Compressor In-rush During ATS Transfer

[ATSman]

Since this condition only occurs during testing when both utility and Generator power is on, why can't you just shut down the compressors. During a normal utility outage this wouldn't be an issue. I don't see how using a closed transition would be effective unless a pending power loss was anticipated and the generators were spun up in advance.

Just out of curiosity, what kind of compressor Motors are we talking about? These aren't maglev Motors or anything like that are they?

Closed transition only operates an a hot bus - hot bus transfer, i.e. during a test from the controller touchpad or during retransfer to normal after a power outage. A CT transfer switch would definitely solve the problem since the transfer sine-wave is seamless but would be much more expensive on a 1200A switch than activating and wiring in the motor load disconnect with the existing ATS.

 

[ron]

Ok, but you are not "modifying" anything in the ATS. You are simply using the the available presignal/ motor disconnect feature of the controller that is normally applied to this application to solve a specific problem.
Sounds like you have a "mindset education" problem rather than a technical problem.

True

rlundsrud[/COLOR]]
why can't you just shut down the compressors

Politics

 

[Russs57]

I’d get with whoever made the air compressor. Could be that something needs to be added to unload the head of the compressor. If it being done by the pressure switch you going to have a problem.

The AHJ where I am wouldn’t accept testing the generators in that manner.

 

[retirede]

I’d get with whoever made the air compressor. Could be that something needs to be added to unload the head of the compressor. If it being done by the pressure switch you going to have a problem.

The AHJ where I am wouldn’t accept testing the generators in that manner.

See the first paragraph of post 6. The load state of the compressor is likely irrelevant.