Yamaha EF2000iS - Inverter Generator, Service Manual

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5-18
ELEC
GENERATOR SYSTEM
GENERATOR SYSTEM
TROUBLESHOOTING CHART
WEAK OR NO AC CURRENT
Start the engine.
Check the overload warning light.
DOES NOT LIGHT ON LIGHT ON
Check the AC pilot light.
DOES NOT LIGHT ON LIGHT ON
No load engine speed inspection.
9
Operate the engine with no load.
9
Measure after warming up the engine.
3,000 r/min / Economy control switch-ON
4,500 r/min / Economy control switch-OFF
GOOD OUT OF SPECIFICATION
Inspect the generator condition.
1. Connected electrical device is overloaded.
2. The generator overheated.
3. Connected electrical device requires large amount
of AC output voltages.
NO YES
Refer to “OVERLOAD WARNING LIGHT” in
CHAPTER 2.
Check the throttle control system.
Refer to “THROTTLE CONTROL SYSTEM” in
CHAPTER 6.
Wire harness inspection
Check the terminal of the connector for contamination
or rust, and connector for proper connection.
GOOD DISCONNECTED
Connect or replace the connector.
Check the pilot light.
Main coil voltage inspection
9
Start the engine with no load.
9
Economy control switch-OFF.
9
Connect the pocket tester to the White leads.
9
Measure the voltage. (Tester range: AC 300 V)
GOOD
TOO LOW
DOES NOT GENERATE
W
W W
Y
Y Y
R
T S
Main coil AC voltage:
260–390 V at 20 °C (68 °F)
Magnetic force is weak.
Replace the magneto rotor.
Replace the stator assembly.
Main coil resistance measurement
9
Stop the engine.
9
Measure the resistance between the White leads.
(Tester range:
Ω ×
1)
SPECIFICATION OUT OF SPECIFICATION
W
W W
R
T S
Main coil resistance:
1.6
Ω
± 20 % at 20 °C (68 °F)
7DK40-05 6/12/09 6:01 PM Page 42