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Old 04-26-2022, 08:54 AM   #1
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Surge Protector tripping for high voltage

I have a 2022 Red 360. I believe that the generator is outputting too high of a voltage, 132-134v. After about a minute of running the charger and one of the AC's the surge protector trips off. With the cover off the surge protector I can monitor the voltage and frequency. The frequency is 60.2hz and the generator is at 132v under about a 50% load.
The generator is an Onan QD8000. Has anyone had any experience adjusting the output voltage? On shore power everything works as designed, even though my line voltage is 124v.
I have called two Cummins/Onan shops and they only change oil and filters. They do not actually work on their generators. It looks like I might have to wait until I get back by my dealership in June to have this looked at by someone who has the service manuals. It is probably just a pot on a circuit board, but without the books I can't do much.
The over voltage protection is said to trip at 132v. That is where I am, 134v at no load after over voltage trips.
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Old 04-26-2022, 10:55 AM   #2
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The QD8000 is an inverter output generator. I don't think that can be adjusted, but I may be wrong.
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Old 04-26-2022, 11:44 AM   #3
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Unless they changed in recent years, Cummins/ Onan generators are made by Kubota. You might try one of their shops. Or call Cummins and ask where to get service.
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Old 04-26-2022, 01:29 PM   #4
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I called another Cummins Sales and Service in Mesa. Brian is going to talk to his generator man and get back to me. Looks to me like the Freightliner Chassis plant did not test run the generator.
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Old 04-26-2022, 02:41 PM   #5
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I now have a Friday appointment. Fingers crossed
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Old 04-26-2022, 11:00 PM   #6
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Quote:
Originally Posted by RonAz View Post
I called another Cummins Sales and Service in Mesa. Brian is going to talk to his generator man and get back to me. Looks to me like the Freightliner Chassis plant did not test run the generator.
Freightliner didn't install your generator, your body builder did.
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Old 04-26-2022, 11:16 PM   #7
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If you haven't done so already, I'd suggest to give Tiffin tech support a telephone call.

Kimbroughs in Muscle Shires AL may be a resource as well. They work closely with Tiffin factory and are typically very generator knowledgeable.
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Old 04-27-2022, 07:11 AM   #8
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there is a cummins facility in avondale, near intersection of i-10 and 101. they are a big rig repair facility but they do service their generators. i had to have a cylinder head replaced (under warranty). they have a full time person just working on generator and he what he was doing.
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Old 04-27-2022, 07:28 AM   #9
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I have an appointment Friday at Cummins in Mesa. I called Tiffin but the person I needed to talk to was out. I am pretty sure that id I do anything other than oil and filters they might be able to void the warranty.
Probably needs an adjustment or a new circuit board.
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Old 04-27-2022, 08:31 AM   #10
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Old 04-29-2022, 12:03 PM   #11
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UPDATE: Took coach to Cummins in Mesa and they verified my findings. Inverter is out of spec on the unit. Should be 118-120 volts and it is 132-134 volts. This causes surge protector to trip for high voltage. Interestingly, the over voltage for the generator is 138 volts, so the unit does not shut down automatically.
Cummins has no inverters in stock in North America. They are going thru the chain of command for a replacement generator.
Tiffin had me call a local company and the lady said that they have been waiting for inverters from Cummins/Onan for a year and haven't received any.
I called Tiffin and a really nice man is checking to pull one from their very small inventory and ship it to my dealer. Top notch I would say!! As opposed to Onan who appears to be putting all their parts into new production and not supporting the customers that have already bought from them. This Onan 8000 has less than one hour on it!
If Cummins in Mesa can supply a new unit, not remanned, then I will go with them so that Tiffin does not have to take a unit from production. Tiffin is willing to replace, so this should have a happy ending.
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Old 04-29-2022, 12:07 PM   #12
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Thanks for the update, hope all goes well.
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Old 04-29-2022, 01:34 PM   #13
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Unfortunately, Tiffin does not have a Onan 8000 or an ETA. Trying Onan direct now.
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Old 04-29-2022, 03:20 PM   #14
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Not doing well. Onan doesn't have any 300-6058-02 inverters to sell. Looks like due to shortages factory is not releasing parts.
I found one place on line that can repair inverter for $900. Doesn't seem like the way I should have to go for a new unit. I tried several online vendors that say they have one, but when I call they don't.
Sounds like putting a lock on the generator slide out might not be a bad idea. These might go the way of Cat Convertors.
Another example of what happens when everything is supplied offshore.
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