Kohler EKOZD Series Service page 180

Leads
1 and 2 3 and 4
60 and 61 61 and 62
1 and 3 1 and 4
2 and 3 2 and 4
1 and 60 1 and 61
2 and 60 2 and 61
3 and 60 3 and 61
4 and 60 4 and 61
Any stator lead and ground on stator housing or
frame laminations
Figure 10-12 Stator Continuity Test Results on a Good
Stator (Single Phase)
Leads
1 and 4 2 and 5
7 and 10 8 and 11
60 and 61 61 and 62
1 and 2 1 and 3
1 and 8 1 and 9
2 and 7 2 and 8
3 and 7 3 and 8
7 and 8 7 and 9
1 and 60 1 and 61
2 and 60 2 and 61
3 and 60 3 and 61
7 and 60 7 and 61
8 and 60 8 and 61
9 and 60 9 and 61
Any stator lead and ground on stator housing or
frame laminations
Figure 10-13 Stator Continuity Test Results on a Good
Stator (Three Phase)
5. Check the cold resistance of the stator windings by
connecting the meter leads to the stator leads as
shown in Figure 10-12 or Figure 10-13.
Section 1, Specifications, for the stator resistance
values. If the stator resistance test is inconclusive,
perform a megohmmeter test on the stator as
described in the next step.
Note: Consider the stator functional if the
resistance reading (continuity) is low and
there is no evidence of shorted windings
(heat discoloration).
Note: When taking an ohmmeter reading using
leads 60, 61, or 62, make the connection
before the fuse if used.
Note: The stator resistance can vary directly with
increased temperature.
If any of the stator readings vary during the
previous checks, replace the stator.
180 Section 10 Alternator Component Testing and Adjustment
Continuity
—
Yes
60 and 62
—
—
1 and 62
No
2 and 62
3 and 62
4 and 62
No
Continuity
3 and 6
9 and 12
Yes
60 and 62
1 and 7
2 and 3
2 and 9
No
3 and 9
8 and 9
1 and 62
2 and 62
3 and 62
No
7 and 62
8 and 62
9 and 62
No
See
6. Check the stator for a short-to-ground condition
using a megohmmeter. See Figure 10-14 for a
single-phase megohmmeter connections and
Figure 10-15 for
connections.
Apply 500 volts DC to any stator lead from each
winding and the stator frame.
megohmmeter manufacturer's instructions for
using the megohmmeter. Repeat the test on the
other leads until all of the stator windings have
been tested. A reading of 1.5 MOhms and higher
indicates the stator is functional. A reading of less
than 1.5 MOhms indicates deterioration of the
winding insulation and possible current flow to
ground; if so, repair or replace the stator.
FN FP
9
F+
AC
AC
AC
F-
8
M
1. Auxiliary power for exciter field and
voltage regulator
2. Voltage sensing (A, B, and NEU)
leads (208- 240 volts nominal)
3. Stator windings
4. Main field (rotor)
Figure 10-14 Megohmmeter Connections on Stator
(Single Phase)
1
9
FN FP
AC
AC
AC
5
8
7
M
1. Auxiliary power for exciter field and
voltage regulator
2. Voltage sensing
(A, B, C, and NEU) leads
(208- 240 volts nominal)
3. Stator windings
Figure 10-15 Megohmmeter Connections on Stator
(Three Phase)
three-phase megohmmeter
Follow the
1
60
62 61
3 4
4
5
1 2
7
5. Rectifier module
6. Frame connection
7. Megohmmeter
8. Exciter armature
9. Exciter field winding
60
62 61
F+
F-
4
4. Main field (rotor)
5. Rectifier module
6. Frame connection
7. Megohmmeter
8. Exciter armature
9. Exciter field winding
TP-6953
2, 3
6
TP-6878-3
2, 3
6
TP-6878-3
7/19