The method used is called pilot earth loop or earth continuity monitoring where an additional core pilot cable is included with the power and earth cores in the trailing or reeling cables which supply power to the machines.
Earth continuity relay function.
This relay is micro processor controlled and can withstand high induced ac voltages and injected dc voltages.
This allows non flameproof switches to be used in hazardous areas.
The relay is normally installed in a substation or flameproof enclosure to provide earth continuity protection.
The loop resistance is constantly indicated on a 7 segment lcd display.
Ensures that there is an earth return path from the machine back to the substation and or distribution box.
Earth continuity relays prefixed gcm.
It drives the hmi display interface edm and is also in control of the main circuit breaker.
The method used is called pilot earth loop or earth continuity.
In fact if the motor was running it would become impossible to stop it using the pilot switch.
Our latest offering the pf1 relay performs two standard electrical protection functions.
The trip level can be set using the rotary switches on the front panel.
The relay can also as be used as a standard on off control connected to two wires or connected to a pilot and earth of a cable.
It performs the as nzs 2081 2011 earth continuity protection function on the outlet as well as receive and process the signals from the power interface.
The relay monitors the return path resistance between pilot and earth of the cable.
The ecm2 earth continuity relay performs the following functions.
A typical example is a pump float switch.
Earth leakage and earth continuity as well as pump and fan protection.
When short circuit between the pilot and earth cores in the trailing cable completes the circuit through the operating relay and if the pilot circuit were not to fail to safety such a fault would cause the motor to start immediately.
The pilot conductor is connected through an ep041 barrier into the hazardous zone.
This is typically achieved using an earth continuity protection relay to apply a low voltage dc signal between the pilot and earth of the cable.
An earth continuity relay is designed to provide earth continuity protection.
