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Re: Auto transfer switch [message #348095 is a reply to message #347853]

Wed, 18 September 2019 13:01

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

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Senior Member

We differ on a couple of points. What's the minimum disruption your A/C will recognize as a power drop? What's the minimum time for your source relay to pull in? If the second is lower than the first and if the two sources are out of phase, you'll take a breaker or fuse down. Realize, transfer is not a problem, in that you're leaving a dead source. Retransfer however can bite you since you're switching between two live sources and don't know the phase relationship between them.
Back in The Day the gensets had 'parallelling' lights, simply lights connected across the A phase of both sources. Throw the switch when the lights go out. To automate this we hung a relay across the lights and let it inhibit the transfer switch motor when it was energized. This got the transfer to within 30 degrees or so of equal which didn't hurt anything. The option was/is a trip to the plant, usually in a storm.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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[Message index]

		Auto transfer switch By: 6cuda6 on Sun, 15 September 2019 09:54
		Re: [GMCnet] Auto transfer switch By: Richard Denney on Sun, 15 September 2019 11:07
		Re: Auto transfer switch By: JohnL455 on Sun, 15 September 2019 11:38
		Re: Auto transfer switch By: mghamms on Sun, 15 September 2019 13:48
		Re: Auto transfer switch By: 6cuda6 on Sun, 15 September 2019 13:55
		Re: Auto transfer switch By: C Boyd on Sun, 15 September 2019 14:50
		Re: Auto transfer switch By: mghamms on Sun, 15 September 2019 15:21
		Re: Auto transfer switch By: 6cuda6 on Sun, 15 September 2019 15:28
		Re: [GMCnet] Auto transfer switch By: James Hupy on Sun, 15 September 2019 15:41
		Re: [GMCnet] Auto transfer switch By: Olly Schmidt on Sun, 15 September 2019 15:33
		Re: Auto transfer switch By: jhbridges on Sun, 15 September 2019 18:54
		Re: [GMCnet] Auto transfer switch By: James Hupy on Sun, 15 September 2019 19:09
		Re: Auto transfer switch By: TR 1 on Tue, 17 September 2019 09:59
		Re: Auto transfer switch By: jhbridges on Tue, 17 September 2019 10:09
		Re: Auto transfer switch By: jhbridges on Tue, 17 September 2019 10:10
		Re: Auto transfer switch By: Larry on Tue, 17 September 2019 12:09
		Re: Auto transfer switch By: habbyguy on Tue, 17 September 2019 13:32
		Re: Auto transfer switch By: ljdavick on Tue, 17 September 2019 15:02
		Re: Auto transfer switch By: Russell K. on Tue, 17 September 2019 16:22
		Re: Auto transfer switch By: Tilerpep on Tue, 17 September 2019 19:27
		Re: Auto transfer switch By: 6cuda6 on Tue, 17 September 2019 19:52
		Re: Auto transfer switch By: jhbridges on Wed, 18 September 2019 08:03
		Re: [GMCnet] Auto transfer switch By: powwerjon on Wed, 18 September 2019 09:19
		Re: Auto transfer switch By: jhbridges on Wed, 18 September 2019 13:01
		Re: [GMCnet] Auto transfer switch By: Richard Denney on Wed, 18 September 2019 13:27
		Re: Auto transfer switch By: jhbridges on Wed, 18 September 2019 17:20
		Re: [GMCnet] Auto transfer switch By: Ken Henderson on Wed, 18 September 2019 17:45
		Re: [GMCnet] Auto transfer switch By: habbyguy on Thu, 19 September 2019 15:28

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