PART 2
AC GENERATORS
Section 2.4
Diagnostic Tests
TEST 15 – CHECK FOR OVERLOAD
CONDITION
Discussion
An “overload” condition is one in which the generator rated
wattage/amperage capacity has been exceeded. To test for an
overload condition on an installed unit, the best method is to
use an ammeter. See “Measuring Current” in Section 1.2.
Procedure
Use a clamp-on ammeter to measure load current draw, with the
generator running and all normal electrical loads turned on.
Results
1. If the unit is overloaded, reduce loads to the unit’s rated
capacity.
2. If unit is not overloaded, but rpm and frequency drop
excessively when loads are applied, go to Test 16.
TEST 16 – CHECK VOLTAGE AND
FREQUENCY UNDER LOAD
Discussion
It is possible for the generator AC output frequency and voltage
to be good at no-load, but they may drop excessively when
electrical loads are applied. This condition, in which voltage
and frequency drop excessively when loads are applied, can
be caused by (a) overloading the generator, (b) loss of engine
power, or (c) a shorted condition in the stator windings or in
one or more connected loads.
Procedure
1. Connect an accurate AC frequency meter and an AC
voltmeter across the stator AC power winding leads.
2. Start the engine, let it stabilize and warm-up.
3. Apply electrical loads to the generator equal to the rated
capacity of the unit.
4. Check the AC frequency and voltage. Frequency should
not drop below approximately 58-59 Hertz. Voltage
should not drop below about 230 volts (plus or minus 2
percent).
Results
1. If frequency and voltage drop excessively under load, go
to Test 15.
2. If frequency and voltage under load are good,
discontinue tests.
Page 36
Summary of Contents for CorePower
Page 8: ...Page 6 Specifications ...
Page 9: ...Page 7 Specifications ...
Page 10: ...Page 8 NOTES ...
Page 42: ...NOTES PART 3 TRANSFER SWITCH Page 40 ...
Page 50: ...Page 48 NOTES PART 3 TRANSFER SWITCH ...
Page 55: ...ENGINE DC CONTROL PART 4 Page 53 NOTES ...
Page 82: ...Page 80 PART 4 ENGINE DC CONTROL NOTES ...
Page 91: ...Page 89 NOTES DISASSEMBLY PART 5 ...
Page 92: ...Page 90 PART 5 DISASSEMBLY Section 5 2 Exploded Views Control Panel ...
Page 94: ...Page 92 EV Powerhead Corepower PART 5 DISASSEMBLY Section 5 2 Exploded Views ...
Page 96: ...Page 94 Enclosure PART 5 DISASSEMBLY Section 5 2 Exploded Views ...
Page 100: ...Page 98 Air Fuel System PART 5 DISASSEMBLY Section 5 2 Exploded Views ...
Page 102: ...Page 100 PART 5 DISASSEMBLY NOTES ...
Page 104: ...Section 6 Page 102 Wiring Diagram Drawing 0H7182 C ELECTRICAL DATA PART 6 ...
Page 105: ...Section 6 Page 103 Electrical Schematic Drawing 0H7182 C ELECTRICAL DATA PART 6 ...
Page 107: ...APPENDIX A SUPPLEMENTAL WORKSHEETS Page 105 Appendix A Supplemental Worksheets 105 ...
Page 114: ...Page 112 NOTES ...
Page 115: ......