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If a voltage regulator fails, how high can the voltage
go?
Way higher than 28 volts -- fellow here at the airport
bought an RV-6, and on the way home the VR failed, voltage rose to where it was
frying all the guages and power supplies to GPS and Xponder. He put in the
Aeroelectric (B&C) OV protection circuit after that, and on restart the
Circuit breaker popped, traced it down to a bad ground in the circuit to the VR.
Plane had flown significant hours before this
happened.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
Sent: Wednesday, October 06, 2004 6:57
PM
Subject: [FlyRotary] Re: #$!%@$ temperatures still high
Al, you are right about now having the lack of
over-voltage protection. All I have in line is a fusable link rignt
now. Fortunately, all of my expensive avionics can tolerate voltages of
at least 28V without being affected.
If a voltage regulator fails, how high can the
voltage go?
Dave Leonard
Dave;
That’s interesting. Makes me
wonder whether I should put a scope on voltage and see if it is
smooth.
The downside of connecting the field
to the output, as I’m sure you know, is that you now have the risk of a
runaway voltage condition if the VR fails. I guess the odds are low,
but the costs could be high. Avionics?
I assume that you have a breaker (or
fuse) in the alt field circuit. You can put a “crowbar” circuit
between the field lead and ground that will trip the breaker in an
over-voltage condition. I got one from Aeroelectric.
Al
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