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1. 04:14 PM - Re: Switch Question (farmrjohn)
2. 04:29 PM - Re: Switch Question (user9253)
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| Subject: | Re: Switch Question |
Reviving an old thread, when the original generator was swapped out for an alternator
they utilizedg only one pole of the two pole switch to connect the batter
to the bus, leaving the other side unused. Would it be possible to utilize
the unused poles to control a master contractor leaving the heavy wiring from
the batter to the switch in place? That way when the switch was closed it would
energize the contractor and allow the connection to the bus, and provide a
backup method of disconnecting the battery should the contractor fail closed
for any reason. This is in anticipation of pursuing a field approval for a contacor.
Thanks, John
nuckolls.bob(at)aeroelect wrote:
> At 03:41 PM 11/24/2020, you wrote:
>
> > At 10:33 AM 11/24/2020, you wrote:
> >
> > >
> > > My master switch is specified as an AN 3023-2. I have been unable to find
any documentation on just what that is, other than some type of DPST switch.
Is there a source for decoding the AN switch specifications?
> > >
> >
> > That is a vintage switch dating back to the 40's or earlier.
> > It's reminiscent of the master switch in a Piper TriPacer
> > I took dual in wwwaayyy back when. BEEFY switch, no battery
> > master relay.
> >
> > They're still available as you can see here . . .
> >
> > https://tinyurl.com/y57x62bp (https://tinyurl.com/y57x62bp)
> >
> > What's your application?
> >
> >
>
> P.S. I have confirmed that this switch was used on
> Univair (ERCO) aircraft as the primary current
> carrying device for ship's power. This IS a high
> current switch . . . probably rated at 30A or more.
>
> If that's how it's used in your application, suggest
> you add a battery master contactor thus allowing
> substitution of a friendlier toggle switch.
>
>
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=512785#512785
Message 2
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| Subject: | Re: Switch Question |
Contactors are unlikely to fail closed. I would remove existing cables
between the battery and main power bus. Then install a contactor
between the battery and bus.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=512786#512786
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