Winco W15PTOS/D - Manual (Page 10)

Page 8 60706-179-8100
SERVICE DIAGNOSIS
Low Speed
Loss of residual magnetism. Usually occurs only after
disassembly of field frame or severe mechanical stress/abuse. Back flash the 120 volt circuit with 12 volts DC
Grounded or shorted rotor winding. Replace grounded rotor assembly.
Open excitor circuit in stator Repair or replace statorassembly.
Defective diode(s) on rotor. Replace defective diode(s).
Broken or corroded connection. Clean and tighten generator and receptacle connections.
NO OUTPUT VOLTAGE
Clogged ventilating inlet and/or outlet. Clean screens, make sure interior of generator is unobstructed.
EXCESSIVE HEATING
Generator is spinning to fast, slow tractor down. Readjust or Replace as required
HIGH OUTPUT VOLTAGE
Shorted or grounded rotor coil. Test and replace if defective.
Replace as required
High line loss. Indicated by lower voltage at load than at
generator terminals. Increase size of line wiring. Might also be the result of loose
connection indicated by excessive heating at the loose
connection terminal.
Check for overload on the tractor or undersized.
Check tractor governor. Tight or defective throttle levers
and joints.
Worn or defective tractor engine
(see engine manufacturers
check list.)
1. Undersized/overloaded.
2. Defective governor.
3. Low power - worn engine.
LOW OUTPUT VOLTAGE
POSSIBLE CAUSE REMEDY
VOLTAGE UNSTEADY/ LIGHTS FLICKERING
Drive line knuckles out of sync. (See Figure 5.) Resync drive line halves.
PTO drive line alignment. Realign within 10 degrees.
Shorted stator winding. This can be identified by the use of an
internal “growler” at a competent rewinding shop.
Grounded stator. Check winding by test lamp or high potential
tester from stator leads to lamination.
Open stator circuit. Measure circuit between leads with an
ohmmeter. Should have a circuit between any pair of leads.
Replace stator. (Include generator model and serial number
on the order.)
Same as above.
Same as above.
Defective voltage regulator.
Defective stator Repair or replace as required
Defective Capacitors Test and replace if defective.