Winco 75FPTOC-17 - Manual (Page 10)

Page 8 60706-125 7315-000
TROUBLE SHOOTING TABLE
SYMPTOM CAUSE(S) CORRECTIVE ACTION
No output 1. Circuit breaker open. 1. Reset circuit breakers, replace if defective.
voltage. 2. Defective voltmeter. 2. Check output with another meter, replace meter if defective.
3. Short circuit in the load. 3. Disconnect the load. Check voltage at receptacle cord set.
Check motors, appliances and load leads for short circuit.
Repair short.
4. Defective receptacles. 4. Remove panel cover and check for voltage to the
receptacles. Replace defective receptacles.
5. Loose (or broken) wires or 5. Remove panel cover and check all wiring and connections.
connections in control box. Tighten and/or repair where necessary.
6. Defective rectifier. 6. Test rectifier. Replace if defective.
7. Dirty slip rings. 7. Clean and polish. Use 00 sandpaper or crocus cloth,
never use emery paper.
8. Brushes binding in holders. 8. Check brushes for swelling; replace defective brushes;
clean brush holders.
9. Shorted or open rotor. 9. Measure rotor resistance. Replace rotor if open or shorted.
10.Shorted or open stator. 10. Measure between leads for open or short. Replace stator if
defective.
11.Open transformer. 11. Connect or tighten primary and secondary leads. Check
secondary for open circuit. Replace transformer if defective.
12.Rotating field polarity 12. Check by interchanging F (—) and F (+) leads at the
incorrect. brushes. Inner slip ring is positive F (+) and must be
connected to the (+) terminal of the rectifier. Flash the field
with 12 volts DC.
Low voltage. 1. Engine speed too slow. 1. Check engine speed. Increase RPM if necessary.
2. Generator overloaded. 2. Reduce load if it is higher than the rated capacity of the
generator. (See generator nameplate).
3. Inadequate engine horsepower. 3. Generator requires 2 HP/1000 watts output. Obtain
larger engine if necessary.
4. Incorrect field excitation. 4. Check for worn brushes and weak or broken brush springs;
(No-load output low.) replace as required. Check input AC voltage to rectifier.
Check rectifier output DC voltage to positive DC brush. If no
DC voltage is present at the brush, replace the rectifier.
Check for dirty slip rings. Clean them if they are dirty.
5. Connection of current 5. Have qualified service technician recheck and correct the
transformer secondary leads connections.
not correct.
CLEANING & INSPECTING THE GENERATOR
Use a vacuum cleaner or dry low pressure compressed air
(regulated at 25-35 PSI) to clean the generator periodically.
WARNING: Equipment Damage
DO NOT CLEAN THE GENERATOR WHILE IT IS RUNNING.
Proceed as follows:
1. Remove ventilated control box cover. Vacuum or blow vents
and screen clear of dust or debris. Wash them down with
cleaning solvent if necessary.
2. Remove cooling fan shroud. Vacuum or blow dust from
screen and fan blades. Wipe them off with cleaning solvent if
necessary.
3. Vacuum or blow dust and other debris from inside genera-
tor and control box.
4. With panel cover removed, inspect the brushes for wear,
and inspect the wiring for correct routing, fraying insulation,
and secure connections.
5. Replace panel cover and cooling fan shroud.
GENERATOR STORAGE
Before storing the generator, apply a heavy coat of grease to
the splined input shaft. Store the generator in a sheltered
area, where it is protected against snow, rain, and excessive
dust.