whizkidkyus
Member
- Location
- South Central , Ky.
Hi,
What can make a generator put out different voltages ? I have one that doesn't work as in generate electric, but motor runs like a top . Took generator power head end cap off today and looked at wires and did a few tests . Brushes are free , where they ride on rotor is clean looking , Field coil or rotor wires don't look burnt . Nothing looks or smells burnt . Took panel where plugs are off and tested there for a bad breaker , didn't find one and probed a 120 plug and was getting anywhere from 2.0 volts ac up to 30 some volts ac and then it would go upwards to 50 vac . Occasionally, it would go up to 90 vac and then up to up to 115 vac . When it hit 115 vac it might hold it for a few seconds or up to a minute possibly before it would let it go and drop back down to 2.0 vac and start flucating again. How long it held 115 vac varied . One time when it read 115 vac I plugged in a 110 vac drill and it ran fine for a few seconds and then stopped . I laid the drill down with the trigger locked on and occasionally it would jerk a little like it was trying to start running again . Motor is a Briggs engine and it has preset rpms from factory . there's no throttle lever. Motor runs like a top and never misses a lick . There's no weird noises coming from genset either. It has 4-110 vac outputs and a 220 vac output . I was getting 110 vac occassionally on two wires on the 220 plug . I didn't have the generators earth ground lug hooked up to an earth ground either, but shouldn't have made a difference . Nothing felt hot or smelled like it was heating up . The AVR was plastic on top and sides ,but the back was full of the black epoxy that they put on there to protect circuit board . There was a capacitor sticking out of it and a transistor . Capacitor looked good and wasn't bulging . Transistor looked good also and there was a bolt threw it with a nut on it to hold a heat sink on it . Where bolt went threw trans. there was a little rust on bolt . Any ideas on this as neighbor wants it fixed . It's a 2007 model Coleman Powermate 120/220 vac 5000 / 6250 watt generator. Model PMO545002. A lot of parts have been discontinued from manufactuer so an idea of where to get parts would be nice too . I, along with an electrical genius friend, as well as an auto mechanic friend ,think that it could be the AVR. But , I guess that it could also be the rotor , field coil, or possibly the brushes or a combo of any of them . Thanks for any and all help !
Whizkid
P.S. Sorry so long
What can make a generator put out different voltages ? I have one that doesn't work as in generate electric, but motor runs like a top . Took generator power head end cap off today and looked at wires and did a few tests . Brushes are free , where they ride on rotor is clean looking , Field coil or rotor wires don't look burnt . Nothing looks or smells burnt . Took panel where plugs are off and tested there for a bad breaker , didn't find one and probed a 120 plug and was getting anywhere from 2.0 volts ac up to 30 some volts ac and then it would go upwards to 50 vac . Occasionally, it would go up to 90 vac and then up to up to 115 vac . When it hit 115 vac it might hold it for a few seconds or up to a minute possibly before it would let it go and drop back down to 2.0 vac and start flucating again. How long it held 115 vac varied . One time when it read 115 vac I plugged in a 110 vac drill and it ran fine for a few seconds and then stopped . I laid the drill down with the trigger locked on and occasionally it would jerk a little like it was trying to start running again . Motor is a Briggs engine and it has preset rpms from factory . there's no throttle lever. Motor runs like a top and never misses a lick . There's no weird noises coming from genset either. It has 4-110 vac outputs and a 220 vac output . I was getting 110 vac occassionally on two wires on the 220 plug . I didn't have the generators earth ground lug hooked up to an earth ground either, but shouldn't have made a difference . Nothing felt hot or smelled like it was heating up . The AVR was plastic on top and sides ,but the back was full of the black epoxy that they put on there to protect circuit board . There was a capacitor sticking out of it and a transistor . Capacitor looked good and wasn't bulging . Transistor looked good also and there was a bolt threw it with a nut on it to hold a heat sink on it . Where bolt went threw trans. there was a little rust on bolt . Any ideas on this as neighbor wants it fixed . It's a 2007 model Coleman Powermate 120/220 vac 5000 / 6250 watt generator. Model PMO545002. A lot of parts have been discontinued from manufactuer so an idea of where to get parts would be nice too . I, along with an electrical genius friend, as well as an auto mechanic friend ,think that it could be the AVR. But , I guess that it could also be the rotor , field coil, or possibly the brushes or a combo of any of them . Thanks for any and all help !
Whizkid
P.S. Sorry so long