FANOX SIL-G, User Manual

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If the unit operates as defined time, the accuracy of the Time Delay is equal to the set time delay ±35ms
or ±0.5% (whichever is greater).
If a curve is selected for the curve setting, the accuracy of the time delay is equal to the theoretical time
±30ms or ±5% (whichever is greater).
The curves used are IEC 60255-151 and IEEE, which are described in the corresponding section.
4.9 Function 46BC. Broken conductor detection
This protection function can be set by using the following parameters:
Function Description Minimum Maximum Step Unit Default
46BC
Broken conductor protection
Function Enable - - No/Alarm/Trip - No
Tap 15 100 1 % 50
Operating time 0.030 300.000 0.001 s 0.200
This protection detects the percentage phase unbalance due to an open phase condition. It considers
the measurement I2/I1 in percentage.
If the measured relation between I2 and I1 is higher (in percentage) than the setting in the function
during the adjusted time, the function will trip.
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 ±30ms or ±0.5% (whichever is greater).
4.10 Function 49. Thermal Overload
This protection function can be set by using the following parameters:
Function Description Minimum Maximum Step Unit Default
49 Thermal image
Function Enable - - No/Alarm/Trip - No
Current Tap 0.100 2.400 0.001 xIn 1.200
ζ Heating constant 3 600 1 min 3
Cooling constant 1 6 1 ζ heating 1
Alarm 20 99 1 % 80
Thermal image is a measurement of heating and cooling of an electric machine. Contrary to an
overcurrent protection time is not counted when a fault is detected. It continues calculating the thermal
status of the monitored machine. Tripping time depends on adjusted thermal constants, operative
current and previous thermal status of the machine.