth bond must be independent to the FE bond.
  • In this instance, the earth-loop-continuity test is only checking the integrity of the cabling between SA380-IT to earth bond, and not the integrity of the earth bond to the mass of the earth.
  • Such a connection is shown in the middle of the diagram below:

In all cases Loop Earth must bonded to an earthing point of the monitored electrical installation using as short and direct a cable run as possible.

Never connect Loop Earth to FE via a short strap connection at the rear of the unit as this will not prove the integrity of the cabling between SA380-IT to earth bond, nor the integrity of the earth bond to the mass of the earth.

An ineffective Earth Loop circuit is unable to verify correct connection of the SA380-IT, hence insulation readings may be incorrect.

  • Do not use "resistive cable" for these terminations.
  • Network Rail users must use "Yellow/Green 1.50 mm A1" cable (not supplied with the device) for these terminations.

Test:

  • Continuity test the earth loop between "FE"  and "Loop Earth" connections. The spring-contact plug of the SA380-IT features a test-point.
  • If using independent earth points, continuity test FE and Loop Earth separately as testing the loop resistance with a multi-meter may give erroneous results. (FE to primary bond, then Loop-Earth to secondary bond). 

3.6) Connection of Monitored Circuits

There are two means of connecting monitored circuits to the SA380-IT. Via resistive cables, or via the HiZ outputs:

3.6.1 Via Resistive Cables

This is the standard method of connection to monitored circuits

The SA380-IT device is typically supplied with resistive cables, or they can be purchased separately (see 6.3). The resistive cable features a 47 kΩ series resistor fitted 100 mm from one end of the cable.

The purpose of the resistive cables are to limit current flow between monitored circuits in the event that any SA380-IT cabling inadvertently comes into contact with any other safety critical or high reliability circuits.

The preferred termination method is to situate the in-line resistor at the "monitored circuit end" of the termination to protect against cable insulation fault, however this is at the discretion of the user.

If resistive cables are not fitted, incorrect readings will be obtained.

3.6.2 Via HI Z Outputs

It is common to perform monitored circuit functions on the same circuit that is used to power the SA380-IT device.

To simplify wiring it is possible to "jumper" across the power supply into "Channel 1" of the monitored circuits. This is achieved by the "HI Z" outputs.

The "HI Z" outputs present the power supply voltage as an output, albeit with a 47 kΩ resistor in each circuit leg. E.g.

  • BX HI Z is BX Supply with 47 kΩ in series.
  • NX HI Z is NX Supply with 47 kΩ in series.

This means that resistive cables are not required to jumper the HI Z outputs across to channel 1 as shown in the diagram below.

Network Rail users must use "Grey 0.75 mm A1" cable (supplied with the device) for these terminations.

Tools / Parts Required:

  • Ferrules
  • Crimp Tool
  • Resistive Cables (MPEC Part No. SA380-IT-RC)

Actions when using Resistive Cable:

  • Each monitored circuit can be AC or DC and range from 5 V to 160 V RMS.
  • Where possible, disconnect the voltage at the positive and negative termination point on the monitored circuits bus-bar.
  • Connect the end of the cable with the resistor fitted to the positive or "B leg" of the monitored circuit.
  • Connect the far end of the cable to the appropriate "B leg" connection at the rear of the SA380-IT.
  • Connect the end of the cable with the resistor fitted to the negative or "N leg" of the monitored circuit.
  • Connect the far end of the cable to the appropriate "N leg" connection at the rear of the SA380-IT.
  • The cables should be shortened at the SA380-IT end if possible.

Actions when using HiZ Outputs:

  • Connect "BX HI Z" to "B1" with standard cable (Do not use resistive cable).
  • Connect "NX HI Z" to "N1" with standard cable (Do not use resistive cable).

Never connect the SA380-IT directly to monitored circuits without:

  • Using the approved resistive cable (MPEC part No. SA380-IT-RC).
  • Connecting via the BX HiZ and NX HiZ terminals.


Never attempt to "common together" any conductors from differing monitored circuits.

Never attempt to wire any conductors from differing monitored circuits into the same input channel.


Always check the voltage of the monitored and supply circuits:

  • Check each monitored or supply circuit does not exceed the specified maximum system voltage (160V RMS AC/DC)
  • Ensure wiring of monitored or supply circuits is performed such that the cabling is not "live" until installation is complete.

Attempting any of the above poses a risk of:

  • Circumvention if the inter-isolation of monitored circuits.
  • Short circuit of individual monitored circuits.
  • Electric shock.

Tests when using Resistive Cable:

  • Test that the voltage of the monitored circuit is of the expected value and type (AC or DC).
  • Perform an earth test on the monitored circuit prior to commissioning.
  • Test the "B" wire end-to-end. The resistance must read 47 kΩ +/-0.1 %. The spring-contact plug of the SA380-IT features a test-point. 
  • Test the "N" wire end-to-end. The resistance must read 47 kΩ +/-0.1 %. The spring-contact plug of the SA380-IT features a test-point. 

Tests when using HI Z Outputs:

  • Continuity test "BX HI Z" to "B1". The spring-contact plug of the SA380-IT features a test-point.
  • Continuity test "NX HI Z" to "N1". The spring-contact plug of the SA380-IT features a test-point.

3.7) Connection of Peripheral Equipment

3.7.1 GSM

The SA380-IT device can be shipped with factory fitted SIM and GSM antenna.

