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detlili
Joined: 07 Jun 2008
Posts: 2
Location: Punta Gorda
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 Posted: Mon Mar 04, 2013 1:44 am Post subject: Low AC voltage output from the internal genersator |
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Hi!
A friend has problem with the 914 charging system.
Some flight hours ago he mentioned a lower than normal charging voltage and today the red light was burning.
I checked the regulator output on B+ and got only the battery voltage.
I checked the yellow to yellow wires of the generator and got 0,9 OHM. A little bit outside of the range from the manual that says 0,1 - 0.8 Ohm. It is not a calibrated OHM meter!!!
Yellow to Ground infinitive.
The AC voltage output is at idle low. 11 V instead of 18-20 V
At 2000 RPM the Voltage is 15 V
At 4000 RPM 30 V
The regulator ground to ground is OK.
Do you have an idea why the Generator AC output is so low at idle and 2000 RPM
Thanks in advance
Detlef
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_________________
Detlef
A&P, CFI
RV-7 400+ hours on auto gas
www.flight-around-the-world.org |
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Gilles.Thesee(at)ac-greno
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| Posted: Mon Mar 04, 2013 1:58 am Post subject: Low AC voltage output from the internal genersator |
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detlili a écrit :
| Quote: |
Hi!
A friend has problem with the 914 charging system.
Some flight hours ago he mentioned a lower than normal charging voltage and today the red light was burning.
I checked the regulator output on B+ and got only the battery voltage.
|
Detlef,
Could you be more specific about what DC voltage readings you have ?
It is normal to have something below 13 volts at low RPM. "Normal" DC
voltage with not too much current draw is about 13.8 V (at) 5000 RPM with
the Rotax voltage regulator.
Best regards,
--
Gilles
http://contrails.free.fr
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detlili
Joined: 07 Jun 2008
Posts: 2
Location: Punta Gorda
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| Posted: Mon Mar 04, 2013 4:07 pm Post subject: Re: Low AC voltage output from the internal genersator |
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| Quote: |
Could you be more specific about what DC voltage readings you have ?
It is normal to have something below 13 volts at low RPM. "Normal" DC
voltage with not too much current draw is about 13.8 V (at) 5000 RPM with
the Rotax voltage regulator.
Best regards,
--
Gilles
http://contrails.free.fr |
Thanks Gilles for you reply!
Today I replaced the regulator. But the DC output is below 13.5V under full load and with 4000rpm
I also checked again the yellow wires but not from yellow to yellow, instead each yellow wire to ground and got 26 V on both wires.
That means in my opinion that both half waves are OK. But why is my total voltage only half of the voltage from what it should be like the manual told us.
regards
Detlef
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Detlef
A&P, CFI
RV-7 400+ hours on auto gas
www.flight-around-the-world.org |
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