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ohioip(at)yahoo.com
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 Posted: Sat Sep 20, 2008 7:38 pm Post subject: Jabiru Alternator/Regulator OVM Problem |
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I am running a Jabiru 2200 with about 60 hours. I have the B&C "crowbar" overvoltage module ("OVM") installed and it has been fine until today.
Today I flew for about half an hour. When I throttled back to about 2400 RPM for descent the 5A circuit breaker began tripping. No problems were noted at cruise RPM and idle/taxi RPM.
There were no changes in the load on the electrical system--it's a basic VFR setup with only a COM radio and engine gauges on the DC bus.
The analog panel voltmeter is reading about 14 VDC with the breaker in, but of course that would not provide any indication of transients that might be tripping the OVM.
I'm suspecting the regulator--I previously posted here about problems with an unstable VDO tach reading with the tach input connected to an alternator lead. Perhaps the problems are related.
Before I start digging into the electrical system, has anyone else seen a similar problem or have any suggestions?
Thanks!
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bobf(at)feldtman.com
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| Posted: Sun Sep 21, 2008 4:10 am Post subject: Jabiru Alternator/Regulator OVM Problem |
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I found the small 3A fuse in the voltage sample line to be loose, intermittently allowing for a break in the circuit, this too "low" a voltage, thus the VR would allow the voltage to rise intermittently which would of course pop the OV circuit breaker. The cheap 3 A fust holder was removed, and I put another 3 A in line fuse holder in place which stays snug. problem fixed
bobf
On Sat, Sep 20, 2008 at 10:35 PM, Michael Forhan <ohioip(at)yahoo.com (ohioip(at)yahoo.com)> wrote:
[quote] --> AeroElectric-List message posted by: Michael Forhan <ohioip(at)yahoo.com (ohioip(at)yahoo.com)>
I am running a Jabiru 2200 with about 60 hours. I have the B&C "crowbar" overvoltage module ("OVM") installed and it has been fine until today.
Today I flew for about half an hour. When I throttled back to about 2400 RPM for descent the 5A circuit breaker began tripping. No problems were noted at cruise RPM and idle/taxi RPM.
There were no changes in the load on the electrical system--it's a basic VFR setup with only a COM radio and engine gauges on the DC bus.
The analog panel voltmeter is reading about 14 VDC with the breaker in, but of course that would not provide any indication of transients that might be tripping the OVM.
I'm suspecting the regulator--I previously posted here about problems with an unstable VDO tach reading with the tach input connected to an alternator lead. Perhaps the problems are related.
Before I start digging into the electrical system, has anyone else seen a similar problem or have any suggestions?
Thanks!
[b]
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