FANOX SIL-A A Series, User Manual

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4.2 Function SOTF. Switch On To Fault
This protection function can be set by using the following parameters:
Function Description Minimum Maximum Step Unit Default
SOTF (*)
Switch On To Fault
Function Enable - - No/Alarm/Trip/SHB Trip - No
Current Tap 0.010 30.000 0.001 xIn 5.000
Time Delay 0.000 300.000 0.001 s 0.050
Safe Time 0.000 300.000 0.001 s 2.000
(*) Optional depending on model
When the logic signal ‘ SOFT Start ’ is activated, it starts the pickup of the function. This protection is
provided for high speed clearance of detected fault immediately after Manual Closure of Circuit Breaker
or any other conditions selectable through the logical signal.
The function is active during the time adjusted in Safe Time and this setting must be coordinated with
the Time delay in order to allow the correct behavior of the function.
The time delay is independent from the operating current flowing through the relay, so if the phase
current exceeds its predetermined value for an equal or greater amount of time than this preset value,
the protection function activates (trips) and does not reset itself until the average value of the phase
drops below the point of current pick-up. The function activates at 100% of the preset input and
deactivates at 95%. The reset is instantaneous.
The accuracy of the Time Delay is equal to the set time delay ±35ms or ±0.5% (whichever is greater).