Please liaise with MPEC to specify your desired SIM package

Tools / Parts Required:

  • Drill with appropriate 12 mm bit maybe required.

Actions:

  • In railway settings the antenna must be fitted to the outside of the equipment enclosure (typically a location case or REB)
  • Affix the antenna head to the exterior of the equipment housing using the self-adhesive backing and back-nut. (Panel Mount)
  • This may require drilling a 12 mm hole.
  • For non-panel mount scenarios, additional brackets may be required. These are not supplied with the SA380-IT.
  • Affix the antenna tail cable using the SMA screw-fit connector to the rear of the logger - do not over tighten.
  • Do not attempt to shorten the cable without appropriate specialist tools.
  • Do not force the antenna cable around tight bends.

Antenna placement tips

The radiation pattern of the supplied antenna is a torus (doughnut) about the horizontal plane.

There is zero reception directly above or below the antenna, there is maximal and even reception around the horizontal plane.

Test:

  • The GSM connection status of the logger can be casually observed using the SA380-IT status indications. (See section 4.2)
  • In-depth status information can be observed using the web-based configuration and diagnostics application (see section 4.4.4)

3.7.2 Ethernet

The Ethernet is sensitive to electrical surges:

  • Additional surge protection must be fitted if the port is to be used in a continuously.
  • Surge protection is not required for temporary configuration and diagnostics activities.

Tools / Parts Required:

  • None

Actions:

  • The Ethernet port accepts standard Ethernet cable via an RJ45 connector.
  • The Ethernet port can be used as a monitoring port with no additional protection required.
    • If connecting direct to a computer, simply use an Ethernet patch cable to connect devices point to point.
    • If connecting to an Apple iPad of iPhone you must use the MPEC "Lightning to Ethernet" cable (MPEC Part No. SA380-IT-LE) and have the SA380-IT "App" installation (available on the App-store).
  • If using the Ethernet port as a permanent data connection then an additional lightning arrestor device rated to 2 kV line-to-earth must be provided between SA380-IT and local switch.

Test 

  • Successful connection can be verified by checking that the LAN port Link indication is lit solid, and the the activity indication is blinking.
  • The connection status of the logger can be casually observed using the SA380-IT status indications. (See section 4.2)
  • In-depth status information can be observed using the web-based configuration and diagnostics application. (see section 4.4.4)

3.7.3 Volt-Free Contact (VFC)

The VFC is used to give a local indication of hardware or earth fault.

Tools / Parts Required:

  • Ferrules.
  • Crimp Tool.

Action:

  • The VFC acts as a simple switch, the polarity of connection is irrelevant.
  • The maximum voltage that can be applied across the VFC is 60 V DC or 60 V AC  RMS.
  • The minimum loop impedance of the circuit must be 100 Ω in order to meet line-to-line surge immunity requirements.
  • The VFC is to be wired into an alarm circuit, or VFC input of a data logging device as follows:

Test:

  • With the logger un-powered - test that the resistance between VFC ports is > 1 MΩ.
  • With the logger powered and fault-free - test that the resistance between VFC ports is < 8Ω.

3.7.4 Auxiliary Power Output

A 5 V DC, 1 W regulated power supply is made available at the rear of the unit to power auxiliary sensors.

The output is short-circuit and overload protected.

Tools / Parts Required:

  • Ferrules
  • Crimp Tool

Action:

  • Connect the SA380-IT 5 V terminal to the positive power terminal of the auxiliary equipment.
  • Connect the SA380-IT 0 V terminal to the negative power terminal of the auxiliary equipment.


Test

  • With the logger powered, check for 5 V DC across the output terminals.

3.7.5 RS485

The RS485 link is provided to allow data connection to auxiliary sensors and data logging equipment.

Tools / Parts Required:

  • Ferrules.
  • Crimp Tool.

Action:

  • Wire the RS485 link using twisted pair cable.
  • For wiring runs over 10 meters consider using screened cable is interference maybe experienced.
  • For wiring runs over 30 meters, 100 Ω line-termination resistors should be fitted across the "A,B" terminations at both extremities of the data link.
  • Wire "A" to "A" and "B" to "B" on all devices
  • RS485 supports a multi-drop bus architecture, numerous devices can share the same RS485 bus.

.

Test:

  • With an RS485 device configured, the RS485 indication will light steadily to indicate a valid data session.
  • A flashing RS485 indication indicates that devices are configured to converse, but are unable to do so.

3.8) Commissioning

The following steps are recommended to commission the SA380-IT into service:

  • Test all wiring for continuity.
  • Visually inspect all wiring for sound installation.
  • Measure voltages of supply and monitored circuits an confirm they are within specification.
  • Connect fuses and/or links of monitored circuits.
  • Perform a manual earth test of all monitored circuits.

    The results of earth testing after installation should be the same as prior to installation.

    If the results of earth testing are worse, then the SA380-IT maybe damaged.

    Remove the device from service immediately and return to MPEC for investigation.

  • Apply main power to the SA380-IT.
  • Connect to the SA380-IT using the web based tool (see section 4.3)

    You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections

    The SA380-IT will not perform any measurements if the time is not set.

  • Perform monitored circuits setup (see section 4.4.8 and 4.4.9).
  • Check alert levels meet your requirements.

