Mep804a 170v on output terminal?

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319cssb

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Easley SC
The generator puts out electricity at 60hz but 170v to the L's and neutral. Can someone give some advice on how to manage the voltage down to 120v?
 

Scoobyshep

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Going to assume you have tried the voltage adjust knob, are you relying on the set gauges or a digital meter?

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319cssb

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Voltage knob does nothing. Im reading voltage from gauge and multimeter 170v output at 60hz . I dont know how much rpm, but I would like to check it
 

Scoobyshep

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Rpm and frequency (Hz) are directly related. If the rpm was wrong then the frequency would be off as well. So there is no reason to check rpm.

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319cssb

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Easley SC
My voltage knob differs from the part number in the tm 9-6115-643-24
There it calls for a RV4NAYSD203A mine is however RV4LAYSD203A. Does that matter? Because the results I get differ from the results I should see as per TM
IMG_9953.JPG
 

319cssb

Member
729
7
18
Location
Easley SC
Rpm and frequency (Hz) are directly related. If the rpm was wrong then the frequency would be off as well. So there is no reason to check rpm.

Sent from my SM-G950U using Tapatalk
That fact makes sense to me as well, I like to just double check it from the RPM i should be seeing
 

Scoobyshep

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Florida
Couldnt tell you. The important things are the power rating and resistance. Odds are you are barking up the wrong tree. Follow the procedure in The TM, there should be something for high voltage or how to test the voltage regulator. I have very little hands on with the 800 series, something simple to look at is is this unit in a parallel mode? It could be looking for an external source for voltage regulation.

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Guyfang

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Here is the listing for the gen set volt regulation system. Normally, Scooby's suggestion in post #9 is the one I would make. Follow the TM.

BUT, the military, in its infinite wisdom, procured TWO different Volt Regulator systems. One made by Libby. One made by TRC. Sooooooooooooooooooooooooo, you need to look at the attached list, and then the V1, (volt regulator). Note the manufacturer, and then look at the rest of the listed numbers on the list. You can not mix and match parts. All have to be from the same company.
 

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Guyfang

Well-known member
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Location
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My voltage knob differs from the part number in the tm 9-6115-643-24
There it calls for a RV4NAYSD203A mine is however RV4LAYSD203A. Does that matter? Because the results I get differ from the results I should see as per TM
View attachment 801979
OK. Did a little research. Both the RV4LAYSD203A and RV4NAYSD203A are 20 ohm variable resisters. Are you testing without removing the wires? If they stay hooked up, then your reading will not be right. If the name on the A1 is not TRC, then they do not match.
 

319cssb

Member
729
7
18
Location
Easley SC
Yes, Guy my A1 is made by TRC and i replaced the mosfets with new ones, but same results.
IMG_9778.JPG
I will check out that voltage reostat again.
 
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