Ampcontrol CSM Pty Ltd -
ABN 35 000 770 141
ECD User Manual
Rev 3 – March 2020
ECDB005R0
13/03/2020 13:12
Page 10 of 21
4
ECD 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.
Summary of Contents for ECD
Page 22: ...APPENDIX A DRAWINGS ...
Page 24: ...APPENDIX B APPROVALS ...