Functionality - ABB 615 series Technical Manual

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1MAC059074-MB A

615 series ANSI

Technical Manual

Functionality

An emergency condition can arise in cases where the motor needs to be started despite

knowing that this can increase the temperature above limits or cause a thermal overload

that can damage the motor. The emergency start-up function 62EST allows motor start-

ups during such emergency conditions. 62EST is only to force the protection relay to

allow the restarting of the motor. After the emergency start input is activated, the motor

can be started normally. 62EST itself does not actually restart the motor.

The function contains a blocking functionality. It is possible to block function outputs,

timer or the function itself, if desired.

Operation principle

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

parameter values are "Enable" and "Disable".

The operation of 62EST can be described using a module diagram. All the modules in the

diagram are explained in the next sections.

GUID-18128621-4A78-45D0-A788-9116B5213449 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 condition.

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

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