InteliATS
NT
PWR, SW version 2.5, ©ComAp – May 2015 60
IA-NT- PWR-2.5-Reference Guide.pdf
HINT:
Breaker delay default value for both breakers (MCB Delay, GCB Delay) is set to 50ms. ATS switch
delay consists of both delays.
3. Closed Transition
Closed Transition presents transition type where both breakers/contactors overlap for 100 ms and
transition initiates only when both power sources are in sync. This kind of transition is suitable for
such systems where no break (no blackout) changeover is required. Transfer Del setpoint value
is ignored (equals to zero).
See description of passive synchronization for more info.
Two independent breakers/contactors are required as switching elements. Reaction time of whole
switching mechanism (including control relays) affects overall changeover time.
It is required to use as fast switches as possible (breaker opening time < 100 ms
including control relay). If parallel run exceeds 200 ms both breakers are opened
and alarm is activated. If parallel run still continues (breakers are closed for at
least 100 additional milliseconds), binary output Shunt Trip is activated (if
configured).
HINT:
It is necessary to use fast breakers with known closing/opening time when Closed Transition takes
place. Breaker switching time is used as parameter (MCB Delay / GCB Delay) for
calculation/prediction of exact in-sync moment.
HINT:
In case of source (e.g. mains) failure changeover from source is always performed as open
delayed, not as closed.
HINT:
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