    Please check that the factory set earth loop and insulation resistance alarm levels are correct for your application. (See section 4.4.10)

  • Check that the device can connect to the Enterprise Asset Management System (See section 4.4.4).

 


4) Operation

This section details the meaning of the front panel indications and the operation of the web-based interrogation and configuration tool.

4.2) SA380-IT Front Panel Indications

IndicationColourSteady OnSteady OffPulsateFault Finding Actions
GreenPower applied to SA380-IT.SA380-IT unpowered or faulty.NADevice faulty if power applied and unlit.
Green

The modem is registered and attached to the GPRS network.

GPRS Network unavailable or device configured to use Ethernet.

NACheck network connection and network settings if unlit.
GreenA data session is in progress with an enterprise asset management system.

The asset management system is unavailable and the device is in fall-back.

NACheck live device status and network server settings.
GreenSelf-test in progress.Self-test not in progress.NADevice faulty if in normal mode and this does not light once every 30 seconds.
GreenSoftware failure.Software failure.Normal Operation.Restart device if steady on or steady off. Remove from service if fault persists.
RedSafety Interlocks have detected a device fault, or earth loop resistance is above alert threshold.No hardware fault, earth loop resistance within tolerable range.NASee section 5. (Fault Finding) if lit.
RedOne or more of the monitored circuits is presently below the configured alert threshold.All monitored circuits are presently safely above the configured alert threshold.NARemedial action required to monitored circuits if lit.
GreenA data session is in progress with another device on the serial portNo data connection is configured for the serial portA data connection has been configured, however the device is unable to converse.Check serial connection, live status and serial settings if pulsating.

The volt-free contact output will be open when either HW FAULT or EARTH FAULT are lit.


The label on the front of the SA380-IT is for recording useful information about the product:

1Site NameWrite the unique name of the device here such that it matches that of the device configuration.
2IP AddressWrite the devices Ethernet IP address here. This is to ease on-site connection via an Apple iDevice or Computer.
3SIM Serial No.Fitted at factory.
4SA380-IT Serial No.Assigned at factory.

4.3) Connecting the SA380-IT with a Computer or Apple device

4.3.1 Connect to a Computer directly using an Ethernet Cable

  • Connect Ethernet Cable.
  • The following instruction apply to the "Windows 10" operating system, however the network settings will be the same regardless of operating system.
  • Open Networks & Sharing Center:
  • Change Adapter Settings:
  • On "Local Area Connection", right-click, select "Properties":
  • Select "Internet Protocol Version 4 (TCP/IPv4)", then click "Properties":
  • Use the following IP settings, then click OK:


    These settings assume that the SA380-IT resides on the 192.168.100.xxx sub-net. This is the default setting. If the IP address of your SA380-IT has been changed, it should be recorded on the front panel of the device (see 4.2). You may need to change the IP address in the above dialogue box to match the sub-net of your SA380-IT.

  • Connect to the web-based configuration and diagnostics tool using any HTML 5 compatible web browser. Use the IP address displayed on the front of the device. The default IP address is 192.168.100.115.

4.3.2 Connect to an Apple Device directly using a Lightning to Ethernet Cable

  • Connect the Lightning to Ethernet Cable (MPEC part no. SA380-IT-LE)


  • Open the App
      

  • If your IP is 192.168.100.115 the the web-based configuration and diagnostics tool will load automatically:
      

  • If the SA380-IT IP address differs from that above, tap the address bar and enter IP address of the SA380-IT as recorded on the front of the device:
     

  • If the SA380-IT sits outside the 192.168.100.xxx sub-net, then the network settings of the App need to match those of the SA380-IT device. These can be altered by tapping the "Cable" button. Follow the advice in section 4.3.1.


    • Intermittent cable connection may make cause your the iOS device to be unable to recognize the Lightning to Ethernet cable any more:
    • Should this happen you need to restart the iOS device and start the application again.

4.4.4 Connect via a Local Area Network using Ethernet

  • You may connect to an SA380-IT over a local network (LAN):
  • When connected via Ethernet, your computer may receive an IP address automatically via DHCP.
  • If IP address are assigned statically, you will need to configure your computers IP address to that of the local network as in "Connect to a Computer directly using an Ethernet Cable". (4.3.1)

Once your computer is connected to the same LAN as the SA380-IT, enter the static IP of the SA380-IT device,  (as written on the front panel), into any HTML 5 compatible web browser:

4.4.5 Connect via GSM Network

  • Connection to an SA380-IT is only possible if the GSM provider has assigned the SA380-IT with a fixed IP. This can typically be achieved through provision of a private APN, or VPN.

  • If your SA380-IT has a rout-able IP address, then simply enter the Wireless IP into the web-browser of a computer that sits on the same network.

The Wireless IP is provided by the GSM operator. It is not to be confused with the Ethernet IP displayed on the front of the SA380-IT.

  • Configuration of private APNs and VPNs is beyond the scope of this user guide.

4.4) Navigating the SA380-IT User Interface

4.4.1  Main Menu

You may need to set the time on the device if the SA380-IT is unable to locate a time-server using the GSM or Ethernet connections.

The SA380-IT will not perform any measurements if the time is not set.

