ComAp InteliATS NT STD Reference Manual page 8

Open Delay Transition functional diagram..
H :
INT
This transition can perform fastest possible changeover if Transfer Del is set to zero value.
Overall blackout time then equals to 20 ms + breaker reaction time.
H :
INT
Use longer delay time to avoid problems with motor starters. (Motor starts prefer to see break of a few
seconds so they can initialize properly).
H :
INT
To avoid issues with contactor mechanical interlocks use delay 0.75s or longer (mech. interlock on
contactors takes some time to clear). If you try to close one contactor before interlock has cleared it
can jam and you end up with out supply to load).
NT
InteliATS STD, SW version 2.0, ©ComAp – June 2010
IA-NT- STD-2.0-Reference Guide.pdf
8