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Anybody know PTO generators?

M

mkirsch

Well-known Member
I have been banging my head against a wall trying to get a little Winpower 6KW PTO generator to make juice for the last couple of weeks.

My biggest problem is that NOTHING is labeled, and the innards of the generator look NOTHING like the parts diagrams.

The shunt rectifier (I think, again, not labeled) is definitely bad. When I pulled it to check the diodes with a meter, I brushed against it and the diodes turned to DUST.

I replaced the rectifier with a new one from Radio Shack, but I have no idea if it's wired in properly. When the diodes fell apart, my means of figuring out which wire did what went down the toilet.

There's two brown wires, and two white wires going to the rectifier. I can't see where any of the wires go.
 
Thanks Hal.

I have the wiring diagram, but it does me no good.

NONE of the wires are labeled on the generator.

I can't trace the wires because I can't see where they go. They all disappear back in behind the brushes.
 
For those who understand electrical theory. Just looking at
the components is enough. No diagram required.
There are geneic on size fits all regulators on eBay etc .
Just connect the two AC leads which sense output voltage and
supply excitation current. Doesn"t matter which wire on which
terminal.To the main terminals between the main windings and
the primary/main breaker.
The other two leads from the regulator connect to the slip
ring brushes. Polarity isn"t a huge issue as long as you flash
the fields according to the wires on the regulator.
 
Regulator or rectifier?

I could only identify one rectifier, and I've replaced it. I can't see anything that would be a regulator.

Do the windings go to the AC side or the DC side of the rectifier? According to Winpower's wiring schematic, they go to the DC side. I'm assuming the brown wires go to the windings, but I can't tell.

If the rectifier hadn't disintegrated on me before I could see what was hooked where I might've been able to figure it out.
 
Is there a model # on the generator head itself? I've fixed a few PTO gennys but am not an expert. I think there's only half-a-dozen standard formats they use for wiring. Depends on how many brushes, if it has a regulator, and if it makes its own field current or relies on an outside source. Usually the only semi-conductors are a few rectifiers, caps, and maybe a thermistor. I have an old 17KW unit that I had trouble with - and wound up putting a univseral ACR box along with an external field exciter. Probably wasn't the perfect fix - but it works great.

Send me the model # and I might have the proper diagram here. Or send some photos of the internals.
 
The good news is that the generic Block that drops in is a
combo regulator and rectumfire. Not a miss spelling either. We
had problems with those in the stations. They were spec"d so
vastly over size and underloaded. They had voltage control
problems. As they aged the capacitors would dry out and fail.
 
Some have regulators and some do not. The rectifiers are usually (but not always) in four-unit brides. A varistor is often used to protect the rectifiers from voltage spikes.

The field "bridge" set of probably four rectifiers gets AC on the input and makes DC on the output that is sent to the field to "excite" it. If any of the rectifiers fail, you get no DC field current and the unit will not work.

How many brushes or "slip rings" does your unit have?
 
Even if the factory only used a rectifier and no regulator. The rectifier/regulator is much superior. Steady 120V instead of gaining excitation when not needed at light load.
Prevents voltage swings from approx 135V at no load and 105V at full load.
 
It's a Winpower 10/6 PT2. Late 1966 model by the serial number.

It appears to have 3 slip rings and 5 brushes.

The only "electronics" I found was the one rectifier. Everything else is just wires.

I've got all the parts diagrams and wiring off the Winco/Winpower website, but like I've said, it's IMPOSSIBLE to trace the wiring. You just can't see where it goes.
 
I will say this, Pto generators are really nice. We used one ween the power went out for about 8-10 hours and was really nice
 
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