Ampcontrol ECD User manual

ECD – Earth Continuity Protection Relay
User Manual
[Ex ia] I -20°C ≤ Ta ≤ 65 °C
IECEx TSA13.0004X
Part Number: 166351
Revision: 3 – March 2020
Designed and manufactured in Australia by Ampcontrol CSM Pty Ltd

Ampcontrol CSM Pty Ltd - ABN 35 000 770 141
ECD User Manual
Rev 3 – March 2020
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WARNING!
This safety alert symbol identifies important safety messages in this manual and
indicates a potential risk of injury or even death to the personnel. When you see
this symbol, be alert, your safety is involved, carefully read the message that
follows, and inform other operators.
CAUTION!
This safety alert symbol identifies important information to be read in order to ensure
the correct sequence of work and to avoid damage or even destruction of the
equipment, and reduce any potential risk of injury or death to the personnel.
Supplementary information not directly affecting safety or damage to equipment.
Carefully read the message that follows, and inform other relevant personnel.
Information concerning possible impact on the environment and actions required for
prevention and proper response.

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Copyright Notice
The Ampcontrol ECD described in this document is the property of AMPCONTROL PTY LTD. It is furnished under a license
agreement and is to be used only in accordance with the terms of the agreement.
No part of the hardware or documentation may be reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any language or computer language, in any form or by any means, without prior written permission of
AMPCONTROL PTY LTD.
Disclaimer
While every effort has been made to assure the accuracy and clarity of this document, AMPCONTROL PTY LTD assumes no
liability resulting from any omissions in this document, or from misuse of the information obtained herein. The information in this
document has been carefully checked and is believed to be entirely reliable with all of the necessary information included.
AMPCONTROL PTY LTD reserves the right to make changes to any products described herein to improve reliability, function,
or design, and reserves the right to revise this document and make changes from time to time in content hereof with no
obligation to notify any persons of revisions or changes. AMPCONTROL PTY LTD does not assume any liability arising out of
the application or any use of any product or circuit described herein; neither does it convey license under its patent rights or the
rights of others.
Before You Begin
We would like to take a moment to thank you for purchasing the ECD Earth Continuity Relay.
WARNING!
To become completely familiar with this equipment and to ensure correct
operation, we strongly recommend that you take the time to read and
thoroughly understand this user manual.
Ampcontrol CSM Contact Details
7 Billbrooke Close, Cameron Park, NSW, 2285
P [phone] | F [phone]
EMAIL: [e-mail]
WEB: www.ampcontrolgroup.com

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TABLE OF CONTENTS
1 SAFETY AND OTHER WARNINGS.............................................................................5
1.1 Safe Use of Equipment......................................................................................5
1.2 Intrinsic Safety Considerations ............................................................................6
2 RECEIVING AND STORAGE.....................................................................................7
2.1 Receiving.......................................................................................................7
2.2 Inspection ......................................................................................................7
2.3 Storage after Delivery .......................................................................................7
2.4 Unpacking of Equipment....................................................................................7
3INSTALLATION .....................................................................................................8
3.1 General Warnings ............................................................................................8
3.2 Mandatory Installation Practices ..........................................................................8
3.3 Installation Orientation.......................................................................................9
4 ECD RELAY OVERVIEW........................................................................................10
4.1 Mechanical Arrangement .................................................................................11
4.2 Electrical Connections.....................................................................................12
5 COMMISSIONING AND CALIBRATION .....................................................................14
5.1 Earth Continuity Test – Series Resistance............................................................14
5.2 Earth Continuity Test – Shunt Resistance ............................................................14
5.3 Remote Start Function ....................................................................................14
6 AS/NZS 2081 PROTECTION FUNCTION: EARTH CONTINUITY .....................................15
6.1 Series Resistance ..........................................................................................15
6.2 Shunt Resistance...........................................................................................15
6.3 Remote Start ................................................................................................16
6.4 Latching mode ..............................................................................................16
6.5 Manual reset procedure...................................................................................16
7 OPERATION SUMMARY........................................................................................17
7.1 DIP Switches Configuration ..............................................................................17
7.2 Rotary Switches Configuration ..........................................................................17
7.3 Indication LEDs .............................................................................................17
7.4 Fault Indication..............................................................................................18
7.5 Starting the ECD............................................................................................18
8 SERVICE, MAINTENANCE & DISPOSAL ...................................................................19
8.1 Equipment Service .........................................................................................19
8.2 Equipment Maintenance ..................................................................................19
8.3 Disposal ......................................................................................................19
9SPECIFICATIONS ................................................................................................20
10 EQUIPMENT LIST...............................................................................................21
APPENDIX A - DRAWINGS.........................................................................................1
APPENDIX B - APPROVALS .......................................................................................1

