ABB RELION 620 Series Technical Manual page 585

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1MAC504801-IB E

620 series ANSI

Technical Manual

A070785-ANSI V1 EN

Functional module diagram

This module receives the trip circuit status from the hardware. A detected failure in the trip

circuit activates the timer.

Once activated, the timer runs until the set value Trip delay time is elapsed. The time

characteristic is according to DT. When the operation timer has reached the maximum

time value, the ALARM output is activated. If a drop-off situation occurs during the trip

time up counting, the reset timer is activated. If the drop-off time exceeds Reset delay

time, the trip timer is reset.

The BLOCK input can be controlled with a binary input, a horizontal communication input

or an internal signal of the relay program. The activation of the BLOCK input prevents the

ALARM output to be activated.

TCM detects faults in the electrical control circuit of the circuit breaker. The function can

supervise both open and closed coil circuits. This supervision is necessary to find out the

vitality of the control circuits continuously.

shows an application of the trip circuit supervision function use. The best

solution is to connect an external R

internal contact. Although the circuit breaker internal contact is open, TCM can see the

trip circuit through R

through the resistance remains small, that is, it does not harm or overload the circuit

breaker's trip coil.

shunt resistor in parallel with the circuit breaker

resistor should have such a resistance that the current

Supervision functions

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