Generator Inspection - Segway VILLIAN SSV Series Service Manual

ELECTRICAL SYSTEM

Generator inspection

There are three types of alternator faults: short circuit,
disconnection, or rotor magnetic loss. Short-circuiting
one of the coils or disconnecting the wire will result in low
output or no output at all. A loss of the magnetic field of
the rotor may be caused by a drop or by placing the AC
generator near the electromagnetic field, thereby hitting
the magnetic field of the AC generator or simply due to
aging, resulting in low output. To check the output voltage
of the alternator, perform the following procedures.
Remove rear fender (see Chapter "Frames")
Disconnect the alternator connector 【A】 (1, 2, 3 in the connector are magneto three-phase outgoing
lines)
Connect the handheld tester as shown in the following table
Start the engine. Run it at the speed shown in the table. Note the voltage reading (three measurements
in total).Ac generator output voltage
Range tester
250 V AC
If the output voltage is within the value in the table, the alternator is operating normally and the
regulator/rectifi er has been damaged. A much lower reading indicates that the AC generator is defective.
Check the stator coil resistance as follows:
Stop the engine
Disconnect the AC generator connector
Connect the handheld tester as shown in the table below.
Pay attention to the readings (3 measurements in total).
Stator coil resistance
Range tester
×1 Ω
One yellow wire and the other yellow wire if the resistance is greater than that shown in the table, or
show nothing. Read the (infi nity) of any two wires, the stator has an open circuit and must be replaced.
Less resistance means that the stator is short-circuited and must be replaced.
Using a handheld tester, measure the resistance between each yellow lead with the engine. Any reading
less than infi nity must be replaced.
If the stator coil has normal resistance, but the voltage check shows that the AC generator is faulty then
the rotor magnetism may have weakened and the rotor must be replaced.
Tester connection
（+）
One Yellow wire
Tester connection
（+）
One Yellow wire
（–）
Another Yellow wire
（–）
Another Yellow wire
14 - 14
A
Reading
@3000 rpm
36~54 V
Reading @3000 rpm
0.30 _ 0.49Ω