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1SAFETY AND OTHER WARNINGS
For safety reasons, the ECD must be installed, operated and serviced only by competent personnel. Read and understand this
instruction manual completely before installing, operating or servicing this equipment. Failure to install or operate this instrument
in accordance with the instructions contained in this manual may result in non-conformance to the conditions of certification and
create hazardous operating conditions.
WARNING!
To comply with the Conditions of Certification, ensure full serviceable life of the
product, and avoid nullifying the warranty, it is essential to exercise great care
with the installation, use and storage of the system components. Failure to
comply with the Conditions of Certification may seriously compromise the
integrity of the system and/or its components, and the consequence could be
fatal. The user must ensure that the "Conditions of Certification" outlined in the
certificate are met or the certificate (and the IS rating) will not be valid.
1.1 Safe Use of Equipment
The equipment supplied has been manufactured according to the state of the art, and designed to ensure a safe operation. The
equipment may only be used within the design parameters.
The instructions within this manual must be observed as an aid towards achieving maximum safety during operation.
The owner/user is responsible for observing the following instructions:
1.1.1 Changes to Equipment
Changes in the design and modifications to the equipment are not permitted. Unauthorised changes made to the hardware or
operating firmware will void the manufacturer's warranty, and may compromise the conditions of certification, the integrity
of the system into which it is installed and other connected equipment.
1.1.2 Equipment Knowledge
Experience with, or understanding of, this equipment is essential for the safe installation and removal of the equipment.
Therefore, in case of a question on how to safely proceed, contact Ampcontrol immediately.
1.1.3 Manual Handling
Precautions have been taken to ensure all equipment is safe to handle and free from sharp edges. However care should always
be taken when handling enclosures and gloves should be worn.
1.1.4 Installation
Correct operation and safety depend on the ECD and associated equipment being installed correctly. Mechanical and or
electrical installation and maintenance of plant and equipment must only be carried out by appropriately qualified personnel and
must be tested thoroughly prior to operation.
1.1.5 Operation
As safety depends on the ECD functioning correctly it is highly recommended that all safety functions of the ECD be periodically
tested to ensure correct operation.

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1.2 Intrinsic Safety Considerations
•The ECD relay’s IS Pilot Terminal is protected by an internal IS barrier. In the event of a phase to pilot fault, this barrier
will clamp the voltage at the pilot terminal to a safe level and protect the relay from damage. However this barrier can
only withstand 5.25A for 1s. The ECD relay must, therefore, be installed in a system with earth fault current limitation
of 5A or less and an earth fault clearance time of less than 1s. Alternatively a 3A external fuse rated to system voltage
can be installed between the relay’s pilot terminal and the pilot conductor.
•The ECD relay must be located in a non-hazardous (safe) area.
•The ECD IS earth connection is critical to the IS protection and must be infallibly connected to the system earth. This
must be done with a minimum of 3 conductors, each of 1.5mm2as per the IS installation standards.
•The installation is to be in accordance with the relevant installation Standards/Codes of Practice.
•There are no user-replaceable or user-adjustable parts in the ECD system’s components.
DO NOT OPEN the ECD enclosure. Return to Ampcontrol for service & repair.

