Lincoln Electric Classic 300 MP Service Manual page 58

LINCOLN ELECTRIC
9. Be sure that there are no loads of any kind across any of the stator windings. The exciter winding
should be the only stator winding connected at this time. Examine stator wiring for damage,
pinched leads, chaffed insulation, etc. If necessary, disconnect and insulate the stator output leads,
secure them so they cannot be damaged by moving parts. See Wiring Diagram.
10. Re-start the machine and measure the rotor voltage.
If the rotor voltage continues to read significantly lower than 140 VDC, the stator is probably
defective and should be replaced.
* Voltages shown in this document are for a machine operating at normal temperature. Voltage
readings may be slightly higher if the machine is cold.
11. Using a 5/16" nutdriver, remove the four screws securing the exciter cover to the machine.
Figure F.22 – Exciter cover location
Classic® 300 MP Service Manual
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