Application - ABB 615 series Technical Manual

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1MAC059074-MB A

SOTF Group settings (Basic)

Values (Range)

Trip delay time

615 series ANSI

Technical Manual

SOTF control

The SOTF control is activated when CB_CL_CMD circuit breaker closing command input

is activated. The module is kept active until the set SOTF reset time is exceeded after the

CB_CL_CMD is deactivated. The TRIP output is activated when a fault indication signal

is received from the Trigger module while the SOTF control is still active.

Application

The CB_CL_CMD input activates SOTF. In the standard configuration, the breaker close

command should be connected to this input. The SOTF reset time setting parameter is used

for keeping SOTF active for a certain time after the CB close command is executed.

The overcurrent high and instantaneous signals, for example, the 50P-3 PICKUP signal is

connected to the function PICKUP input. When the SOTF control module is active and the

PICKUP input is activated, the function trips instantaneously without any delays.

The overcurrent low stage signals, for example, 51P PICKUP signal is connected to the

function PICKUP_DLYD input. The setting parameter Trip delay time is used to delay the

operation in case of inrush situation.

SOTF Input signals

SOTF Output signals

Protection related functions

Pickup from function to be accelerated by SOTF

Pickup from function to be accelerated with delay by

External enabling of SOTF by CB close command

Block of function

Time delay for pickup input

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