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2RECEIVING AND STORAGE
2.1 Receiving
All possible precautions are taken to protect the equipment against damage or losses during shipment, however before
accepting delivery, check all items against the packing list or bill of loading. If there are shortages or evidence of physical
damage, notify Ampcontrol immediately.
Notify Ampcontrol within 7 days (maximum) in case of shortages or discrepancies, according to the packing list. This action will
help ensure a speedy resolution to any perceived problems. Keep a record of all claims and correspondence. Photographs are
recommended.
Where practicable do not remove protective covers prior to installation unless there are indications of damage. Boxes opened
for inspection and inventory should be carefully repacked to ensure protection of the contents or else the parts should be
packaged and stored in a safe place. Examine all packing boxes, wrappings and covers for items attached to them, especially
if the wrappings are to be discarded.
2.2 Inspection
Equipment that is found to be damaged or has been modified away from its published specification must not be used. Please
contact Ampcontrol if the equipment is suspected to be different than that ordered or if it does not match the published
specifications.
2.3 Storage after Delivery
When the equipment is not to be installed immediately, proper storage is important to ensure protection of equipment and
validity of warranty.
All equipment should be stored indoors, preferably on shelves and protected from the elements.
2.4 Unpacking of Equipment
The method of packing used will depend on the size and quantity of the equipment. The following cautions should be
interpreted as appropriate.
CAUTION!
Take care when unpacking crates as the contents may have shifted during transport.
The disposal of packaging materials, replaced parts, or components must comply
with environmental restrictions without polluting the soil, air or water.
Ensure that any timber and cardboard used as packaging is disposed of in a safe and
environmentally responsible manner.
Where possible, dispose of all waste products i.e. oils, metals, plastic and rubber
products by using an approved recycling service centre.

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3 INSTALLATION
These instructions have been designed to assist users of the ECD Relay with installation and special wiring techniques required
to maintain the integrity of the intrinsically safe circuits.
3.1 General Warnings
Before the ECD can be installed, there are a number of things that need to be considered and understood to prevent incorrect
or unsafe operation of the ECD or the system into which it is installed.
Along with relevant competence, and an understanding of the target application, the following points should be considered:
3.1.1 Ensure that the information provided in this user manual is fully understood.
It is extremely important that the limitations and functionality of the ECD are understood to prevent incorrect installation and use
from creating a potentially dangerous risk. If in doubt as to the nature of the limitations or their implication, consult a competent
authority such as a supervisor or Ampcontrol technical representative.
3.1.2 Ensure that the application into which the ECD relay is being installed has been properly defined, designed and
approved.
Any system intended to mitigate the risk of injury needs to be properly designed and implemented. Such a system must be the
result of structured risk analysis with the outcomes used to define the system requirements. These requirements, in turn, will
guide the choice of instrumentation, logic solvers and actuators needed to implement the system. Understanding the needs of
the system will ensure proper selection of equipment.
3.1.3 Ensure that the ECD relay will properly perform the required functions within the system design.
It is important to understand how the ECD is intended to interact with other equipment within a system. For safe and reliable
use, it is crucial that neither the ECD’s logical operation nor its signalling be compromised by incompatibilities with connected
equipment.
3.1.4 Modifications of any form to the ECD relay are prohibited.
The ECD as supplied has been designed and manufactured to comply with the requirements of certification standards. If
modifications of any form are made to the ECD, the conditions of certification will no longer be valid and the equipment will no
longer be fit for use in a hazardous area. If any modifications or damage to the ECD is evident, do not use the equipment and
contact Ampcontrol for advice.
3.2 Mandatory Installation Practices
The following information must be adhered to when installing the ECD. Failure to adhere to this information may give rise to
unsafe operation and could render the product invalid against its certificate.
Using the ECD in a manner that exceeds its electrical, functional or physical specifications, or in a way that is contrary to its
operating restrictions, may create risks to personnel and/or equipment resulting in injury or death.
•The ECD must be powered within the specified voltage range.
•The installation of the ECD must be carried out by suitably trained and qualified personnel.
•Certification and identification labels fixed to the ECD must not be damaged, removed or covered before, during or
after installation.
•The installation is to be in accordance with the relevant installation Standards/Codes of Practice.
•Modifications must not be made to any part of the ECD. As supplied, the unit is built to, and complies with standards
against which it has been certified. Modification to its construction will render the unit incompatible with its certification.
•Complete and accurate records of the installation must be kept as part of the site installation.

