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lgold(at)quantum-associat
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 Posted: Thu May 28, 2009 2:11 pm Post subject: Trouble shooting the Rotax Rectifier/Regulator |
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Rick,
I am also checking out a 912 voltage problem similar to yours except my voltage stays under 13V regardless of how long I run the engine or at what RPM. You can see the thread of conversation on this subject by looking back about a week in Aeroelectric-list.
The problem can be a with the coils in the engine, the wiring (unlikely) or with the voltage regulator (which is known to be of marginal quality). Here is what I checked before coming to the conclusion that the voltage regulator was bad.
<![if !supportLists]>· <![endif]>Check the coils for shorts by reading the ohms between the two wires coming from the engine (going to the “G” terminals on the voltage regulator) with the engine off. The resistance should be about .7-ohms (probably .5 to 1-ohm is OK). Also check that neither of these wires are grounded.
<![if !supportLists]>· <![endif]>Check the AC voltage going from the engine to the “G” terminals while the engine is running. Mine was as follows, which the guys at Lockwood told me was just about right:
Idle (1900-RPM) was 12.8 volts
2500-RPM was 16.0 v
3000-RPM was 19.0 v
4000-RPM was 24.5 v
cruse(5000-RPM)was not measured because the plane would have started rolling.
<![if !supportLists]>· <![endif]>If the two items above check out, and your wiring is solid, it’s a good bet the voltage regulator is bad. Lockwood sells a replacement for about $170 but Bob Nuckolls suggests looking for a better quality alternative to Rotax.
Rgds,
Les
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Thu May 28, 2009 3:44 pm Post subject: Trouble shooting the Rotax Rectifier/Regulator |
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If your voltage is consistently 13V regardless of engine rpm the first thing I would do is check the voltmeter in your panel is accurate.
Just a thought
Noel
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Les Goldner
Sent: 28 May 2009 07:41 PM
To: rotaxengines-list(at)matronics.com
Subject: RE: Trouble shooting the Rotax Rectifier/Regulator
Rick,
I am also checking out a 912 voltage problem similar to yours except my voltage stays under 13V regardless of how long I run the engine or at what RPM. You can see the thread of conversation on this subject by looking back about a week in Aeroelectric-list.
The problem can be a with the coils in the engine, the wiring (unlikely) or with the voltage regulator (which is known to be of marginal quality). Here is what I checked before coming to the conclusion that the voltage regulator was bad.
<![if !supportLists]>· <![endif]>Check the coils for shorts by reading the ohms between the two wires coming from the engine (going to the “G” terminals on the voltage regulator) with the engine off. The resistance should be about .7-ohms (probably .5 to 1-ohm is OK). Also check that neither of these wires are grounded.
<![if !supportLists]>· <![endif]>Check the AC voltage going from the engine to the “G” terminals while the engine is running. Mine was as follows, which the guys at Lockwood told me was just about right:
Idle (1900-RPM) was 12.8 volts
2500-RPM was 16.0 v
3000-RPM was 19.0 v
4000-RPM was 24.5 v
cruse(5000-RPM)was not measured because the plane would have started rolling.
<![if !supportLists]>· <![endif]>If the two items above check out, and your wiring is solid, it’s a good bet the voltage regulator is bad. Lockwood sells a replacement for about $170 but Bob Nuckolls suggests looking for a better quality alternative to Rotax.
Rgds,
Les
--
| | - 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:
http://www.matronics.com/Navigator?RotaxEngines-List |
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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