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Alternator OV disconnect

 
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roughleg(at)gmail.com
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PostPosted: Sun Oct 21, 2018 7:02 pm    Post subject: Alternator OV disconnect Reply with quote

In the (British) Light Aircraft Association’s technical leaflet on electrical systems it says it’s better to disconnect a permanent-magnet alternator by interrupting the AC going into the regulator than the DC output from the regulator. The Z diagrams that include PM alternators seem to show the OV relay downstream of the regulator. Any thoughts on this?
Pat


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user9253



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Location: Riley TWP Michigan

PostPosted: Mon Oct 22, 2018 4:46 am    Post subject: Re: Alternator OV disconnect Reply with quote

Z-16 has the relay interrupting the dynamo AC. So the relay could interrupt either the AC or DC. If the voltage rectifier/regulator were smoking, then interrupting the AC would be better. Other than that, either way should be OK.

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yellowduckduo(at)gmail.co
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PostPosted: Mon Oct 22, 2018 6:17 am    Post subject: Alternator OV disconnect Reply with quote

Yes and interupting AC allows a smaller less robust relay than what is
required to reliably interupt DC current.  Rectifier/regulators smoke
just often enough that I use an OV/On Off  relay (forward of firewall)
on the AC supply to it and a C/B near the battery to limit current from
the battery.  There has been some discussion in the past on this.
Ken

On 22/10/2018 8:46 AM, user9253 wrote:
Quote:


Z-16 has the relay interrupting the dynamo AC. So the relay could interrupt either the AC or DC. If the voltage rectifier/regulator were smoking, then interrupting the AC would be better. Other than that, either way should be OK.

--------
Joe Gores


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nuckolls.bob(at)aeroelect
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PostPosted: Mon Oct 22, 2018 8:16 am    Post subject: Alternator OV disconnect Reply with quote

At 10:01 PM 10/21/2018, you wrote:
Quote:
In the (British) Light Aircraft Association’s technical leaflet on electrical systems it says it’s better to disconnect a permanent-magnet alternator by interrupting the AC going into the regulator than the DC output from the regulator. The Z diagrams that include PM alternators seem to show the OV relay downstream of the regulator. Any thoughts on this?


I posited that notion some years ago and began to
incorporate that philosophy as the z-figures were
updated . . . See Z16.

Hmmm . . . just updated Z20 and didn't get that
feature incorporated.

Either way, it's not a really big deal but yes,
breaking the AC leads from the PM alternator
is a bit more 'sanitary' . . .

Back to the cad screen . . .


Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Mon Oct 22, 2018 8:48 am    Post subject: Alternator OV disconnect Reply with quote

Quote:
Back to the cad screen . . .


Fixed it . . .



Bob . . .


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