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3.3 Installation Orientation
The ECD relay may be installed upside down without any degradation to the performance of the relay. The orientation of the
relay will depend upon the wiring requirements as some installations require the Pilot terminal to be positioned at the top while
others require the Pilot terminal to be positioned at the bottom. For this reason the ECD relay is supplied with a second loose
label with inverted text. This allows for easier identification and reading of the Relay’s status when installed upside down. To
install, apply the new label directly over the existing label.
Figure 1: Inverted ECD label
Ensure the existing label is clean by wiping all dirt and oils off. This will ensure that the
new label does not fall off.

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4ECD RELAY OVERVIEW
The ECD is an intrinsically safe electrical protection relay designed for operation in underground coal mining applications. It
provides earth continuity protection in accordance with AS/NZS 2081:2011 ensuring the integrity of the earth connection
through a trailing or reeling cable is maintained. Earth Continuity protection is another layer of protection that, along with earth
leakage protection, can help keep step and touch voltage potentials at a safe level by ensuring the earth resistance is below a
determined safe level.
The ECD relay is based on microprocessor digital logic, and features a user friendly LED and switch interface. It is installed
within a compact, DIN rail mounted unit with pluggable connectors that can easily be changed out in the event of a problem with
the relay.
The relay contains an internal IS barrier.
Key Features
•Compact size
•DIN rail mounted
•Simple wiring and installation
•6 settings for trip time
•6 settings for trip level
•AS/NZS 2081:2011 Compliant
•IEC 60079 Certification
•SIL2 Capable (See appendix B)
Typically the ECD relay will be connected to the pilot conductor of a trailing or reeling cable. With the pilot conductor terminated
to earth through a diode, the relay measures the resistance of the pilot-earth loop (series resistance), to ensure the integrity of
the earth conductors, and the pilot to earth resistance (shunt resistance), to ensure the integrity of the pilot-earth loop. If these
tests fail the ECD will trip, de-energising its output relay which can be used to switch a contactor, circuit breaker or for
signalling.
The ECD can be configured for latching or non-latching operation and has a remote start option.
The ECD relay can also be used as an IS interlock with the pilot terminal connected to a circuit that passes through interlocks
and switches.
CAUTION!
A safe resistance level for the pilot-earth loop should be determined by risk assessment
and analysis of the system.

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4.1 Mechanical Arrangement
4.1.1 Enclosure
The ECD is housed in a plastic enclosure and is rated IP20.
The dimensions are shown in Figure 2 below (117x45x114mm):
Figure 2: ECD enclosure dimensions
4.1.2 Mounting arrangement
The ECD enclosure is designed be mounted on a standard 35mm DIN rail.
The IS connections are located at the top of the enclosure and the non-IS connections (power and user inputs and outputs) are
located at the bottom of the enclosure.
The fascia of the relay includes two (2) adjustable DIP switches and two (2) rotary switches for configuration of relay settings
and five (5) indication LEDs to assist in fault finding.

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4.2 Electrical Connections
Once the ECD relay has been mounted at a suitable location, it is necessary to wire it correctly.
Figure 3 shows a typical wiring diagram for the application of the ECD relay. Also refer to drawing ECDM003 for installation
information.
N.O. USER
PUSHBUTTON
RST
PILOT
IS EARTH
IS EARTH
IS EARTH
+
-
D.C. SUPPLY
USER
DEFINED
SAFE AREA HAZARDOUS
AREA
SAFE AREA
OPTIONAL
STOP
DIODE
1000V, 1A
OPTIONAL
REMOTE
START
RESISTOR
100Ω
IS EARTH
BAR
MAIN EARTH
BAR
TERMINATION
EARTH BAR
Figure 3: ECD Typical Electrical Application
The table below lists the terminal connections into the ECD relay.
Terminal
Label
Description
1
RST
Reset
2
+
Power Supply Positive
3
-
Power Supply Negative
4
NC1
Relay Output Normally Closed Contact 1
5
NO1
Relay Output Normally Open Contact 1
6
COM1
Relay Output Common Contact 1
7
NO2
Relay Output Normally Open Contact 2
8
COM2
Relay Output Common Contact 2
9
NC
Not connected
10
NC
Not connected
11
NC
Not connected
12
NC
Not connected
13 Pilot
IS Pilot connection (protected by internal IS barrier) (Single core screened,
screen connected to earth at ECD end)
14
IS Earth
IS Earth
15
IS Earth
IS Earth
16
IS Earth
IS Earth
Using a screened cable helps in reducing the induced / coupled voltages. This noise
can cause spurious trips.

