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nuckolls.bob(at)aeroelect
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 Posted: Mon Aug 23, 2010 8:38 pm Post subject: B&C alt voltage goes right up to 16V |
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At 10:23 PM 8/22/2010, you wrote:
| Quote: |
I installed a b&c alt on an o200 with the PMR1C-14. After about 10
hrs on it with no problems one morning, after the airplane sat out
in the rain, the voltage started going right up to 16V at takeoff
power tripping the crowbar OV protection. I have not played with the
setpoint since it was working fine at the beginning (stayed just
under 14v) so it should not have changed. I can't see that water got
into the regulator as it is potted in epoxy or similar. My battery
acts fine, takes a charge in a reasonable amount of time and my volt
meter is correct as I checked it with another and the crowbar goes
off and just the right voltage. What could cause this?
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Only a failure within the PMR1C-14. Suggest you
return it to B&C for a checkup.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Mon Aug 23, 2010 8:51 pm Post subject: B&C alt voltage goes right up to 16V |
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At 09:19 AM 8/23/2010, you wrote:
| Quote: |
There is another possibility, depending on where in the circuit the
voltage regulator measures the voltage. If there is a high
resistance in the field circuit, the regulator might be seeing a
lower voltage than is at the main bus. In that case, the regulator
would tell the alternator to put out more. Make sure that all of
the connections in the electrical system are secure, especially in
the regulator sense and field circuits.
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The PMR1C-14 is a more robust version of the
rectifier/regulators supplied with the majority
of 20A or smaller PM alternators. VERY simple,
and senses voltage right at the output lead of
the regulator.
If this particular regulator is misbehaving, it's
unlikely that the problem lies outside the device.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
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sblack
Joined: 14 Aug 2010
Posts: 21
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| Posted: Sun Sep 19, 2010 5:40 am Post subject: Re: B&C alt voltage goes right up to 16V |
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yep, you were right. Replaced it and no problems.
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_________________
Scott Black
Montreal
Jodel F11 O-200 |
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