TCS-Supervision Module – Trip Circuit Supervision [74TC]
Commissioning: Trip Circuit Supervision [74TC]
For CBs that trip by means of little energy (e.g. via an optocoupler), it has
to be ensured that the current applied by the digital inputs will not cause
false tripping of the CB.
Object to be tested
Test of the trip circuit supervision.
Procedure, part 1
Simulate failure of the control voltage in the power circuits.
Successful test result, part 1
After expiry of
»t-TCS«
the
trip circuit supervision
TCS
of the device should signal an alarm.
Procedure, part 2
Simulate a broken cable in the CB control circuit.
Successful test result, part 2
After expiry of
»t-TCS«
the
trip circuit supervision
TCS
of the device should signal an alarm.
Page 288
EN MRU4 10/09
