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roughleg(at)gmail.com
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 Posted: Sun Oct 21, 2018 7:02 pm Post subject: Alternator OV disconnect |
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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
Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan
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| Posted: Mon Oct 22, 2018 4:46 am Post subject: Re: Alternator OV disconnect |
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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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Joe Gores |
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yellowduckduo(at)gmail.co
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| Posted: Mon Oct 22, 2018 6:17 am Post subject: Alternator OV disconnect |
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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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=483930#483930
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 22, 2018 8:16 am Post subject: Alternator OV disconnect |
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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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| Posted: Mon Oct 22, 2018 8:48 am Post subject: Alternator OV disconnect |
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| Quote: | Back to the cad screen . . .
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Fixed it . . .
Bob . . .
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