Kohler EKOZD Series Service page 179

10.5 Stator
WARNING
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
Servicing the alternator. Hot parts can cause severe
injury or death. Avoid touching the alternator field or exciter
armature. When shorted, the alternator field and exciter
armature become hot enough to cause severe burns.
WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
High voltage test. Hazardous voltage can cause severe
injury or death. Follow the instructions of the test equipment
manufacturer when performing high-voltage tests on the rotor
or stator. An improper test procedure can damage equipment
or lead to generator set failure.
The stator consists of a series of coils of wire laid in a
laminated steel frame. The stator leads supply voltage
to the AC load and exciter regulator.
Before testing the stator, inspect it for heat discoloration
and visible damage to the housing lead wires and
exposed and varnished areas of the frame laminations.
Be sure the stator is securely fastened in the stator
housing.
The stator produces electrical output (AC) as the
magnetized main field rotates within the stator windings.
Test the condition of the stator according to the following
procedure.
Leads 1, 2, 3, and 4 are the generator output leads on
single-phase models. Leads 1 through 12 are the output
TP-6953 7/19
Moving parts.
leads on three-phase models. Leads 60, 61, and 62 are
the auxiliary power winding leads.
schematic in Figure 10-10 or Figure 10-11 when
performing the following tests.
1 2 61
Figure 10-10 Alternator Stator Leads (Single Phase)
62 60 61 7
1
Figure 10-11 Alternator Stator Leads (Three Phase)
Stator Test Procedure
1. Press the OFF button on the generator set
controller.
2. Disconnect the generator set engine starting
battery, negative (- ) lead first.
3. Check the generator output lead connections. See
wiring diagram ADV-5875 in the Appendix to
determine the voltage connection of the unit. Make
note of the voltage connection for reassembly later.
4. Disconnect all the stator leads to isolate the
windings. To check the stator continuity, set the
ohmmeter on the R x 1 scale. Check the stator
continuity by connecting the meter leads to the
stator leads as shown in Figure 10-10 for single
phase or Figure 10-11 for three phase.
Figure 10-12 for single-phase or Figure 10-13 for
three-phase continuity test results. Perform the
stator tests on all the stator windings.
Section 10 Alternator Component Testing and Adjustment
Refer to the
60 62 3
TP- 6898- 3
10 8 11 9 12
4 2 5 3 6
TP- 6898- 3
4
See
179