No.NameDescription
1HelpEach page features a help link to this user guide.
2SiteThe name of the installation.
3Device IDThe unique ID of the device.
4Measurement DataClick here to access live measurement readings of monitored circuits.
5Device StatusClick here to access live connectivity and device health information.
6UtilitiesClick here to access engineering functions such as device and communications reset, time update and firmware upgrade.
7SettingsClick here to access all device settings.
8AboutClick here to view hardware and software build information.

4.4.2  Live Measurements

No.NameDescription
1BackNavigates back to the main menu.
2Connection StatusA green dot indicates a live connection to the device. A red dot denotes that the connection has been lost.
3TimeThe current time set on the device.
4AC Monitored CircuitAC monitored circuits show circuit voltage and equivalent resistance to earth (RL).
5Locked Monitored CircuitThis circuit is suffering from an under-voltage hence no resistance to earth reading has been taken.
6DC Monitored CircuitDC monitored circuits show circuit voltage and equivalent resistance to earth of each circuit leg (RB and RN).
7Earth Loop ResistanceThe resistance between FE and Loop Earth terminals.
8Current TestDisplays the test currently being performed by the device at the moment the page refreshed.
 Technicians ModeClicking on the white region of a monitored circuit or earth loop display will cause the device to enter Technicians Mode for that particular circuit.
 Missing CircuitsOnly monitored circuits configured for measurement are displayed.
 Green Text

..is used to denote monitored circuits where resistance to earth is above the defined alert thresholds.

..is used to denote that earth loop resistance is below the defined alert threshold.

 Orange Text..is used to denote monitored circuits suffering from a recoverable device interlock.
 Red Text

..is used to denote monitored circuits where resistance to earth is below the defined alert thresholds.

..is used to denote that earth loop resistance is above the defined alert threshold.

..is used to denote monitored circuits suffering from an unrecoverable device interlock.

4.4.3  Technicians Modes

No.NameDescription
1BackNavigates back to the live measurements screen and terminates technicians mode.
2Circuit Name & Connection Status

The name of the monitored circuit. A green dot indicates a live connection to the device. A red dot denotes that the connection has been lost.

The physical input of the device to which this monitored circuit is connected is shown below.

3DumpDisplays a detailed diagnostic data dump (for manufacturers use).
4TimeThe current time.
5VoltageThe monitored circuits present voltage. Not displayed if earth loop resistance has been selected.
6Resistance

AC monitored circuits show equivalent resistance to earth (RL).

DC monitored circuits show equivalent resistance to earth of each circuit leg (RB and RN).

The Earth Loop circuit shows the present resistance between FE and Loop Earth terminals.

 Technicians Mode

Whilst in technicians mode, only the selected circuit is measured. This improves response time for the circuit of interest to aid faulting activities.

No other monitored circuit is measured, earth loop resistance is not measured (unless selected), device integrity checks are not performed.

The user should manually exit technicians mode when it is no longer required such that other measurements recommence.

If the user should forget to leave technicians mode, normal mode will automatically resume after a period of 4 hours.

 Green Text

..is used to denote monitored circuits where resistance to earth is above the defined alert thresholds.

..is used to denote that earth loop resistance is below the defined alert threshold.

 Orange Text..is used to denote that the monitored circuit is suffering from a recoverable device interlock.
 Red Text

..is used to denote monitored circuits where resistance to earth is below the defined alert thresholds.

..is used to denote that earth loop resistance is above the defined alert threshold.

..is used to denote monitored circuits suffering from an unrecoverable device interlock.

4.4.4  Device Status

No.NameDescription
1BackNavigates back to the live measurements screen.
2Connection Status

A green dot indicates a live connection to the device. A red dot denotes that the connection has been lost.

3TimeThe current time.
4Server Connection

Shows if the server connection is presently using GSM or Ethernet as a communications bearer.

Upon power-up, the SA380-IT will attempt to connect over GSM. If this fails, or if GSM is not configured, the device will attempt to connect over Ethernet.

If the connection attempt over Ethernet is unsuccessful, or Ethernet is not configured, the device will re-attempt to connect over GSM, and the cycle repeats.

The coloured circle denotes the present state of the Enterprise Asset Management System (EAMS) server connection:

BlackEAMS Server connection is not initialised - please wait.
Red

...when connection is first established: The EAMS server has yet to be contacted.

...after which: The EAMS server can not be reached.

If using the MIMOSA protocol, the device can reside in a prolonged "back-off" state for up to 4 hours. During this period the SA380-IT will not attempt re-connection.

If connection remains "red" for more than 10 minutes in the case of the MPEC RailDAQ protocol, or 4 hours in the case of the MIMOSA protocol, refer to the troubleshooting steps below.

Orange

Indicates that "handshaking" events have taken place with the EAMS server, but no data has been sent.

If the connection remains "orange" for more than 2 minutes, refer to the troubleshooting steps below.

GreenThe SA380-IT is connected to the EAMS server side system and data is being successfully transmitted.
5Wireless Operator

Displays the connection state of the modem:

Blank: Modem not configured.

Waiting for Modem: The SA380-IT is waiting for the modem to power-up.

Searching: The modem is searching for an operator.

Operator Name: When registered with an operator, the operator name, and GSM signal strength is displayed.

Signal Strength:

BarsMeaning
1Poor - Requires improvement
2OK - May struggle at times
3Good - No action required
4Excellent - No action required
6Wireless IP

The IP address obtained by the modem for the GPRS data session:

Blank: GSM modem off or not registered with a carrier.

