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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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 Posted: Thu Oct 03, 2013 6:06 pm Post subject: ROTAX 912ULS ALT flicker..... Help?! |
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So, went for a flight today. Temps were chilly at 8 degrees Celsius. Fired her up with a voltage showing of 12.8 before turning the key. Fired right up. Then...... I noticed the ALT light showing a flicker, then to about half strength. Did this at all RPMS. It was showing a charge no problem, so I pulled the ALT breaker and reset. When I pulled the breaker, it dropped the charge. Push back in, and light flicker and back on. I decided to fly since it was in fact showing a charge. By the time the airplane was up to temps, it went off and never showed up again. Even in flight, I loaded the electrical system fully, and it didn't come back on. Any ideas?
Here is the schematic from the airplane.....
Thanks!
Chad
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C-GYXQ. 912ULS. 601XL-B |
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nuckolls.bob(at)aeroelect
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| Posted: Thu Oct 03, 2013 6:33 pm Post subject: ROTAX 912ULS ALT flicker..... Help?! |
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At 09:06 PM 10/3/2013, you wrote:
| Quote: |
So, went for a flight today. Temps were chilly at 8 degrees Celsius.
Fired her up with a voltage showing of 12.8 before turning the key.
Fired right up. Then...... I noticed the ALT light showing a
flicker, then to about half strength. Did this at all RPMS. It was
showing a charge no problem, so I pulled the ALT breaker and reset.
When I pulled the breaker, it dropped the charge. Push back in, and
light flicker and back on. I decided to fly since it was in fact
showing a charge. By the time the airplane was up to temps, it went
off and never showed up again. Even in flight, I loaded the
electrical system fully, and it didn't come back on. Any ideas?
Here is the schematic from the airplane.....
Thanks!
|
The Ducatti (Rotax) rectifier/regulator 'warning'
circuit is not a sophisticated source of data.
If your voltmeter reports a normal/steady
bus voltage and the light flickers . . .
I would have more faith in the voltmeter. If
it were my airplane, I would disconnect
the warning output from the regulator and drive
the light with a real, low voltage warning
sensor that accurately deduces bus voltage
and flashes the light when the bus is below
13.0 volts.
Eric Jones offers such a device. We'll have
a new one out in the next few weeks (software
and hardware are in the proof of concept phase).
Bob . . .
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Fri Oct 04, 2013 1:40 am Post subject: Re: ROTAX 912ULS ALT flicker..... Help?! |
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Thanks Bob! How do I go about getting one from Eric Jones?
Chad
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_________________
C-GYXQ. 912ULS. 601XL-B |
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nuckolls.bob(at)aeroelect
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| Posted: Fri Oct 04, 2013 3:33 am Post subject: ROTAX 912ULS ALT flicker..... Help?! |
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At 04:40 AM 10/4/2013, you wrote:
| Quote: |
Thanks Bob! How do I go about getting one from Eric Jones?
Chad
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See http://tinyurl.com/ngumthf
Bob . . .
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Fri Oct 04, 2013 9:50 am Post subject: Re: ROTAX 912ULS ALT flicker..... Help?! |
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Newer alternators probably have electronics that illuminate a red LED to warn of low voltage. But for almost a century the low voltage lamp was a little incandescent lamp. Swapping it with an LED is not stone simple, since the internal regulator might depend on the characteristics of the incandescent lamp.
So here is an LED that "looks like" an incandescent lamp. Attached.
Here is a potentially valuable collection of information regarding connections to automotive alternators. Ducatti is on the list, but many common units seem to be.
http://www.jimcotest.com/docs/JIMCO%20Alternator%20Test%20Lead%20Picture%20Guide.pdf
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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