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Wherever a screened cable is to be connected to Earth, ensure that the screen is
earthed at ONE END ONLY, as near to the ECD as practicable.
4.2.1 Supply
The appropriate power supply is dependent on the ECD model. The ECD relay is available as either a 24Vdc ±20% or as a
48Vdc ±20% model.
4.2.2 Pilot Terminal
The pilot terminal is an IS terminal (protected by an internal IS barrier) through which the ECD performs resistance
measurements.
Typically the pilot terminal will be connected to the pilot conductor of a trailing or reeling cable. The load end of the pilot
conductor will then be terminated with a diode to earth, creating a return path through the earth conductors of the cable to the
main earth point of the outlet and then to the ECD’s IS earth terminals. The primary function of the ECD relay is to verify the
resistance of this pilot earth-loop is below a selectable level.
4.2.3 IS Earth Terminals
The IS earth terminals provide the earth connection for the ECD’s internal IS barrier as well as the earth reference for the pilot
resistance measurement. These terminals must be connected directly to the outlet’s main earth point by 3 x 1.5mm2 cables. No
other connections are permitted.
4.2.4 Reset - Optional
This is an active high input that allows ECD trips to be reset in latching mode, after the fault has been cleared. The reset input
has no affect in non-latching mode.
The Reset input should be connected to the ECD’s ‘+’ terminal via a normally open switch with a minimum rating of the supply
voltage.
4.2.5 Relay Contacts
The default position of the relay contacts (Normally Open or Normally Closed) is described on the ECD front label and Figure 3.
The relay contacts will change state when the ECD is started (Status LED flashing) and will return to the default state when the
ECD “trips”.
The relay contacts are rated for 1A @ 110Vac and 1A @ 30Vdc (Resistive).
4.2.6 External Fuse
The ECD’s IS Pilot Terminal is protected by an internal IS barrier. In the event of a phase to pilot fault this barrier will clamp the
voltage at the pilot terminal to a safe level and protect the relay from damage. However this barrier can only withstand 5.25A for
1s. The ECD relay must, therefore, be installed in a system with earth fault current limitation of 5A or less and an earth fault
clearance time of less than 1s. Alternatively a 3A external fuse rated to system voltage can be installed between the ECD’s pilot
terminal and the pilot conductor.
4.2.7 Stop Button - Optional
The stop button should be a normally closed switch installed in the pilot conductor. When opened, the ECD will detect an open
circuit pilot and trip on open circuit.
4.2.8 Start Button and Resistor - Optional
When remote start mode is selected a 100Ω, 1%, 5W resistor must be installed in series with the pilot conductor. The start
button is then installed in parallel to this resistor. The start button should be a normally open switch.

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5COMMISSIONING AND CALIBRATION
Prior to being put into service, the electrical protection system must be correctly commissioned. This manual does not cover
system commissioning; the full scope of commissioning tests should be determined during the risk assessment or FMEA
covering the design of the electrical protection system.
The following test can provide guidance on checking the correct operation of the ECD during commissioning. This is not
intended to provide an exhaustive commissioning checklist, but should be considered to be a minimum set of tests.
The Earth Continuity function performs two measurements to ensure the integrity of the pilot-earth loop; Series resistance
measurement and shunt resistance measurement.
5.1 Earth Continuity Test – Series Resistance
The series resistance measurement can be verified by installing a resistor which is a minimum of 3Ω above the selected trip
level, or creating an open circuit, in series with the pilot conductor and verifying that the ECD relay trips within the selected trip
time and indicates an open circuit fault.
5.2 Earth Continuity Test – Shunt Resistance
The shunt resistance measurement can be verified by installing a resistor which is 1kΩ or less, or creating a short circuit,
between the pilot conductor and earth, and verifying that the ECD relay trips within the selected trip time and indicates a short
circuit fault.
5.3 Remote Start Function
The remote start function can be verified by repeating the two previous tests in the remote start mode with the remote start
resistor installed.

