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Onan Standby Generator 50 5KW3 phase 19820


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  #21  
Old 06-17-2017, 11:38:12 PM
Wayne 440 Wayne 440 is offline
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Default Re: Onanstandby generator 50 5KW3 phase 19820

+1 for the comment from pegasuspinto.

And a bit of advice from one of my favorite movies- "...Man's got to know his limitations". A laboring engine and exciter overcurrent are signs that you could easily cause damage that results in a high dollar repair.

Consider spending some money to have an experienced generator tech look it over. That will be much less expensive than a stator rewind.
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  #22  
Old 06-18-2017, 12:45:42 AM
Steve Dawkins Steve Dawkins is offline
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Default Re: Onanstandby generator 50 5KW3 phase 19820

At this point, some good photos of the wiring might help in troubleshooting.

We know you've checked your wiring several times, but make sure that generator leads T6 and T9 haven't gotten crossed. That is an easy mistake.

It sound like something is shorting out, since the voltmeter pegs and the exciter (field) circuit breaker trips. The following procedure will be time consuming, but might help in isolating the problem.

1. Make sure the generator cannot start. Disconnect the battery.
2. Disconnect all generator leads T1 thru T12, and isolate each wire from the others.
3. Take an ohm meter, and connect one lead to a good ground on the generator. Using the other lead, touch leads T1 thru T12 one at a time. You should not have any continuity at all. If you have continuity on any of the tests, you have a winding that is shorted to ground. (Wiring may have to be disconnected from the voltage regulator for this test to be accurate.)


Next, you will check the six windings to make sure that the wires are labeled correctly. Each winding will have two ends. They are as follows:

T1 & T4
T2 & T5
T3 & T6
T7 & T10
T8 & T11
T9 & T12

1. Take your ohm meter and check to make sure you have continuity for each winding.
2. As you check each winding, leave one meter lead attached to a T lead, and touch all the other T leads to make sure there is no continuity between windings.


If the above procedure checks out, perform the following:

1. Tape off T1 thru T12 separately with electrical tape. This will be temporary. Do yourself a favor, and leave a little tail of tape folded back on itself as you wrap each lead. This tail will make it easier to remove the tape after the test.
2. Start the generator and turn on the exciter (field) circuit breaker. See if it trips. Report back to us afterwards, so we will know which way to direct you.
3. USE EXTREME CAUTION WHEN PERFORMING #2 ABOVE, and make sure those leads are insulated well.

EDIT: If you aren't comfortable with performing the above tests, follow the advice suggested by Wayne 400.

Last edited by Steve Dawkins; 06-18-2017 at 01:09:57 AM. Reason: Agreeing with Wayne 440
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  #23  
Old 06-18-2017, 12:45:05 PM
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

I'll put the wire configuration back the way it was and grounded the unit it's putting out power with no problems was the reason that one putting out power the way I had it because it wasn't grounded
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Old 06-18-2017, 12:59:44 PM
pegasuspinto pegasuspinto is offline
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

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Originally Posted by Friends with benefits View Post
I'll put the wire configuration back the way it was and grounded the unit it's putting out power with no problems was the reason that one putting out power the way I had it because it wasn't grounded
I'll be the one to say it. Grounding the unit won't make any difference to if it makes power. (Tho the frame should be grounded). IMHO you're very likely to damage something or get you or someone else hurt. I'm not trying to be mean, I just don't feel like you have a great grasp of electricity and/or generators. Please be careful and consider what you are doing...
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  #25  
Old 06-18-2017, 01:38:46 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

I have been at this for over forty years. Grounding will not effect power out put. If you rewired it and it didn't work. Then returned it to the way it was and now works. You have a wiring problem.
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Old 06-18-2017, 02:32:27 PM
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

If six and nine are crossed how is it making power on three phase
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Old 06-18-2017, 03:04:56 PM
Steve Dawkins Steve Dawkins is offline
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

Just making suggestions for things to check, since you had modified the wiring connections.
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  #28  
Old 06-18-2017, 03:48:00 PM
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

The six and nine connection was very easy to mix up. I liked Cat's way of marking when I worked for them. T6 and T9. Some companies just put 6/9 on the wire. So it depended on how you looked at it
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  #29  
Old 06-18-2017, 04:36:40 PM
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

Thanks for the help but my T6 and T9 are labeled I took all the wires apart and checked all of them for their ground I have no ground that I can find so far

I'm fixing to type all of them off and crank it up and see what happens when I excite it

Tape all of them up individually and crank it up and excite itto see what happens

When I get to the bottom of the problem what should my voltage knob be set on l1 l2or which setting
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  #30  
Old 06-18-2017, 07:29:34 PM
pegasuspinto pegasuspinto is offline
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Default Re: Onan Standby Generator 50 5KW3 phase 19820

I don't think it will make ANY voltage with all the windings disconnected but if it does it could go wide open which can be dangerous as hell.

The voltage select knob is just for the meters and they won't work either if the windings are disconnected

There is no reason to run it with the windings disconnected anyways
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