0.0.0.0: Unable to create a GPRS session.

Valid IP Address: GPRS session successfully established.

7Ethernet IP

The SA380-IT does not support DHCP, and can therefore not request an IP from another device.

The Ethernet IP address is "static" and assigned by the user through configuration. It is the configured IP address that is displayed here.

8Queued EventsHow many data events are awaiting transmission to the server.
9TemperatureInternal temperature of the SA380-IT.
10Run TimeHow long the SA380-IT has continuously operating since last reboot.

Connection Troubleshooting:

For a GSM connection:

  • Check the correct configuration for the SIM. (APN, Username, Password)
  • Check that GSM signal strength is sufficient. (2 or more bars)
  • Check that the modem has registered. (operator name displayed)
  • Check that a GPRS session is active. (Wireless IP Address obtained)
  • Check that the SIM is activated, with the correct APN enabled. (with carrier)

For an Ethernet connection:

  • Check that the Ethernet settings are correct. (IP address, subnet, gateway and DNS entries)
  • Check that GSM has been disabled. (APN is blank)
  • Check wiring.
  • Check "upstream" routing equipment and settings.

In both instances:

  • Check that the server settings are correct. (Correct URL and protocol)
  • Check that the server is contactable. (with company IT support)

4.4.5  Utilities

No.NameDescription
 Authentication

All items on this screen change the behaviour of the SA380-IT. Authentication (username and password) are required to carry-out these actions.

Please contact MPEC or your line manager to obtain the correct credentials.

1Back

Navigates back to the main menu.

2

Pause Data Collection /

Resume Data Collection

This toggles the SA380-IT between suspended mode and normal mode (see section 2.3).

The SA380-IT will not attempt any measurement during suspended mode, nor connect any monitored circuit to the measurement circuitry or earth. This is to allow fault finding activities to take place on the connected circuits without having to physically disconnect the device.

The user should manually exit suspended mode when it is no longer required such that measurements recommence.

If the user should forget to terminate suspended mode mode, normal mode will automatically resume after a period of 4 hours.

3Reset Safety Interlocks

This will clear any safety interlocks that are presently restricting measurement.

Ensure that you have exhausted all fault finding tasks prior to manually resetting any device interlock (see section 5.2)

4Restart Communications

This will drop any existing communication link and attempt to build up the link again from scratch.

When using the MIMOSA protocol this will reset any back-off period.

When using the GSM modem, the modem will restart.

5Clear QueueThis will erase all pending messages waiting to be sent to the server. The data will be permanently lost.
6Set Time From BrowserThe SA380-IT requires the time to be set before measurement can commence. This is normally done through connection to time server. In the event that a time server is unavailable the time can manually be set using this feature.
7RebootPerforms a software restart of the device.
8Upgrade FirmwareOpens the "Upgrade Firmware" screen.

4.4.6  Upgrade Firmware

No.NameDescription
1Back

Navigates back to the Utilities menu.

2Current VersionDisplays the currently installed Firmware Version.
3

Select Firmware Package

Clicking here will open a file select dialogue. Select a valid firmware (.bin) file and hit "Open".

4Filename

Only visible once a valid firmware file has been selected.

The name of the selected firmware file

5Package Version

Only visible once a valid firmware file has been selected.

Displays the firmware version contained within the selected file.

6Upload Firmware

Only visible once a valid firmware file has been selected.

Authentication (username and password) is required to upgrade firmware.

Please contact MPEC or your line manager to obtain the correct credentials.

Click here to commence upgrade. A progress bar will display firmware upload progress.

Once upload is complete the SA380-IT will restart to apply the upgrade.

Accidental termination of firmware upgrade will not harm the SA380-IT, however I reboot may be required to recommence measurement in a timely manner Without a restart the SA380-IT will wait for 4 hours for the remainder of the firmware file to be uploaded, during which time, measurement is suspended.

4.4.7  Settings

In all cases, modified configuration items will be highlighted in green.

"Write Config" must be clicked to apply changes. This requires user authentication.

EAMS = Enterprise Asset Management System.


No.NameDescription
1Back

Navigates back to the Main menu.

2Device NameClick here to change the Device Name.
3

Earth Loop Name

Click here to change the name of the Earth Loop circuit. This name will appear on the live measurements screen and be transmitted to the EAMS.

4Monitored Circuits Settings

Click here to configure individual monitored circuits. Unused inputs will display as "unused x"

5Auto Detect Circuits

Click here to perform automated configuration of all monitored circuits

6Advanced

Opens the "Advanced" settings menu.

The SA380-IT default settings have been carefully chosen to be for most installations. Modify "advanced" settings with caution.

4.4.8  Monitored Circuit Settings

EAMS = Enterprise Asset Management System.


No.NameDescription
1Back

Navigates back to the Settings menu.

2NameThe name of the circuit. This will appear on the user interface to identify the circuit, and will be transmitted to the EAMS.
3

Voltage

The nominal voltage of the monitored circuit.

Setting the voltage to "0" will disable this circuit.

The monitored circuit voltage is used to set over-voltage thresholds. Incorrectly setting this value could lead to a dangerous situation in the event of failure.

4AC/DC

Click here to configure the circuit as an AC or DC circuit. This affects voltage and earth leakage measurement.

Incorrectly setting of AC / DC will result in incorrect voltage and earth resistance readings.

