Winco Rotating Field Design Troubleshooting Guide - Manual (Page 2)

b. Discharge capacitors by momentarily grounding capacitor terminals to
the capacitor case. (Failure to ground capacitors may cause a shock)
c. Disconnect capacitor leads.
d. Using an VOM (ohm meter) set at 200K ohms. Connect meter leads to
the two sets of terminals on one capacitor. Ohm meter should read “0”
and slowly move to an open circuit. (5 to 10 seconds) (the battery in ohm
meter is charging capacitor) Reversing the meter leads will cause the
Ohm meter to count down to zero. Then charge up and move to open
circuit.
e. Repeat step (d) for any remaining capacitors. (there may be up to three
capacitors depending on the model of generator)
8. Check stator capacitor leads for continuity and grounding.
a.
There should be continuity between leads.
b. The resistance values are shown in table #1.
c. There should not be any reading to ground.
9. Check stator output power leads for continuity, resistance and grounding.
a.
There should be continuity between leads.
b. The resistance values are shown in table #1.
c. There should not be any reading to ground.
10. Check for continuity between the capacitor leads and power leads in the stator.
a. There should not be continuity between these two sets of leads.
11. Remove stator/shell assembly.
12. Unbolt the diode(s) from mounting bracket or the fan on rotor.
13. Check diode(s) with an ohm meter. Most meters use a special setting for testing
a diode. If your meter does not have special setting use the RX1 ohms scale.
a. Meter leads should be placed on either end of one diode, check meter for
current flow. (Diode must be unbolted to test)
b. Reverse meter leads, check meter for current flow.
c. Current flow (reading) should be detected in only one direction. If diode
reads current flow in both or neither direction it should be replaced.
d. Depending on model. Repeat step a thru c for the other diode if installed.
NOTE: All of the two diode systems use one forward polarity and one
reverse polarity diode.
14. Check rotor leads for continuity and grounding. Place meter leads on solder end
of diode(s). At least one of the diodes must be disconnected from the rotor to
check continuity and resistance. There should be continuity between leads but no
reading to ground See table #1 for resistance values.
15. Replace any defective parts and reassemble generator.
16. Flash field according to diagram #1.
RFB - Rotating Field with Brush type excitation.
17. Disconnect wires from rectifier and check rectifier.
18. Check rectifier leads from the stator for continuity and grounding.
a.
There should be continuity between leads.
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