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s_kilishek(at)yahoo.com
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 Posted: Sun Dec 24, 2006 11:39 am Post subject: Over Voltage |
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I'm using a generic Ford regulator (Wells VR749) and a
B&C OVM-14 overvoltage module wired as per Z-22 in my
RV8.
It worked fine for a short time, but after about 4
hours of flying, the overvoltage indicator light
started flickering. Bus voltage is rising above 15
volts (one time as high as 16 volts), then dropping
back below 15 volts and immediately rising again.
It looks to me like the regulator isn't regulating and
that the OV module is cutting off the field excitation
until voltage drops below 15.
I've replaced the regulator twice, but the problem
continues.
Is there somewhere else I should be looking?
George
N57GK
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clouduster(at)austin.rr.c
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| Posted: Tue Dec 26, 2006 7:32 am Post subject: Over Voltage |
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George,
I have the same regulator (VR 749) controlling a 100 amp Mazda
alternator. I'm running the engine on the ground while I finish the A/C
but I've experienced the same thing. High voltage at the battery.
Measured voltage is approximately 15.5 volts when running. I'm using an
Odyssey PC 680. Before I installed the Odyssey I was using a large 12
volt truck battery to start the engine and test the charging system.
Using the large battery and temporary wiring I did not have any over
voltage problems. As soon as I installed the PC 680 and flight ready
wiring the voltage at the battery went too high.
Dennis H.
Sally Kilishek wrote:
| Quote: |
I'm using a generic Ford regulator (Wells VR749) and a
B&C OVM-14 overvoltage module wired as per Z-22 in my
RV8.
It worked fine for a short time, but after about 4
hours of flying, the overvoltage indicator light
started flickering. Bus voltage is rising above 15
volts (one time as high as 16 volts), then dropping
back below 15 volts and immediately rising again.
It looks to me like the regulator isn't regulating and
that the OV module is cutting off the field excitation
until voltage drops below 15.
I've replaced the regulator twice, but the problem
continues.
Is there somewhere else I should be looking?
George
N57GK
__________________________________________________
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| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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