5Earth Leakage AoC%

Sets the "Acquire-on-Change" threshold for reporting "resistance to earth" change to the EAMS (see section 2.10).

This settings applies to this monitored circuit only.

6Voltage AoC%

Sets the "Acquire-on-Change" threshold for reporting voltage change to the EAMS (see section 2.10).

This settings applies to this monitored circuit only.

4.4.9  Auto Detect Circuits

No.NameDescription
  

Auto Detect will clear device interlocks

Ensure that you have exhausted all fault finding tasks prior to manually resetting any device interlock (see section 5.2)

1BackNavigates back to the Settings menu
2

Detection Results

The auto-detect feature is designed to simplify commissioning of the SA380-IT.

For most applications, running and verifying the result of the Auto-Detect output is all that is required to configure the SA380-IT.

The SA380-IT will measure each monitored circuit in turn and set-up the channel to one of the following based upon the measured voltage:

Nearest VoltageNameAC / DC
12 V DCB12DC
24 V DCB24DC
50 V DCB50DC
120 V DCB120DC
110 V ACBX110AC

Acquire on Change settings are set to 5% for all circuits.

If multiple circuits are detected with the same nominal voltage they will be named B50, B50(1), B50(2) etc.

If any of the settings are incorrect, they can be modified using the "Monitored Circuit Settings" screen.

4.4.10  Advanced

EAMS = Enterprise Asset Management System.

Advanced settings do not normally require modification. Do not modify any of these settings without an understanding of the consequence.


No.NameDescription
1Back

Navigates back to the Settings menu.

2Device IdThe unique ID of this SA380-IT, used to identify the device with the EAMS. This is set at factory and cannot be changed.
3

Manufacturer Id

The MIMOSA manufacturer ID assigned to MPEC Technology Ltd by the MIMOSA foundation. This is set at factory and cannot be changed.

4Server NameThe URL or IP address of the EAMS entry point for messaging.
5SNTP Time ServerThe URL or IP address of a time server that the SA380-IT can use to update its time if the EAMS is unreachable.
6APNThe name of the GSM access point the SA380-IT is to connect to. It is set-up by the SIM provider.
7APN UsernameMany GSM Access Points require username and password authentication to allow connection. Change these here.
8APN PasswordMany GSM Access Points require username and password authentication to allow connection. Change these here.
9Earth Loop AoC %Sets the "Acquire-on-Change" threshold for reporting "earth loop resistance" change to the EAMS (see section 4.10)
10Earth Loop Alert Level Ω

If the earth loop resistance exceeds this level, the SA380-IT will report a hardware fault and stop measurement of monitored circuits.

11AC Leakage Alert Level Ω

If the resistance to earth of any AC monitored circuit falls below this level, the SA380-IT will report a earth fault.

Ensure that the level is appropriate for your organisations needs and complies with any legal safety obligations.

12DC Leakage Alert Level  Ω

If the resistance to earth of any DC monitored circuit falls below this level, the SA380-IT will report a earth fault.

Ensure that the level is appropriate for your organisations needs and complies with any legal safety obligations.

13Circuit Settling Time (ms)

This parameter governs the maximum allowable time to measure the voltage and resistance to earth of a individual monitored circuit.

It is up to the user to specify an appropriate time-out value, based upon the trade-off between desired accuracy and speed of measurement.

The equation for calculating measurement time per circuit is: (750,000 x CE) + 0.3 seconds. Where Cis the maximum expected capacitance to earth of the monitored circuit. The factory default is set at C= 1 μF.

14Earth Loop Pulse Time (ms)

 This parameter governs the maximum allowable time to measure the earth loop resistance.

It is up to the user to specify an appropriate time-out value, based upon the trade-off between desired accuracy and speed of measurement.

15Ethernet IP Address

 The fixed Ethernet IP address of the SA380-IT.

This IP address is used for local configuration and diagnostics. If this IP address is changed you must record the new IP address on the front panel of the device.

16Ethernet Net MaskThe IP Sub-net mask to allow sharing of IP addresses.
17Ethernet Default RouteThe default route out of the SA380-IT to the Internet.
18Primary DNS ServerPrimary domain name server to perform IP address look-up.
19Secondary DNS ServerSecondary domain name server to perform IP address look-up.
20Snapshot Period (min)Period of time that must elapse before a snapshot message is sent to the EAMS (see section 4.10).
21Post Trigger Sample (s)Period of time that must elapse before delayed acquisition is sent to the EAMS (see section 4.10).
22Server Protocol

 Select the desired EAMS protocol:

ProtocolNetwork Rail Intelligent InfrastructureMPEC Centrix
MIMOSA
  •  
  •  
RailDAQ 
  •  
23Server Connection Type

Select desired connection type:

GSMUse GSM exclusively for server connection
EthernetUse Ethernet exclusively for server connection
anyUse either GSM or Ethernet for server connection
24Display Mode

Select the desired display mode:

RawMeasured values are displayed at full resolution for debugging
FormattedMeasured values are displayed rounded for ease of reading

4.4.11  About

No.NameDescription
1Back

Navigates back to the main menu.

2

Version

The deployed software version and build date.

3Build DateThe date the firmware was created.
4CopyrightManufacturers copyright.

