Kohler 14RESA Manual page 95

WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Testing live electrical circuits.
current can cause severe injury or death. Have trained and
qualified personnel take diagnostic measurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death. Electrocution is possible
whenever electricity is present. Ensure you comply with all
applicable codes and standards.
generator set, transfer switch, and related equipment and
electrical circuits. Turn off the main circuit breakers of all
power sources before servicing the equipment. Never contact
electrical leads or appliances when standing in water or on wet
ground because these conditions increase the risk of
electrocution.
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage.
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Separate Excitation Procedure
Perform the following procedure to use an external
voltage source to excite the main field (rotor).
1. Disconnect the black FN and FP leads from the
alternator at the brush holder terminals.
2. Connect a DC ammeter, 10-amp fuse, and a
12-volt automotive battery to the positive (FP) and
negative (FN) brush leads as shown in Figure 6-3.
Note and record the ammeter reading.
Note: The approximate ammeter reading should
be the battery voltage divided by the
specified rotor resistance. See Section 1,
Specifications, for specified rotor resistance
values.
TP-6805 8/15
Moving parts.
Hazardous voltage or
Electrically ground the
Do not contact electrical
Example:
12 volts (battery voltage)
4 ohms (rotor resistance)
3. Start the engine and check that the ammeter
reading remains stable.
reading indicates a shorted rotor. A meter reading
decreasing to zero or an unstable reading
suggests a running open. Refer to Section 6.4,
Main Field (Rotor), to test the rotor. If the ammeter
reading is stable, proceed to step 4.
4. Check for AC output across the stator leads; see
Section 6.3, Stator. Compare the readings to the
AC output values
Specifications. If the readings vary considerably, a
faulty stator is likely. Refer to Section 6.3, Stator,
for further information.
5. If this test shows that the rotor and stator are in
good condition, check the wiring and fuses. Check
the controller settings and connections.
Section 4, Controller.
FN
FP
-
+
7
8
1. FN lead disconnected in step 1
2. FP lead disconnected in step 1
3. 10-amp fuse
4. DC ammeter
5. 12V battery
6. Brushes
7. Slip rings
8. Main field (rotor)
Figure 6-3 Separate Excitation Connections
Section 6 Component Testing and Adjustment
3 amps
=
(rotor current)
An increasing meter
shown in Section 1,
1 2 3
4
6
+ -
TP-6735
See
5
95