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nuckolls.bob(at)aeroelect
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 Posted: Tue Sep 16, 2014 4:11 pm Post subject: alternator knocked off line when strobes turned on |
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At 15:08 2014-09-16, you wrote:
| Quote: |
Good day,
When my strobes are turned on, after two or three seconds the
alternator goes off line. I can turn the strobe switch off, recycle
the master switch and the alternator comes back on line. With the
strobes off, I can load the electrical system clear up to fifty amps
with the landing light, nav. lights, pitot heat, etc. and the
alternator won't go off line. When the alternator goes off line
with the strobes on, the strobes continue to operate off the
battery. This behavior just started.
The aircraft is an older Super Cub. The only instrumentation in the
electrical system is an ammeter on the alternator output. I cannot
find a breaker in the field circuit. The alternator is an InterAv
(Motorola) and the voltage regulator appears to be a Motorola. The
strobes are Whelan.
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Is this a new condition? Try loading the system with
lights and heat and turning all off simultaneously
to see if the trip repeats.
What form and function of OV protection is included
in your system? Sounds like the ov trip has become
'twitchy' . . . do you have an accurate voltmeter
in the system? What is the normal bus voltage.
Bob . . .
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sttwig
Joined: 26 Aug 2007
Posts: 31
Location: Yakima, WA
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| Posted: Tue Sep 16, 2014 7:56 pm Post subject: alternator knocked off line when strobes turned on |
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Thank you for your response.
This is a new condition. The OV protection relay is part of the InterAv system, part no. 635-62448. There is no voltmeter in the system so I don't know what the normal buss voltage is. The only instrumentation in the system is the ammeter on the alternator output. I will load up the system and turn it all off at once after I reinstall the alternator. I removed it for testing at a local shop.
Sent from my iPad
| Quote: | On Sep 16, 2014, at 5:09 PM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
At 15:08 2014-09-16, you wrote:
>
>
> Good day,
>
> When my strobes are turned on, after two or three seconds the alternator goes off line. I can turn the strobe switch off, recycle the master switch and the alternator comes back on line. With the strobes off, I can load the electrical system clear up to fifty amps with the landing light, nav. lights, pitot heat, etc. and the alternator won't go off line. When the alternator goes off line with the strobes on, the strobes continue to operate off the battery. This behavior just started.
>
> The aircraft is an older Super Cub. The only instrumentation in the electrical system is an ammeter on the alternator output. I cannot find a breaker in the field circuit. The alternator is an InterAv (Motorola) and the voltage regulator appears to be a Motorola. The strobes are Whelan.
Is this a new condition? Try loading the system with
lights and heat and turning all off simultaneously
to see if the trip repeats.
What form and function of OV protection is included
in your system? Sounds like the ov trip has become
'twitchy' . . . do you have an accurate voltmeter
in the system? What is the normal bus voltage.
Bob . . .
|
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sun Sep 28, 2014 8:49 am Post subject: alternator knocked off line when strobes turned on |
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Steve,
I ran your ov relay carcass over the bench. While
labeled to trip at 16.0 volts, this one wouldn't trip
at 30 volts. Just why it WAS tripping under stimulus
from your strobes remains a mystery . . . but this
critter was toast.
Bob . . .
--------------------------------
At 22:25 2014-09-21, you wrote:
| Quote: | I will send it to the address on your website.
Steve
Sent from my iPad
> On Sep 21, 2014, at 2:23 PM, "Robert L. Nuckolls, III"
<nuckolls.bob(at)aeroelectric.com> wrote:
>
> At 13:11 2014-09-21, you wrote:
>> Here is a link to the schematic for the InterAv
alternator/regulator/OV relay combo.
http://www.shortwingpipers.org/forum/attachment.php?attachmentid=4575&d=1355847096
>>
>> I changed out the OV relay yesterday and everything returned to
the normal behavior experience before the failure. We will see how
long that lasts.
>>
>> Thanks again for all your help.
>
> Do you still have the old relay? I'd like to have
> it if you have no other plans for it.
|
Bob . . .
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