5) Faulting & Maintenance

The SA380-IT is designed to require minimal maintenance, with an anticipated product lifespan of 15 years. To maintain safe operation of the device over its service life, the following faulting and maintenance activities are recommended.

5.1) Physical Inspection

An annual physical inspection of the SA380-IT is recommended.

Activity 
CleanWipe the SA380-IT with dry cloth to remove dust and loose particles.
Inspect

Ensure all wiring is in good order and free of degradation.

Ensure the the SA380-IT enclosure is in sound condition.

InspectEnsure the SA380-IT does not have the HW FAULT indication lit.

In the event of an illuminated HW FAULT light, please consult section 5.2

In the event of enclosure damage, the SA380-IT is to be immediately removed from service.

5.2) Faulting Device Interlocks

Section 2.7 describes how the SA380-IT is continuously checking that all internal circuitry is functioning within established operating parameters. 

Whilst device interlocks are designed to only operate under genuine fault conditions, scenarios exist that cause them to falsely trigger. In such scenarios it is desirable to manually clear device interlocks in order to recommence measurement.

There are four ways to clear device interlocks:

  • Power cycle the SA380-IT on-site.
  • Reboot the SA380-IT using the web-based tool.
  • Clear device interlocks using the web-based tool.
  • For self-clearing interlocks - remove the fault.

Always investigate the cause of a device interlock before manually clearing it down.

Clearing down a device interlock is unlikely to put the SA380-IT into a dangerous state, as the same self-checks that enabled the interlock will re-enable the same interlock if the fault persists. Self-clearing device interlocks will automatically clear as soon as the fault is removed.

The table below shows all device interlocks, potential causes and remedies.

 Genuine Hardware FaultPotential False-TriggerSelf Clearing?Fault Finding Actions
Monitored Circuit Under-Voltage

Resistive cable open circuit.

Internal measurement circuit fault.

Circuit configured to perform measurement, however no circuit is physically attached.

Circuit configured to perform DC measurement, however circuit is wired with the incorrect polarity.

Circuit configured to expect a DC voltage, however an AC voltage is present.

Monitored circuit is temporarily not energised.

Yes

Check monitored circuit wiring integrity

Replace resistive cable.

Disable unused circuits using the web-based tool.

Ensure the correct voltage type (AC/DC) is configured for the monitored circuit.

Check monitored circuit for voltage.

Negative Earth Loop Resistance

Internal measurement circuit fault.

Transient event on the earth loop.

Yes

Check earth loop wiring integrity.

High Earth Loop Resistance

Earth loop wiring has become disconnected.

Internal measurement circuit Fault.

The installations earth loop impedance is genuinely out of tolerance.

Transient event on the earth loop.

Yes

Check earth loop wiring integrity.

Check earth continuity of the electrical installation.

Monitored Circuit Over-Voltage

Resistive cable short circuit.

Internal measurement circuit fault.

Transient event on the monitored circuit.

Circuit configured to monitor a lower voltage than that connected.

No

Replace resistive cable.

Ensure the correct nominal voltage is configured for the effected circuit.

Ensure the correct voltage type (AC/DC) is configured for the monitored circuit.

Internal Relay Fault

Internal measurement circuit fault.

Transient event on one of the monitored circuits.

No

None.

Out of Tolerance

Internal measurement circuit fault.

Extreme temperature event.

No

None.

If device interlocks persist after fault finding actions have been exhausted the SA380-IT should be removed from service and returned to MPEC for investigation.

 


6) Technical Data

6.1) Specification

Insulation Coordination to EN50124-1 & EN60101-1  
Nominal System Supply Voltage (UN)AC 110 V RMS 
Over-voltage CategoryCAT IV 
Rated Impulse Voltage Withstand (UNi)4 kV 
Pollution Degree3 
Rated Insulation Voltage (UNm)AC 185V RMS 
Inter-Monitored Circuit Isolation Voltage (Galvanic)+/- 400 V PeakMin.
Inter-Monitored Circuit Protective Impedance (in break-down)140 kΩMin.
All devices undergo factory Hi-Pot testing  
Supply Voltage  
Operating Voltage Range

AC 50-160 V RMS

+15%
Operating Frequency Range50 to 60 Hz 
Max. Power Consumption6 VA 
Monitored Circuits Voltage  
Number of Independent Circuits Monitored5AC or DC
Operating Voltage Range

AC 5-160 V RMS

DC 5-160 V RMS

+15% 

+15%

Operating Frequency RangeDC to 60 Hz 
Accuracy+/- 5 % 
Monitored Circuits Insulation Resistance  
Equivalent Resistance to Earth (RL = RB//RN)0 Ω to 5 MΩAC Circuits
Actual Resistance to Earth (RB and RN)0 Ω to 5 MΩDC Circuits
Accuracy

+/- 1 kΩ

ZL < 20 kΩ

 +/- 5 % *

ZL >= 20 kΩ

Alarm Value1 kΩ to 1 MΩ 
Factory Alarm Value

50 kΩ

120 kΩ

DC Circuits

AC Circuits

Fixed Hysteresis+5%AC and DC circuits
Standard Response Time (per circuit) TR1.1 sTypical

Actual Response Time (per circuit) TR

(Assumes static impedance to earth)

(750,000 x CE) + 0.3

 

seconds
Product Response TimeTR X Number of Circuits in OperationTypical

System Leakage Capacitance (CE)

(per circuit)

0.1 μF

100 μF

Min.

