MEP-005A Stamford AVR installed, All original parts removed. I need to change to 3phase AVR. Currently no output.

[Woodmaneng]

Hello All,
I am new to generators, and the learning curve is steep when you are desperately needing a functional unit.
I purchased a MEP-005 from a dear cousin. Former forest service unit. It runs well. It was outputting 120v and 240v right after I brought it to the shop. I was able to read 240 volt leg to leg when initially checked. I was using the generator during a power outage for 120v. Suddenly quit producing after about 20 minutes of use. Now when checking voltage I only read 460 volts from any leg to neutral. Only .8 volts leg to leg. yes point eight volts.

A Newage Stamford SX460 is installed, and all of the original electrical component's have been removed. I cannot use the original wiring diagram for trouble shooting. Can the sx460 work with a 3 phase system? I have poured over the spec sheets of various AVR suppliers / MFG's. I will be doing all the work myself.

My thought is to buy a new AVR and start from scratch. Can anyone point me in the right direction.

I bought it to supply my machine shop with reliable 60 amp 3phase service to only use on my 3 phase equipment. I only use 3 phase occasionally so a generator is a good option vs getting a power company to install 3 phase service. I am very rural...

Thanks in advance, I know this is going to be a mind bender.

 

[87cr250r]

You can use single phase regulators on 3-phase generators. This works fine if you have primarily 3-phase loads but can result in imbalance if you have primarily single phase loads. Confusing, eh?

You can test the generator by connecting a 6 volt lantern battery to the field.

What is your wiring configuration?

https://www.marathongenerators.com/generators/docs/manuals/Connection%20Diagrams.pdf

 

[Woodmaneng]

You can use single phase regulators on 3-phase generators. This works fine if you have primarily 3-phase loads but can result in imbalance if you have primarily single phase loads. Confusing, eh?

You can test the generator by connecting a 6 volt lantern battery to the field.

What is your wiring configuration?

https://www.marathongenerators.com/generators/docs/manuals/Connection%20Diagrams.pdf

I am assuming you are referring to Delta or wye. I am using 120/208, or plan to. Not 240/440.
The shop has 240 single phase already and I also made a 3 phase rotary converter for the light power draw. I have a couple of large cnc mills and lathe. these are what I need the generator for. Never more than 60 amp load unless you count startup.

 

[87cr250r]

Did you look at the diagrams? It's a lot more complicated than delta or wye. You said initially that you were running 240 and 120 which is available with the "parallel low zigzag". This is single phase. 208Y/120 is 3 phase and would be available from the parallel wye configuration.

Check the nameplates of your machines. Not all will tolerate 208 volt.

 

[Woodmaneng]

You can use single phase regulators on 3-phase generators. This works fine if you have primarily 3-phase loads but can result in imbalance if you have primarily single phase loads. Confusing, eh?

You can test the generator by connecting a 6 volt lantern battery to the field.

What is your wiring configuration?

https://www.marathongenerators.com/generators/docs/manuals/Connection%20Diagrams.pdf

I just did click on your link. I want to compare it to the wiring as it is now, Know more tomorrow.