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Re: [GMCnet] Auto transfer switch [message #348097 is a reply to message #348095] Wed, 18 September 2019 13:27 Go to previous messageGo to previous message
Richard Denney is currently offline  Richard Denney   United States
Messages: 920
Registered: April 2010
Karma:
Senior Member
But that isn’t the reason for the 30-second delay. The transfer switch
doesn’t turn shore power off, delay for 30 seconds, and then connect to the
genset. It waits 30 seconds, and then switches the relays/contactors
directly from shore power to genset, just as it switches the reverse
directly when the genset is turned off.

If the relay switching time isn’t enough to handle the phase relationship,
oh well. It’s wise to shut off the air conditioner before switching between
two live loads.

The delay is there to let the engine on the genset stabilize before
imposing a load.

Rick “fulfilling a different requirement” Denney

On Wed, Sep 18, 2019 at 2:04 PM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:

> 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.
>
--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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