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nuckolls.bob(at)aeroelect
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 Posted: Fri Jul 05, 2013 5:06 am Post subject: Low voltage indicator with dual alternators |
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At 04:47 PM 7/4/2013, you wrote:
| Quote: |
I'm going to have a 60a primary and a 20a secondary alternator with
B&C LR3C and LS1A voltage regulators respectively.
If in the event of a primary alternator failure, and I switch to the
secondary, will the primary low voltage warning light (off of LR3C,
pin 5) remain illuminated? Or will switching off that alternator
open the low voltage circuit?
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No, the OV and LV sense lines along with power to
run those systems is independent of the regulator
circuits. The LV warning systems will function whether
or not the alternator is powered.
Bob . . .
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donjohnston
Joined: 13 Dec 2009
Posts: 231
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| Posted: Fri Jul 05, 2013 10:33 am Post subject: Re: Low voltage indicator with dual alternators |
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| nuckolls.bob(at)aeroelect wrote: | At 04:47 PM 7/4/2013, you wrote:
| Quote: |
I'm going to have a 60a primary and a 20a secondary alternator with
B&C LR3C and LS1A voltage regulators respectively.
If in the event of a primary alternator failure, and I switch to the
secondary, will the primary low voltage warning light (off of LR3C,
pin 5) remain illuminated? Or will switching off that alternator
open the low voltage circuit?
|
No, the OV and LV sense lines along with power to
run those systems is independent of the regulator
circuits. The LV warning systems will function whether
or not the alternator is powered.
Bob . . . |
Sorry if I'm belaboring the point, I just want to make sure I got this right.
If I switch to the secondary alternator (and switch off the primary alternator), the LV light on the primary's VR will not be illuminated?
-Don
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jul 05, 2013 11:27 am Post subject: Low voltage indicator with dual alternators |
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At 01:33 PM 7/5/2013, you wrote:
| Quote: |
nuckolls.bob(at)aeroelect wrote:
> At 04:47 PM 7/4/2013, you wrote:
>
> >
> >
> > I'm going to have a 60a primary and a 20a secondary alternator with
> > B&C LR3C and LS1A voltage regulators respectively.
> >
> > If in the event of a primary alternator failure, and I switch to the
> > secondary, will the primary low voltage warning light (off of LR3C,
> > pin 5) remain illuminated? Or will switching off that alternator
> > open the low voltage circuit?
> >
> >
>
> No, the OV and LV sense lines along with power to
> run those systems is independent of the regulator
> circuits. The LV warning systems will function whether
> or not the alternator is powered.
>
> Bob . . .
Sorry if I'm belaboring the point, I just want to make sure I got this right.
If I switch to the secondary alternator (and switch off the primary
alternator), the LV light on the primary's VR will not be illuminated?
-Don
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I presume you're talking about Z-12. Any time you have a
low voltage condition, both regulators will flash their
low voltage lights (if installed). Since lv warning
is redundant, you COULD install only one light on either
one of the regulators.
Bob . . .
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Mauledriver(at)nc.rr.com
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| Posted: Fri Jul 05, 2013 1:16 pm Post subject: Low voltage indicator with dual alternators |
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On 7/5/2013 9:05 AM, Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 04:47 PM 7/4/2013, you wrote:
>
>
> I'm going to have a 60a primary and a 20a secondary alternator with
> B&C LR3C and LS1A voltage regulators respectively.
>
> If in the event of a primary alternator failure, and I switch to the
> secondary, will the primary low voltage warning light (off of LR3C,
> pin 5) remain illuminated? Or will switching off that alternator open
> the low voltage circuit?
No, the OV and LV sense lines along with power to
run those systems is independent of the regulator
circuits. The LV warning systems will function whether
or not the alternator is powered.
I have the same setup and that's how it works. That is, the low voltage
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light simply monitors the voltage on the buss independent of alternator
operation. Given that, I've wondered how a failed alternator would
manifest itself.
- If failure was due to an overvoltage situation, the breaker would
pop. Since I normally fly with the 2 busses interconnected, I would
expect the low voltage lights to remain off perhaps for the remainder of
the flight. If one did come on because buss voltage dropped below the
threshold, I would expect both to come on more or less simultaneously as
long as the busses were interconnected. The only explicit indication of
Alt failure would be the popped OV breaker.
- Are there other modes of Alternator failure where there would be no
explicit indication of failure? I'm thinking that a snapped belt would
be an example. If loads and battery condition were such that the
interconnected buss voltage stayed above the low volt threshold, there
would be no explicit indication. Is that right?
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