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revenson(at)comcast.net
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 Posted: Fri May 01, 2015 11:41 am Post subject: Do I Have a Problem? |
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Today in flight I turned on the ebus switch (Z11 wiring with master switch on).
I saw a voltage increase of 0.1 volt at the most (from 13.0v). Back on the ground, turning on the same switch showed an increase from 11.8-11.9v to 12.7-12.8 volts.
Is the difference strange? Shouldn't I see about the same increase in flight? And if so, does that mean my 4 diode ebus rectifier is not working right?
Roger E, Tucson.
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Fri May 01, 2015 2:05 pm Post subject: Re: Do I Have a Problem? |
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Assuming that the voltmeter is connected to the ebus, then I would expect somewhere between 0.5 to 1 volt increase when the ebus switch is turned on. Of even greater concern is the low electrical system voltage. It should be closer to 14 volts with the alternator running. And with the engine off, a fully charged battery should have a voltage near 13, but at least 12.5.
Check the voltage with another meter.
Joe
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Fri May 01, 2015 2:19 pm Post subject: Do I Have a Problem? |
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At 17:05 2015-05-01, you wrote:
Assuming that the voltmeter is connected to the ebus, then I would
expect somewhere between 0.5 to 1 volt increase when the ebus switch
is turned on. Of even greater concern is the low electrical system
voltage. It should be closer to 14 volts with the alternator
running. And with the engine off, a fully charged battery should
have a voltage near 13, but at least 12.5.
Check the voltage with another meter.
You took the words out of my mouth . . .
Bob . . .
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revenson(at)comcast.net
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| Posted: Fri May 01, 2015 3:15 pm Post subject: Do I Have a Problem? |
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Sounds like I need to do some serious readings, at many points with both engine off, and with add'l wires run into cockpit to measure while in flight.
With engine off, at the battery I got 13.15 with master sw off, and about 12.94 with master sw on.
With engine off, at the ebus I got 11.8-11.9v with master sw on, ebus sw off. Then, switching on the ebus sw, I get 12.7-12.8v with master sw on, ebus sw on.
It still baffles me why I haven't been seeing an increase in flight when turning on the ebus sw.???? Today it stayed at about 13.0-13.1v. either case (measured at the ebus).
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Fri May 01, 2015 6:30 pm Post subject: Re: Do I Have a Problem? |
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Your latest numbers are in the ballpark except for the ebus voltage in flight with the ebus switch turned on. Check the ebus circuit for bad connections and check the ebus switch for high internal resistance.
Joe
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