richard(at)talbots.net.au
Guest
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 Posted: Fri May 08, 2009 5:37 am Post subject: Voltage Runaway on Plane Power Alternator |
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G'day Everyone,
I have a strange fault that has developed on my RV7, with Plane Power Internally regulated alternator. I bought is as it has crowbar voltage protection built in. The aircraft has 20 hours on it and up till recently the alternator worked fine.
The last two flights I have received Over Voltage alerts on takeoff from my EFIS and the 5A breaker has popped - so I guess the crowbar works as advertised and my avionics is all OK. Resetting the breaker works fine once at pattern altitude and the prop is back to 2500 RPM or so. The unit then performs flawlessly for the rest of the flight. I have not tried applying takeoff power at altitude, so I cannot be certain it is the high RPM causing it.
I called the guys at Plane Power and they suggested checking the field line and breaker which I will do tomorrow. However, this is a pretty strange failure mode and I was wondering if anyone else on the list had any ideas. I don't really want to risk cooking my radios etc. There really is not much that can go wrong with the unit's wiring as it only has two wires connected to it.
Thanks/Regards
Richard
Sydney, Australia
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