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Posted by on June 23, 2009, 5:44 pm
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On Tue, 23 Jun 2009 13:58:05 -0700 (PDT), Pumbaa
>Hello,
>Forgive the cross post, I was sent here by someone at alt.home.repair.
>
>I have a Coleman Powermate 1850 MegaPulse Generator Model PM0401853
>which I am trying to help my father-in-law fix.
>Unfortunatley I don't have any sort of tachometer to check the speed
>but it starts easy and sounds right and I really don't feel that
>there is anything wrong with the gas motor itself.
>
>
>So, I assume that my problem is in the generator side of things, it
>will only give me about 90 Volts @ 60HZ. Because the Hz is right I
>assume that the RPM's are correct, so why am I only getting 90 Volts?
>
>
>If I manually overspeed the motor (and it really sounds like it is
>running too fast when I do this) I can get 120 Volts BUT the
>frequency is about 70 Hz (which again leads me to beleive that the
>engine speed
>is too fast). This is frustrating because if I had a bad diode or a
>bad winding I would think it would not work at all. But I cannot
>think of a reason that I would get low voltage at (what I assume to
>be) the correct RPM.
>
>
>Some research on the internet let me to un-solder the diodes on the
>rotor and according to my voltmeter they are okay. What I need to
>know is what Ohm readings I should get on the rotor windings as well
>as on the different windings in the stator. Also, according to my
>voltmeter the capacitor is okay.
>The only manual I can find for this generator on the internet is the
>owners manual. Anyone with a techical manual for this generator
>perhaps you can help out...
>
>
>Thanks in advance
>
>
> Craig
>
>
>** Follow UP** the folks at Powermate think it is a diode problem
>(unless I am using my voltmeter wrong, I already checked them).
>
>ALSO, I am using a Craftsman Digital Voltmeter (I have an old analog
>meter if that is better).
>For the Hz I am using a device called a KILL A WATT, don't know how
>much I can trust it, but, it is the only thing I have that shows
>frequency.
The KillAWatt is certainly satisfactory for testing voltage and
frequency.
I would suspect something in the ekectronics of the generator, but
don't have a diagram for reference.
John
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