ComAp InteliLite 4 AMF 20, Global Manual

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InteliLite4 AMF20 Global Guide
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Image 5.19 Breaker control outputs
MCB special requirements
If a contactor is used on the MCB position, it is recommended that the wiring be provided in such a way
that the contactor will be normally closed and will open if the logical binary output MCB C
LOSE
/O
PEN
(
PAGE
490) is activated. This behavior is called "negative logic" and can be adjusted by the setpoint MCB
Logic (page 281) . The negative logic will prevent accidental opening of the MCB when the controller is
switched off.
If a contactor is used on the MCB position, it will open itself immediately after the mains have failed,
because it will lose power to the coil. That is why the following adjustment is necessary to prevent
triggering the Wrn MCB Fail (page 539) alarm: MCB Opens On (page 283) = Mains Fail, Mains
Undervoltage Delay (page 276) ≤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
283) = Gen Run will prevent triggering the Wrn MCB Fail (page 539) alarm.
Breaker failure 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: If a breaker feedback is configured, it will be required all the time. Otherwise alarms
will be issued.
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 failure detection – see following diagrams.