Ampcontrol CSM Pty Ltd - ABN 35 000 770 141
ECDB006 MEC-1 User Manual
MEC-1 USER MANUAL R0 13/03/2020 13:16 Page 8 of 18
4 MEC-1 RELAY OVERVIEW
The MEC-1 is an electrical protection relay designed for operation in metalliferous 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 MEC-1 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.
Key Features
• Compact size
• DIN rail mounted
• Simple wiring and installation
• Six (6) settings for trip time
• Six (6) settings for trip level
• AS/NZS 2081:2011 Compliant
Typically the MEC-1 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 MEC-1 will trip, de-energising its output relay which can be used to switch a contactor, circuit breaker
or for signalling.
The MEC-1 can be configured for latching or non-latching operation and has a remote start option.
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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