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6AS/NZS 2081 PROTECTION FUNCTION: EARTH CONTINUITY
The primary function of the ECD relay is to provide Earth Continuity protection in accordance with AS/NZS 2081: 2011. This
protection ensures the integrity of the earth connection between an outlet and a load via the pilot conductor in the cable.
In a typical installation the ECD’s pilot terminal will be connected to the pilot conductor of a trailing or reeling cable. The load
end of the pilot conductor will then be terminated with a diode to earth, creating a return path through the earth conductors of
the cable to the main earth point of the outlet and then to the ECD’s IS earth terminals. The ECD measures the resistance of
this pilot-earth loop (series resistance) and the pilot resistance to earth (shunt resistance). If the pilot-earth loop is not healthy
(series resistance greater than the selected trip value or shunt resistance lower than 1.25kΩ), a trip occurs which de-energises
the output relay within the selected trip time.
The trip can be configured as latching or non-latching. This allows the user to choose if the trip is manually or automatically
reset once the pilot - earth loop is healthy.
CAUTION!
Cable parameters are important to the correct operation of the Pilot E/C function.
Resistance & capacitance values limit the length of cable that the relay can drive.
6.1 Series Resistance
The ECD relay measure the series resistance of the pilot-earth loop by applying a positive voltage to the pilot conductor and
measuring the pilot current. If the series resistance is detected to be above the user selected level, the ECD de-energises its
output relay and the LEDs on the front panel will indicate an open circuit fault. The pilot-earth loop resistance will still
continuously be monitored even in the event of a trip.
The ECD cannot be re-started until the fault has been cleared.
A power cycle will not reset the trip.
In non-latching mode, the ECD will automatically reset after the fault has been cleared.
In latching mode, a manual reset is needed after the fault has been cleared.
The trip level and time can be selected using the rotary switch on the front panel.
6.2 Shunt Resistance
The ECD measures the shunt resistance (pilot to earth) by applying a negative voltage to the pilot conductor and measuring the
pilot current. If the shunt resistance is detected to be below 1.25kΩ, the ECD’s output relay will be de-energised and the LEDs
on the front panel will indicate a short circuit fault. The shunt resistance will still continuously be monitored even in the event of
a trip.
The ECD cannot be re-started until the fault has been cleared.
A power cycle will not reset the relay.
In non-latching mode, the ECD will automatically reset after the fault has been cleared.
In latching mode, a manual reset is needed after the fault has been cleared.
The trip time can be selected using the rotary switch on the front panel.

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6.3 Remote Start
Remote start mode can be selected via the DIP switches at the front of the panel.
Switching to or from remote start mode while the power is applied will cause a trip (the
relay will de-energise and the Start Timed Out LED will come ON).
In remote start mode, a 100Ω resistor (1%, 5W) must be connected in series with the pilot circuit and a normally open button
connected in parallel to this resistor. The loop resistance of the circuit will then be 100Ω plus the resistance of the cable.
To start the ECD in remote start mode the following sequence must be followed:
1. All trips must be clear.
2. The start resistor must be detected in the pilot circuit.
3. The start button must be pressed for a minimum of 500ms.
4. The start button must be released within 15s or “Start Button timed out” trip will occur.
The start timed out fault is automatically reset once the start resistor is detected (A manual reset is not required).
6.4 Latching mode
Latching mode can be selected via the DIP switches at the front panel.
When a fault occurs in latching mode the trip will be latched, preventing the ECD from starting (even if the fault is cleared), until
a manual reset occurs.
In latching mode, if a fault occurs, the corresponding LED will be turned on and the trip
will be latched. If another fault occurs, while the previous trip is still latched, the LED
corresponding to that fault will flash.
6.5 Manual reset procedure
To use the reset function, the user must connect a switch (typically a NO momentary pushbutton) between the RST input and
the positive of the supply (see ‘Electrical Connections’ section 4.3 for more information).
In latching mode, the user must manually reset the unit after a fault has occurred. The procedure is as follows:
1. Clear the fault.
2. Press the reset button for a minimum of 500ms.