Max.

Factory Set Max. Leakage Capacitance (CE)1 μFper circuit

*See section 2.5 for an explanation of measurement accuracy with regard to the insulation resistance of DC monitored circuits.

*Accuracy de-rated to -5% to +6% in the presence of strong radiated EM fields at 20 V/m at 800 MHz to 1 GHz and 10 V/m at 1.4 GHz to 2 GHz.

A typical mobile digital telecommunications device must be placed within 20 mm of the SA380-IT enclosure to experience these levels.

 

Measuring Circuit  
Measuring Voltage+/- 46 V 
Measuring Current< 700 μA 
Internal Resistance & Impedance> 45 kΩno resistive cable fitted
System Resistance & Impedance> 70 kΩresistive cable fitted

Measuring Circuit is only connected to a

single Monitored Circuit at any one time

  
Internal System Check FrequencyEvery 30 s 
Earth Loop Circuit  
Measuring Voltage+/- 3.5 V Max.
Measuring Current< 500 μA 
System Resistance & Impedance> 25 kΩFE to SE
Tolerance to Stray Interference Voltage+/- 500 mV pk.Max.
Measurement Range0 Ω to 2 kΩ 

Accuracy

+/- 0.5 Ω

RE < 10 Ω

 +/- 5 %

RE >= 10 Ω

Alarm Value

0 Ω to 2 kΩ

 
Factory Alarm Value1 kΩ 
Fixed Hysteresis+5% 
Output Ports  
Auxiliary Power Output

5 V

1 W

 +/- 10 %

 +/- 10 %

Volt-Free Contact OutputN.OSPST 
Volt-Free Contact Withstand Voltage+/- 100 V PkMin.
Volt-Free Contact On Resistance8 ΩMax.
Volt-Free Contact Off Resistance1 MΩMin.
Volt-Free Contact Current Handling150 mAAC or DC RMS
Volt-Free Contact Mimimum Load100 Ωrequired to assure surge immunity

Serial Data Output

EIA RS485

 

Wireless Modem (SIM Factory Fitted)SMA (Female)GSM 2G GPRS
Ethernet*RJ45

10/100 Mbs

Auto MDIX

*Ethernet is ordinarily for use as a monitoring port only. Ethernet port requires additional surge protection when used as a permanent connection.

 

Supported Protocols  

MPEC RailDaq

Efficient Data Communications

Ethernet

GSM

RS485

TCP/IP Port 7777

TCP/IP Port 7777

112,800 bps

Network Rail MIMOSA

Verbose Data Communications

Ethernet

GSM

TCP/IP Port 80

TCP/IP Port 80

SNTP

Time Synchronization

Ethernet

GSM

UDP Port 123

UDP Port 123

HTTP

Configuration and Live Data

Ethernet

GSM

TCP/IP Port 80

TCP/IP Port 80

Environmental  

EMC Emissions & Immunity

EN50121-4

 

Surge Immunity: Monitored Circuits & Earth

EN61000-4-5

4kV

Voltage Withstand

EN50124-1

EN61010-1

 

Climatic ClassEN50125-3T1 In cubicle

Ambient Operating Temperature

-25 °C to +70 °C

 

Storage Temperature-40 °C to +85 °C 
Humidity5 % to 100 %Condensing
Vibration

2.3 m/s2

 

3 - axis'
Impact ProtectionIK06 
Ingress ProtectionIP52 
Flammability RatingUL94 V0 
ESDNot protectedObserve ESD handling precautions

6.2) Mechanical

Installation Data  

Mounting

BR930 / Q Style Mounting Plate

 

Primary Connections

Wire Size: 2.5 mm2 max.

Spring Clamp

Auxiliary Connections

Wire Size: 1.5 mm2 max.

Spring Clamp

Weight350g 

 

6.3) Ordering Details

DescriptionMPEC Part No.NR PADs No.

SA380-IT Multiple Bus-Bar Insulation Monitor Device.

Without plug couplers or cables

SA380-IT-NRTBC
Plug coupler and cable kitSA380-IT-KTTBC

SA380-IT Multiple Bus-Bar Insulation Monitor Device.

With plug couplers and cables (SA380-IT-NR + SA380-IT-KT + GSM Antenna)

SA380-IT-SDTBC
SA380-IT Spare Connector SetSA380-IT-CNTBC
SA380-IT 47KΩ Resistive Cable - 3 metersSA380-IT-RCTBC
SA380-IT Lightning to Ethernet CableSA380-IT-LETBC
SA380-IT Hand-held Configuration and Diagnostics DeviceSA380-IT-CDTBC
SA380 Series Hinged Wall BracketBRK-HINGETBC

Base Unit Kit Contents

(MPEC Part No. SA380-IT-NR)

Qty
SA380-IT Module1
M5 Spring Washer2
M5 Nut2

Plug Coupler and Cable Kit Contents

(MPEC Part No. SA380-IT-KT)

Qty
10 Way 5 mm Pitch Connector1
6 Way 5 mm Pitch Connector1
6 Way 3.5 mm Pitch Connector1
3 m Resistive Cable8
6 m grey A1 0.75 mm signalling cable1

SA380-IT-SD: Orders over 10 units will be shipped with 1 complimentary Ethernet-to-Lightning cable for every full 10 units ordered.

 

 


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