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I put my wolf 800 generator away working and it now runs ok but will not generate. I have tested the 4 leads at the plug and there are no breaks. The reset switch is ok. could it be the sealed black box that i can't test?

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Hi and welcome to FixYa, I am Kelly.
Test the capacitor. This is an inverter type generator and the armature / rotor is an induction field with a varistor across the armature. They work via magnetics generated by the rotor. That initial AC voltage goes thorough a capacitor and diode to make DC to increase the field strength to reach the final output voltage.

The capacitor needs to be checked (usually has yellow wires) as does the diode pack. Flashing the field in an inverter type generator is usually NOT successful as there are no brushes to the armature / rotor. Isolate the capacitor by removing ONE set of leads off of ONE side. Then set your meter to R x 10K and probe the terminals. You should see a momentary jump and then it goes toward infinity. Reversing the leads each time you probe the capacitor should yield the same jump and drift toward infinity. No Jump = bad cap.

Also look for a micro- circuit breaker in the control panel area. If your unit has the micro breaker you will usually see a tiny orange plunger sticking out about 1/8" Press it back in and test the unit. If it stays reset great. If it pops right away.. there is a short in the capacitor or to and or from the capacitor.

The diode pack can have 3 or 4 wires on it. One wire being common to all of the other wires with meter leads in one polarity. Reversing the test leads across the diode it will read open.

The wires from the capacitor when removed should read resistance to each other. NO resistance - bad stator or broken wires! :( The yellow wires / 2 capacitor wires usually have some male / female round plug in connections. Make sure the connections do not appear that they have been HOT. If you note the connections have been hot try cleaning the terminals first. Most of the time the only option is to cut out the connector and splice the wires.

IF the stator winding checks out good as does the capacitor and doide pack the most probable suspect will be the varistor of the armature / rotor. (
Thanks for choosing FixYa,
Kelly

Posted on Apr 08, 2011

  • zorki Jun 03, 2011

    It would be nice if a schematic was available1
    Otherwise good advice

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