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Old 01-01-2015, 07:37 AM   #15
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This is a more typical ac filter circuit. You might try a good power strip with a filter for computers and entertainment equipment.
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Old 01-01-2015, 07:42 AM   #16
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I understand what you are saying regarding transformers but I would have thought that both would have cleaned up the noise better than what I saw also I wasn't expecting the variation in hz between the two. I just wonder if my voltage regulator is keeping me from increasing the output voltage? I did find a analog clock and the little I played with it, it appears that the generator is running at approximately 70 hz. I will do some more checking today by running the generator and the clock to see if a 1500 watt load will bring down the hz since it does reduce the voltage to 105.
I will try the power strip also.
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Old 01-01-2015, 09:35 AM   #17
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Did some more tests today using a filtered power strip and a Craftsman Professional Digital Multi-meter with hz function.
No load volts 112 at 296 hz,
1500 watt load 107.8 volts at 137hz
Using a analog clock:
No load, watch elapsed time 60 minutes - analog clock 72 minutes
1500 watt load, watch elapsed time 60 minutes - analog clock 72 minutes.
I then realized a had "Kill A Watt Meter that also read hz. These reading did not have any distortion.
No load 69.8 hz
1500 watt load 68.6 hz
My questions now are:
do I slow down the engine to obtain 60 hz? (per the manual that is what you have to do to lower hz).
Will it lower the output voltage since the manual states to increase output voltage you need to increase speed even though it did not on this generator.
Could the voltage regulator be defective being the cause for having a output voltage of only 110/112 vs the normal 120, or are there any suggestions for increasing the voltage.
Thanks for any input.
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Old 01-01-2015, 10:43 AM   #18
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Try playing with the speed to see if you can get close to 60 hz. Then measure the voltage and report back.

Sounds like the Craftsman meter is not working well to measure frequency and the kill A watt is doing ok. Given that, see what voltage etc you get with the Kill A Watt meter and leave the Craftsman on the bench for now.
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Old 01-01-2015, 11:00 AM   #19
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I will try adjusting the speed. Both the Craftsman meter and the Kill a Watt meter read the same voltage.
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Old 01-01-2015, 11:02 AM   #20
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The meters will be sensitive to noise.

Frequency should be a direct function of engine rpms controlled by a governor. Output regulation should be controlled by exciting the armature. This is generally done by brushes from the regulator circuit.

Bad brushes
Bad regulator
Bad windings with vibrations causing intermittent connections or shorts.

An oscilloscope is very handy in tracking this type of problem.

Disclaimer: there's many ways to implement a generator and I'm not familiar with yours. Do you have a model number, year...
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Old 01-01-2015, 11:54 AM   #21
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Here's some info from googling kohler generator brushes that you might find useful.

http://blog.rv.net/2008/05/cleaning-...ushes-part-19/
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Old 01-01-2015, 12:03 PM   #22
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Quote:
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Here's some info from googling kohler generator brushes that you might find useful.

Cleaning Generator Slip Rings and Brushes Part 19
That will have to be my next step, but it will have to wait, right now it is about 20 degrees outside and it is time to wait for warmer weather where I can slide the Generator out away from the motorhome to get better access. Is there a way to check the voltage regulator?
Here are my results from slowing down the speed:
No load 106.1 volt 61 hz
1338 watt load 101.1 volt 60.1 hz
With this low voltage I will be burning out my air conditioner compressors.
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Old 01-01-2015, 12:58 PM   #23
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Put a big load on on it and run it hard for an hour. Heat lamps...

Might clean the slip rings like the article says.

The power conditioners/surge suppressers specify the low and high voltage limits. Check them out to get an idea of what is acceptable. I'm probably going to install a hard wired unit this spring. I'd hate to loose my compressors due to low shore power voltage. I've seen some pretty hoaky run down power distribution at campgrounds.
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Old 01-01-2015, 01:19 PM   #24
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Quote:
Originally Posted by Kota View Post
Put a big load on on it and run it hard for an hour. Heat lamps...

Might clean the slip rings like the article says.

The power conditioners/surge suppressers specify the low and high voltage limits. Check them out to get an idea of what is acceptable. I'm probably going to install a hard wired unit this spring. I'd hate to loose my compressors due to low shore power voltage. I've seen some pretty hoaky run down power distribution at campgrounds.
I have 2000 watts on it right now has been running an hour voltage is 93.
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Old 01-01-2015, 01:30 PM   #25
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I have added another 300 watts or so, voltage now is 91. If this works what should I be seeing a gradual voltage increase? It has now been running 1.5 hours, I was planning to run it another 2.5.
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Old 01-02-2015, 03:01 PM   #26
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If you don't see any increase soon you might want to take a look at the regulator. Attached is what I believe to be the correct service manual for your generator if you don't already have it. Check out the section beginning on page 6-6 concerning the regulator.

kohler-7cm21-rv-service-manual.pdf

Hope this helps,
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Old 01-02-2015, 04:45 PM   #27
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Sounds like a really ugly 120VAC sign wave with spikes all over it.

The meter reading may be off due to the ratty sign wave, your meter reads effective voltage and you may clipping the sign wave or low peak to peak voltage. As others have said rusty, dirty slip ring or bad brushes would be my guess.

Be careful on what is plugged in when running the generator sensitive electronics do not like voltage spikes or bad frequency.

Only an o'scope will really tell you what the sine wave looks like.
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Old 01-02-2015, 05:19 PM   #28
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Thanks for the service manual. Since I will have to do this outside and with Ice forecasted for tonight, rain then snow for next week with low in the teens taking the generator apart is going to have to wait. What I want to do is clean the slip ring and see what it will do. Everyone on the Kohler forum advised that should be my next step prior to doing anything else. Now that I have the engine speed set correctly for 60 hz under load I am finally seeing some progress.
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