Kohler 7.5EOR Service page 50

5. Contact the ohmmeter leads and readjust the
ohmmeter to zero ohms.
resistance of the stator windings by connecting the
meter leads to the stator leads 1-2, 3-4, etc. See
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
lead 55, make the connection before the
inline fuse.
Note: The stator resistance varies directly with
increased temperature.
6. If any of the stator readings varies during the
previous checks, replace the stator.
7. Check the stator for a short to ground condition
using a megohmmeter.
Figure 7-24. Apply 500 volts DC to any stator lead
from each winding and the stator frame. Follow the
megohmmeter manufacturer's instructions for
using the megohmmeter. Repeat the test on the
other leads until all 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, replace the stator.
50 Section 7 Generator Troubleshooting
Check the cold
See Figure 7-23 and
F1 F2
9
F+
AC
AC
AC
8
1. Voltage regulator power supply leads
2. Sensing leads (208--240 volts nominal)
3. Stator windings
4. Main field (rotor)
5. Rectifier module
6. Frame connection
7. Megohmmeter
8. Armature
9. Exciter field
Figure 7-23 Megohmmeter Connections on the
Stator (4-Lead)
3
F1 F2
4
9
7
8
1. Voltage regulator power supply leads
2. Sensing leads (208--240 volts nominal)
3. Stator windings
4. Main field (rotor)
5. Frame connection
6. Megohmmeter
7. Rectifier module
8. Armature
9. Exciter field
Figure 7-24 Megohmmeter Connections on the
Stator, (12-Lead)
1 4
1
3 6
P8
V1
V4
3 4
66
55
4
F--
5
B1 B2 1 2
6
7
TP-5936517
1
2
5
6
TP-5936518
TP-6073 4/06
2
3