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7OPERATION SUMMARY
7.1 DIP Switches Configuration
7.1.1 Remote Start
Switch Position
Function
Off (left)
Remote Start disabled. A remote start button (with a 100Ω resistor) must not be installed
On (right)
Remote Start Enabled. A remote start button (with a 100Ω resistor) must be installed
7.1.2 Latching
Switch Position
Function
Off (left)
Latching mode disabled. Trips will be automatically reset after the fault has been cleared.
On (right)
Latching mode enabled. Trips must be manually reset after the fault has been cleared.
7.2 Rotary Switches Configuration
7.2.1 Trip Level selection
The user can select the trip level via one of the rotary switches at the front of the unit. The trip level represents the threshold
for the series resistance. If the resistance is measured to be greater than this threshold ±3Ω, a trip will occur. The allowed
values for the trip level setting are 10Ω, 15Ω, 20Ω, 25Ω, 35Ω, and 45Ω.
The shunt resistance trip level is fixed at 1.25kΩ. A trip will occur if the pilot to earth resistance is detected to be below
this level.
7.2.2 Trip Time Selection
The user can select the trip time via one of the rotary switches at the front of the unit. The trip time represents the delay
after which a trip condition has occurred when the ECD relay will de-energise. The allowed settings for the trip time are
50ms, 100ms, 200ms, 300ms, 400ms, and 500ms.
7.3 Indication LEDs
7.3.1 Status (Green)
LED state
Indication
Off
Power Off
Flashing
Power is ON and ECD is running (relay contacts switched to the non-default state)
On
Power is ON but ECD is not running (relay contacts in the default state)
7.3.2 Healthy (Green)
LED state
Indication
Off
Pilot is not healthy (series resistance above the selected setting or shunt resistance below
1.25kΩ)
Flashing
N/A
On
Pilot is healthy (series resistance below the selected setting and shunt resistance above
1.25kΩ)

Ampcontrol CSM Pty Ltd - ABN 35 000 770 141
ECD User Manual
Rev 3 – March 2020
ECDB005R0 13/03/2020 13:12 Page 18 of 21
7.3.3 Short Circuit (Red)
LED state
Indication
Off
Shunt resistance above 1.25kΩ
Flashing
Non-latch mode: Shunt resistance is below 1.25kΩ but for less than trip time setting
Latch mode: ECD has tripped on series resistance and shunt resistance is now below
1.25kΩ
On
Shunt resistance below 1.25kΩ
7.3.4 Open Circuit (Red)
LED state
Indication
Off
Series resistance is below trip setting
Flashing
Non-latch mode: Series resistance is above trip setting but for less than trip time setting
Latch mode: ECD has tripped on shunt resistance and series resistance is now above trip
setting
On
Series resistance is above trip setting
7.3.5 Start Timed Out (Red)
LED state
Indication
Off
Start button not pressed
Flashing
Start button is pressed
On
Start button has timed out (held down for more than 15s)
7.4 Fault Indication
CAUTION!
When an internal fault occurs, all the LEDs will be flashing together and the measurements
can no longer be trusted. A power cycle is needed to reset this state. If this happens
repetitively, please contact Ampcontrol as the unit may be damaged.
The ECD continuously checks the health of its internal circuitry. If these checks fail, the ECD will show an internal fault by
flashing all LEDs and returning the relay contacts to the default position.
7.5 Starting the ECD
When first powered, the ECD will begin checking its internal circuitry as well as the pilot circuit. If no faults are detected within
1.7s the ECD will be ready to start.
•If remote start mode is not selected the ECD will automatically start, energising its output relay.
•If remote start mode is selected the ECD will wait for the start button to be pressed.
After a trip has occurred and the fault cleared, the ECD can be reset and re-started depending on the configured modes:
Latching Mode
Remote Start
Mode
Starting the ECD
No
No
Automatic re-start 1s after the fault has been cleared.
No
Yes
Press the start button a minimum of 1s after the fault has been cleared.
Yes
No
Automatic re-start immediately after manual reset
Yes
Yes
Press the start button after manual reset

