trip setting for ATS
trip setting for ATS
(OP)
quick and silly question:
who determines and how do you determine the trip setting for an ATS? The ATS already has been selected, sized and specified with the proper breaker rating.
This question came up during activation of the generator becasue the ATS tripped when certain procedures took place.
Regards
who determines and how do you determine the trip setting for an ATS? The ATS already has been selected, sized and specified with the proper breaker rating.
This question came up during activation of the generator becasue the ATS tripped when certain procedures took place.
Regards
Lutfi
www.cdeco.com






RE: trip setting for ATS
What "certain procedures" cause the trip? What other procedures do not cause a trip?
Can you be more specific about the installation, loads, ATS rating, configuration, etc.?
RE: trip setting for ATS
RE: trip setting for ATS
In case of one generator and one ATS you may consider the following:
"Start time delay: Three seconds (prevents nuisance generator set starts during momentary utility power variations). Transfer time delay: Three seconds (allows generator set to stabilize before load is applied). Retransfer time delay: Five minutes (prevents needless power interruption if return of utility power is momentary. Stop time delay: Five minutes (allows gradual generator set cool down) ".
RE: trip setting for ATS
If you have a close transition and during retransfer the ATS will often shunt a breaker if it is in parallel too long.
Usually this is done by shunt tripping the generator mounted breaker.
RE: trip setting for ATS
Good luck with your project.