Woodward MRM4, Manual, Page: 408 / 460

Supervision
Name Description
I2>[2].TripCmd Signal: Trip Command
These trips will start the BF module if external trips have been selected as the trigger event.
Name Description
-.- No assignment
ExP[1].TripCmd Signal: Trip Command
ExP[2].TripCmd Signal: Trip Command
ExP[3].TripCmd Signal: Trip Command
ExP[4].TripCmd Signal: Trip Command
Commissioning: Circuit Breaker Failure Protection
The time that is configured for the BF MUST NOT be below the breaker
control time, otherwise an unwanted operation of the BF is caused by any
protective trip.
Object to Be Tested:
Test of the breaker failure protection.
Necessary Means:
•
Current source;
•
Ammeter; and
•
Timer.
When testing, the applied test current must always be higher than the
tripping threshold
»I-CBF« . If the test current falls below the threshold
while the breaker is in the “Off” position, no pickup will be generated.
Procedure (Single-Phase):
For testing the tripping time of the CBF protection, a test current has to be higher than the threshold value of one
of the current protection modules that are assigned to trigger the CBF protection. The CBF trip delay can be
measured from the time when one of the triggering inputs becomes active to the time when the CBF protection
trip is asserted.
To avoid wiring errors, checked to make sure the breaker in the upstream system switches off.
The time, measured by the timer, should be in line with the specified tolerances.
Re-connect the control cable to the breaker!
Successful Test Result:
The actual times measured comply with the set point times. The breaker in the higher-level section switches off.
Page 408 EN MRM4 01/11