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.
5.8.5 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.
5.8.6 Signals
Table 726: SOTF Input signals
Name
Type Default Description
PICKUP BOOLEAN 0=False Pickup from function to be accelerated by SOTF
PICKUP_DLYD BOOLEAN 0=False Pickup from function to be accelerated with delay by
SOTF
CB_CL_CMD BOOLEAN 0=False External enabling of SOTF by CB close command
BLOCK BOOLEAN 0=False Block of function
Table 727: SOTF Output signals
Name
Type Description
TRIP BOOLEAN Trip
5.8.7 Settings
Table 728: SOTF Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Trip delay time 0...60000 ms 1 0 Time delay for pickup input
1MAC059074-MB A Section 5
Protection related functions
615 series ANSI 833
Technical Manual
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