Ampcontrol CSM Pty Ltd - ABN 35 000 770 141
ECD User Manual
Rev 3 – March 2020
ECDB005R0 13/03/2020 13:12 Page 19 of 21
8SERVICE, MAINTENANCE & DISPOSAL
8.1 Equipment Service
The ECD requires no internal servicing during its normal operating life. A number of external system based checks should
however be completed on a regular basis. These ‘routine inspections’ must be carried out by suitably trained people with
knowledge of the ECD and the systems into which it is fitted. Routine inspections may take the form of either visual-only
checks, or visual and ‘hands-on’ checks.
8.1.1 Visual Only Inspections
A basic visual inspection focuses on looking at the installation for signs of physical damage, water or dust ingress and the
condition of cables and labels. This type of inspection may involve opening cabinets to gain access to the ECD and other
equipment. This level of inspection may also include cleaning display windows that have become obscured by dirt.
Observations would typically be:
•Check that equipment enclosures, cable trays, conduits, etc. are in good order with no physical damage.
•Check that sealed wall boxes are free from water and dust ingress internally. Door seals are in good condition.
•Check that connected cables are free from cuts, abrasions and obvious signs of damage. Cable restraints are in good
order and correctly fitted.
•Check that labels on equipment, wall boxes and cables are present and in good condition (especially certification
labels).
•Check that no modifications have been carried out to installed equipment.
8.1.2 Hands-On (Detailed) Inspections
A more detailed inspection would include all of the elements of a visual inspection, plus some checks that cover the integrity of
connections, fixtures and fittings.
In addition to basic visual observations, more detailed integrity checks would involve:
•Verify that equipment housings, wall boxes and other mechanical fixtures are secured in place. This includes terminal
box lids, tightness of cable glands, integrity of wall-box mountings, security of equipment fixing to walls/ DIN rails etc.
•Verify all electrical connections are secure with no loose screw terminals or DIN rail terminals not fitted to rails etc.
8.2 Equipment Maintenance
WARNING!
The ECD Relay has no user-serviceable parts. All repairs must be carried out by
Ampcontrol only. If a fault develops, return the ECD to Ampcontrol for repair. It is
essential that no attempt be made to repair the ECD as any attempt to dismantle or
repair the ECD can seriously compromise the safety of the unit.
It is recommended that the electrical protection system incorporating the ECD be subject to regular functional tests at intervals
determined by risk assessment or FMEA. These intervals typically coincide with periodic maintenance checks and will cover
(but not limited to) tests such as earth continuity tests.
8.3 Disposal
The electronic equipment discussed in this manual must not be treated as general
waste. By ensuring that this product is disposed of correctly you will be helping to
prevent potentially negative consequences for the environment and human health
which could otherwise be caused by incorrect waste handling of this product.

Ampcontrol CSM Pty Ltd - ABN 35 000 770 141
ECD User Manual
Rev 3 – March 2020
ECDB005R0 13/03/2020 13:12 Page 20 of 21
9SPECIFICATIONS
Certificates/Approvals
Type
[Ex ia] I - for use in non-hazardous area only
Certificate Number
IECEx TSA 13.0004X
IS Parameters – Non-IS Terminals
Um
132V rms phase to earth
IS Parameters – On the blue coloured terminals providing the output for the Pilot/Earth Line
When Pilot/Earth Line is considered intrinsically safe
Uo
28V
Io
184mA
Po
1.28W
Co
2.0uF*
Lo
10.0mH*
* The load can have the above Co as a lumped value provided the Lo is < 1%, or it can have the
above Lo as a lumped value provided the Co is <1%.
Optionally, the load can have the full value of Co and Lo if distributed as in a cable.
When Pilot/Earth Line is not considered intrinsically safe
Im
5.25A for 1s
Environmental Conditions
Temperature Range
-20°C ≤ Ta ≤ 65°C
Supply Voltage
24V Model
24Vdc ± 20%, 5W
48V Model
48Vdc ± 20%, 5W
Relay Contacts
Contacts
2 x NO / 1 x NC / 2 x COM
Ratings
1A @ 110Vac – 1A @ 30Vdc (Resistive)
Earth Continuity Protection: AS/NZS 2081: 2011
Series Resistance Trip
Settings (± 3Ω)
10Ω, 15Ω, 20Ω, 25Ω, 35Ω, 45Ω
Shunt Resistance
1.25kΩ
Trip Time Settings
50ms, 100ms, 200ms, 300ms, 400ms, 500ms
Pilot Measurement Voltage
±24Vdc
Optional Start Button
100Ω, 1%, 5W
Mechanical
Dimensions
117x45x114mm
Weight
503g
IP Rating
IP20