InteliLite 9 Global Guide
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the Wrn MCB Fail (page 366) alarm: MCB Opens On (page 207) = Mains Fail, Mains < > Voltage Delay (page
203) ≤ 1.
If a 230 V motor driven circuit breaker is used on the MCB position and an undervoltage coil is not fitted, it is
not possible to open the breaker after the mains have failed, because there is no power for the motor drive
until the gen-set is started and providing voltage. Adjusting the setpoint MCB Opens On (page 207) = Gen Run
will prevent triggering the Wrn MCB Fail (page 366) alarm.
Breaker fail detection
Breaker fail detection is based on binary output breaker close/open comparing with binary input breaker
feedback.
IMPORTANT: It is necessary to configure breaker feedback to use this function.
IMPORTANT: Also it is possible to use breakers without feedbacks. In this case there is no check
of breaker real state.
There are three different time delays for breaker fail detection – see following diagrams.
When binary output breaker close/open is in steady state and breaker feedback is changed the breaker fail is
detected immediately (no delay).
Image 5.16 Breaker fail - breaker close/open in steady position - open
Image 5.17 Breaker fail - breaker close/open in steady position - close
When binary output breaker close/open opens there is 2 sec delay for breaker fail detection.
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