Kohler EKOZD Series Service page 201

6. Repair the leads if damaged or open. Solder and
insulate the splices. Use new sleeving as needed
when tying leads to the core.
7. Using a megohmmeter, apply 500 volts DC to each
set of windings and then to each winding and the
stator core (ground). See Figure 11-16. Place the
stator assembly on a non-conductive surface when
performing the test. Follow the instructions of the
megohmmeter manufacturer when performing this
test.
A reading of
(1/2 megohm) and higher indicates the winding is
good.
A reading of less than 500 kOhms (approximately)
indicates deterioration of winding insulation and
possible current flow to ground.
8. Repair or replace the stator assembly if the test
shows a winding is shorted to ground. Repair the
leads if damaged or open. Solder and insulate the
splices. Use new sleeving as needed when tying
leads to the core.
1 4 2 5 3
Make megohmmeter connections across:
1. 1 and 4 leads
2. 2 and 5 leads
3. 3 and 6 leads
4. 7 and 10 leads
5. 8 and 11 leads
6. 9 and 12 leads
Figure 11-16 Stator Winding High Voltage Test
TP-6953 7/19
approximately 500 kOhms
6 7 10 8 11 9
M
TP-5783-3
7. 1 lead and core (ground)
8. 2 lead and core (ground)
9. 3 lead and core (ground)
10. 7 lead and core (ground)
11. 8 lead and core (ground)
12. 9 lead and core (ground)
11.8 FRX Alternator Winding
Maintenance
Be aware that dirt covering the stator or rotor windings is
very conductive, especially when moisture is present. It
is important to keep the rotor, stator, exciter, and rotating
electronics clean and dry. It is highly recommended to
install generator heaters, placed inside the stator frame,
to reduce condensation from forming on the alternator
windings.
The condition of the alternator windings can be
monitored by regularly using a Megger. A Megger is a
high voltage ohmmeter that can be used to measure
insulation to ground resistance. The usual setting is
500 VDC so it is important to disconnect electronics
from the rotor, stator, or exciter. A new, clean, and dry
winding can be expected to be 10 megohms or more.
The Megger reading may drop over time as the winding
accumulates dust, dirt, or moisture. If the reading
drops to 500 kOhms or 0.5 megohms, consider
cleaning, drying, or rewinding the alternator.
It is best to call a motor rewind shop for assistance.
Cleaning is normally done with solvents, compressed
air, or is steam cleaned on a disassembled alternator.
12
Section 11 Alternator Component Testing and Adjustment 201