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cjaviator(at)gmail.com
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 Posted: Mon Jul 07, 2014 5:35 pm Post subject: CJ-6 Generator Query |
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Hi all.
I have a CJ here that when running the generator warning light will not come on when the RPM is reduced. Normally comes on at (at) 1000 RPM.
Occasionally cycling it will get it operating normally but more often than not it will not go off line.
Light comes on when engine is shut down.
Any tips or advice here? Is it a matter of giving the regulator a birthday or similar?
Regards, Jay
New Zealand
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KingCJ6(at)aol.com
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| Posted: Mon Jul 07, 2014 7:24 pm Post subject: CJ-6 Generator Query |
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Not sure if it's applicable to CJ’s, but in older cars with voltage regulators, lightly filing the contact points would stop the sticking.
Dave
In a message dated 7/7/2014 6:35:28 P.M. Pacific Daylight Time, cjaviator(at)gmail.com writes:
| Quote: | Hi all.
I have a CJ here that when running the generator warning light will not come on when the RPM is reduced. Normally comes on at (at) 1000 RPM.
Occasionally cycling it will get it operating normally but more often than not it will not go off line.
Light comes on when engine is shut down.
Any tips or advice here? Is it a matter of giving the regulator a birthday or similar?
Regards, Jay
New Zealand
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[quote][b]
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Mon Jul 07, 2014 8:22 pm Post subject: CJ-6 Generator Query |
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Sounds more like a bypass relay than generator not dropping off line at preset RPM. Don't know much about the CJ electrical system. The YAK has a lovely device that 99% of the time is bullet proof that bypasses the generator flipping the system over to the BAT SYS when the RPM drops below 40%. When it went TU, it took the help of Mark And Dennis to sort out.
Good Luck Mate!
Doc
Sent from my iPad
On Jul 7, 2014, at 8:34 PM, Jay McIntyre <cjaviator(at)gmail.com (cjaviator(at)gmail.com)> wrote:
| Quote: | Hi all.
I have a CJ here that when running the generator warning light will not come on when the RPM is reduced. Normally comes on at (at) 1000 RPM.
Occasionally cycling it will get it operating normally but more often than not it will not go off line.
Light comes on when engine is shut down.
Any tips or advice here? Is it a matter of giving the regulator a birthday or similar?
Regards, Jay
New Zealand
| Quote: |
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mark.bitterlich(at)navy.m
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| Posted: Tue Jul 08, 2014 7:10 am Post subject: CJ-6 Generator Query |
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Does the CJ6A use the same type of reverse current relay as the Yak's and Sukhoi's? I am not sure.
However, it has a generator, so there should be some kind of reverse current relay in there. How the light is activated by this relay I am not sure. I know the Yak electrical system VERY well, but not the CJ6A.
Who is the electrical guru on the CJ anyway?
Sorry I cannot agree with Dave about filing relay contacts. Yes, it was done a lot on old cars. This was at best a temporary fix. As regards relay points, "back in the day" you could purchase a relay contact burnishing tool kit, which had very precise cut jewelers files, followed by a strip of metal that was used to try and restore the contact points (as Dave was talking about). This method was given up a LONG time ago what with some of the special alloys used on contact points. Typically back in the day, these points "stuck" because they arced enough to actually weld the contacts together. The filing "fix" was done in order to eliminate all the contact burning and arcing which would stop the "welding" for a certain time period, but it would always happen again, because the filing was never even close to "perfect".
Given that this is an airplane and not a car, filing relay points would not be on my list of things to do, other than maybe to get me home to where I could immediately replace it.
This does not help with the original question though, as to why the light is not going on at low RPM. This bothers me quite a bit because there are two possible causes:
1. The light is simply not working right, and no big concern is necessary.
2. The reverse current relay is not working right, in which case there is a serious cause for concern. Once the generator slows down to where it puts out less voltage than the battery, current then flows BACKWARDS from the battery into the generator. In truth the generator is now acting like a motor. The amount of current flow is limited only by the difference in voltage between the slow turning generator and the battery, and lastly THE SIZE OF THE WIRE, which will heat up and eventually burn, unless a fuse blows first.
The "Reverse Current Relay" does exactly what its name implies. If current is flowing in reverse, from the battery to the generator, it OPENS thus breaking the circuit between the battery and the generator, thus stopping really BAD things from happening. In the Yak, this reverse current relay is located in the DMR-200 "Combined Device" located in the main electrical compartment. How it works in the CJ is again outside my field of expertise.
However, when you find it, replace it... if in fact that is what is bad.
Mark
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mark.bitterlich(at)navy.m
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| Posted: Tue Jul 08, 2014 7:52 am Post subject: CJ-6 Generator Query |
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It just dawned on me what this problem could easily be.
You might have extremely weak batteries in your aircraft. Put a digital meter directly on your battery terminals. Read the voltage and then turn on something that draws some current. A landing light would be nice, but failing that Pitot Heat would be OK, but not for very long!
Check and see that your battery voltage does not drop below 22 volts or so. If it goes down to in the "teen" range, like 19 or below... replace the batteries and it will fix your issue.
The reverse current relay in your aircraft (where-ever it is, solid state or otherwise) works by allowing a certain amount of reverse current. If not enough reverse current flows, the relay will never open, until the engine is totally shut off. This can easily happen if your batteries are just worn slam out. And that happens ALL the time with these aircraft, as they are not used for starting, and folks do not realize how important it is to check them properly, and as such they slowly degrade to where something like this happens.
There is a pretty high possibility this is your problem. I hope so anyway, as it is an easy fix.
Mark
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