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jgh2(at)charter.net
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 Posted: Wed Jul 11, 2012 3:38 am Post subject: Over-voltage Circuit Trips |
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Bob N. et al,
Since my RV first flew about a year ago the over-voltage circuit has frequently tripped shortly after take off. Resetting the 5 amp pull-able circuit breaker once or twice generally prevents a re-occurence for the remainder of the flight but I need to determine the root cause and correct it.
The plane is wired in general conformance with the Z-11 architecture using Van's 30 amp externally regulated alternator, their potted Transpo regulator, Bob's potted over-voltage detection device and a PC-680 battery. Prior to start the main bus voltage is usually around 12.5-12.8 volts measured with a meter plugged into a convenience outlet. After start, the voltage reported by the Grand Rapids EIS (on the endurance bus) is around 13.2-13.6 volts. I've never been able to detect a high voltage reading either on the plug-in meter or on the EIS before the over-voltage breaker trips. The breaker was purchased from a used parts supplier at Oshkosh and is a "prime suspect" but trouble shooting suggestions would be appreciated.
Jack H.
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nuckolls.bob(at)aeroelect
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| Posted: Thu Jul 12, 2012 1:42 pm Post subject: Over-voltage Circuit Trips |
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At 06:37 AM 7/11/2012, you wrote:
| Quote: |
Bob N. et al,
Since my RV first flew about a year ago the over-voltage circuit has
frequently tripped shortly after take off. Resetting the 5 amp
pull-able circuit breaker once or twice generally prevents a
re-occurence for the remainder of the flight but I need to determine
the root cause and correct it.
|
Jack, I'm not ignoring you. Will have a response
and some suggestions in the morning . . .
Bob . . .
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jgh2(at)charter.net
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| Posted: Fri Jul 13, 2012 11:16 am Post subject: Over-voltage Circuit Trips |
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On Jul 12, 2012, at 5:40 PM, Robert L. Nuckolls, III wrote:
| Quote: | | Quote: | Since my RV first flew about a year ago the over-voltage circuit has frequently tripped shortly after take off. Resetting the 5 amp pull-able circuit breaker once or twice generally prevents a re-occurence for the remainder of the flight but I need to determine the root cause and correct it.
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Jack, I'm not ignoring you. Will have a response
and some suggestions in the morning . . .
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Thanks Bob. A short flight this morning demonstrated that replacing the suspect circuit breaker did not correct the situation. The main bus was at 12.6 volts prior to start and read a solid 14.2 volts during the flight. The EIS (on the endurance bus) was displaying around 13.6 volts but the breaker tripped twice during each of two climbs to the pattern. All connections and terminals in the field circuit appear to be secure. The aircraft instrumentation does not include a recording capability. Suggestions will be greatly appreciated!
Jack
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jul 13, 2012 11:51 am Post subject: Over-voltage Circuit Trips |
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| Quote: | Thanks Bob. A short flight this morning demonstrated that replacing
the suspect circuit breaker did not correct the situation. The main
bus was at 12.6 volts prior to start and read a solid 14.2 volts
during the flight. The EIS (on the endurance bus) was displaying
around 13.6 volts but the breaker tripped twice during each of two
climbs to the pattern. All connections and terminals in the field
circuit appear to be secure. The aircraft instrumentation does not
include a recording capability. Suggestions will be greatly appreciated!
Jack
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What kind of OV crowbar system is installed on your
airplane? If it's a crowbar module from me,
you can raise the trip voltage setpoint
by turning the adjusting potentiometer 1
revolution counter-clockwise. If you have
a B&C crowbar module, their pot is under the
heat shrink which needs to be cut away and
replaced after the device is re-calibrated.
If it's inside a B&C alternator controller,
you'll need to return it to B&C for re-calibration.
Bob . . .
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wstucklen1(at)cox.net
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| Posted: Sat Jul 14, 2012 3:29 am Post subject: Over-voltage Circuit Trips |
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Jack,
Check for a loose connection in the field circuit, especially in the alternator connector (if you have one). Any
Interruption in the field circuit current (after the regulator) will cause an overvoltage condition when the
connection is reestablished. This is especially true for a slow responding regulator….. Engine heat will
sometimes cause the alternator connector contacts to become loose.
Also check for an intermittent regulator ground ….
If the regulator is internal to the alternator, check for an intermittent engine ground back to the battery…
Fred Stucklen
RV-7A N924RV 750 Hrs (Flying
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
Time:
12:16:39 PM PST US
From:
Jack Haviland <jgh2(at)charter.net (jgh2(at)charter.net)>
Subject:
Re: Over-voltage Circuit Trips | Quote: | | On Jul 12, 2012, at 5:40 PM, Robert L. Nuckolls, III wrote: >> Since my RV first flew about a year ago the over-voltage circuit has frequently tripped shortly after take off. Resetting the 5 amp pull-able circuit breaker once or twice generally prevents a re-occurence for the remainder of the flight but I need to determine the root cause and |
012345678901234
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sat Jul 14, 2012 6:56 am Post subject: Over-voltage Circuit Trips |
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P.S. forgot to mention that each revolution of the calibration
pot on my modules moves the setpoint about 0.5 volts. So if
you're getting nuisance trips with a bus voltage that is running
in normal ranges, you can try one half turn of counter-clockwise
adjustment and see if the trips stop.
Bob . . .
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