Winco MD6L - Manual (Page 14)

60706-121 PAGE 12
LOW VOLTAGE (0 VOLTS)
Loss of Residual Magnetism Flash the exciter stator with a small 9 volt battery. Consult factory for
procedure.
Defective Main Stator Measure stator resistance (G1 TO N & G3 TO N ). Check for ground
shorts. Replace if defective.
Short in AC Wiring. Turn off all circuit breakers for the lights and disconnect all external
loads. Check all the AC wiring in the control cabinet for shorts. Repair or replace as required.
FLUCTUATING VOLTAGE
Erratic Engine Speed Refer to the Engine manufacturer’s maintenance manual.
Loose Terminal or Load Check all AC wiring connections.
HIGH VOLTAGE
Engine Speed too High Check engine speed, reset to 61.5 HZ no-load.
GENERATOR OVERHEATING
Air Vents Obstructed Clear obstruction.
High Intake Air Improve ventilation. Allow at least two feet clearance around generator.
Temperature
ENGINE OVERHEATING
Engine Exhaust Leaking Repair exhaust system.
into Housing
Generator Overloaded Measure load being run and compare with nameplate rating. The load or
Unbalanced on each leg should be as evenly balanced as possible and should not
exceed the rated current on any leg.
Shorted Turns in Either the Measure rotor and stator resistance for shorted turns.
Rotor or Stator Replace if defective.
GENERATOR NOISY AND/OR VIBRATES
Loose Sheet Metal Check nuts, bolts and doors for tightness.
Rotor Rubbing Repair or replace defective part.
Bearing Defective Replace bearing.
Rotor Unbalanced Rotors are factory spin balanced on special computer controlled ma-
chines before assembly. Small washers or bars are used as balancing weights. Check inside the
generator for loose or missing parts. If any ` balance weights have broken loose, do not run the unit. Consult
your Winco dealer or the factory.