Operation Principle - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

Analog inputs

See the preprocessing function blocks in this document for the

possible signal sources.

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings. For

troubleshooting, check the contents of this chapter and also the preprocessing blocks

in this document. The configuration can be written to the protection relay once the

mismatch is corrected.

Operation principle

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "On" and "Off".

The operation of ESMGAPC can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

GUID-D0447355-E16A-4A78-A756-E11503853C58 V1 EN

Functional module diagram

Standstill detector

The module detects if the motor is in a standstill condition. The standstill condition

can be detected based on the phase current values. If all three phase currents are below

the set value of Motor standstill A, the motor is considered to be in a standstill

The timer is a fixed 10-minute timer that is activated when the ST_EMERG_RQ input

is activated and motor standstill condition is fulfilled. Thus, the activation of the

ST_EMERG_RQ input activates the ST_EMERG_ENA output, provided that the motor

is in a standstill condition. The ST_EMERG_ENA output remains active for 10

minutes or as long as the ST_EMERG_RQ input is high, whichever takes longer.

The activation of the BLOCK input blocks and also resets the timer.

Protection related functions

Three-phase currents

ST_EMERG_ENA

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