Smart Power Systems ER Series - Manual (Page 42)

Smart Power
®
Systems
A. C. MODULAR GENERATOR SYSTEM
Page 41 of 52
d. The stator field may be shorted or open. With a flashlight, check the generator
windings visible through the ventilation slots. If the windings appear burnt in any
area, the generator must be replaced. If the windings are not burnt, disconnect
wires 1, 2, 3, and 4 from the terminal strip located in the generator wiring
enclosure and make resistance measurement. The resistance between wires 1
and 2, and wires 3 and 4 should be between essentially 0 ohms. Contact Smart
Power
®
Systems at (231) 832-5525 if any problems are found.
WARNING:
Do not attempt to measure stator field resistance while the system is operating.
Electrical shock may occur.
e. The exciter field may be shorted or open. With a flashlight, check the generator
windings visible through the ventilation slots. If the windings appear burnt in any
area, the generator must be replaced. If the windings are not burnt, disconnect
the exciter field from the field capacitor. Measure the resistance of the exciter
field using an ohmmeter. The resistance of the exciter field should be between
.27 and .29 ohms. Contact Smart Power
®
Systems at (231) 832-5525 if the
resistance is outside this range.
WARNING:
Do not attempt to measure the exciter field resistance while the system is operating.
Electrical shock may occur.
f. Exciter field capacitor may be faulty. Disconnect the exciter field from the field
capacitor. Using a screwdriver, short leads of capacitor together to discharge
capacitor. Measure capacitance using a capacitance meter. Capacitor should
have capacitance between 47 and 53 microfarads.
WARNING:
Do not attempt to test the field capacitor with the system running. Electrical shock
may occur.
g. The generator drive motor or coupling is faulty. Observe the generator while the
system is engaged. If the coupling is not turning, or if it is turning but the
generator is not, one or more of the coupling components may be damaged and
must be replaced. Also, verify that the coupling halves are mating. If the
coupling halves are not mating, remove the hydraulic motor from the generator
to inspect coupling and the rubber insert between the coupling halves. Replace
components as necessary, reposition and tighten coupling setscrew so both
halves of the coupling are mating correctly.