FANOX SIL-D00, User Manual, Page: 38 / 226

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4.8. Function 50BF. Circuit Breaker opening failure
This function settings are as follows:
Group Description Minimum Maximum Step Unit Default
50BF
Circuit breaker opening fault
Permission - - Yes/No - No
Opening fault time 0.02 1.00 0.01 s 0.2
The following automaton describes the open fault function:
When the “50BF init” status is activated, a switch is made to the "50BF init" and time is counted.
If, following the adjusted open fault time, the switch is not detected to have open, the function
trips. The function is reset when the circuit breaker
is detected to have opened, and the “50BF
init
” status has been reset.
To monitor the circuit breaker opening the current measurement via the three phases is used.
When the current via the three phases is less than 8% of the rated current, the circuit breaker is
considered to be open.
There is a signal
“50BF init” to start the open fault from an external protection. The “50BF init” is
configurable by user. The default configuration is shown below:
•
General trip
Run
Pickup
INIT_50BF = 1
Reset
t >
Imax< 8% Inominal
Imax< 8% Inominal
Imax< 8% Inominal
INIT_50BF = 0
50BF
Trip
50BF
50BF