Kohler 27EFOZ, Руководство по обслуживанию

Страница: 50 / 80

TP-5936 7/04 38 Section 8 Component Troubleshooting
Note: Before performing ohmmeter checks, disconnect
the generator set battery to prevent damage to
the ohmmeter.
To further check the generator set components,
disconnect the battery and remove the wiring harness
plugs from the controller circuit board. Use an
ohmmeter to check the continuity of the components
and to isolate inoperative components.
Refer to
Figure 8-2.
Component Ohmmeter Connections Procedure Results
Start/stop switch Connect the ohmmeter to the P2-6
and P2-4 leads. Place the ohmmeter on
the R x 1000 scale.
Place the rocker switch
in the START position. If the switch is functional, zero
ohms continuity. Any resistance
other than zero or very low ohms,
replace the switch.
Connect the ohmmeter to the P2-6
and P2-5 leads. Place the ohmmeter on
the R x 1000 scale.
Place the rocker switch
in the STOP position. If the switch is functional, zero
ohms continuity. Any resistance
other than zero or very low ohms,
replace the switch.
K20 relay coil and
wiring Connect the ohmmeter to the P1-4
and P1-9 leads. Place the ohmmeter on
the R x 1 scale. If functional, 85 ohms. Low
resistance, shorted C relay coil
and/or wiring. High resistance,
open C relay and/or wiring.
Replace the controller board.
Starter solenoid
(S relay) Connect the ohmmeter to the
P4-22 lead and the battery positive
(+) cable.
Note : The J4 and P4
leads must be disconnected to
perform this test.
Place the ohmmeter on
the R x 1 scale. If functional, approximately
0.5--0.6 ohms at 27
°
C (80
°
F).
Controller 10-amp
circuit breaker and
wiring Connect the ohmmeter to the
battery positive (+) cable and the
P1-14 lead.
Note : The J4 and P4
leads must be connected to
perform this test.
Place the ohmmeter on
the R x 1000 scale. If functional, zero or very low
ohms. No reading (infinity), open
circuit or circuit breaker tripped.
Main field (rotor) Disconnect the P10 and P11
connectors and connect the
ohmmeter to the P10-1 and P10-2
leads. Place the ohmmeter on
the R x 1 scale. If the resistance readings match
those specified in Section 1,
Specifications, the rotor is
functional. Low resistance, rotor
windings shorted. High resistance,
rotor windings open.
B1/B2 stator windings Connect the ohmmeter to the
P11-1 and P11-2 leads.
Note : Disconnect P11 and J11 to
perform this test.
Place the ohmmeter on
the R x 1 scale. If the resistance readings match
those specified in Section 1,
Specifications, the B1/B2 windings
are functional. Low resistance,
B1/B2 windings shorted. High
resistance, B1/B2 windings open.
P1 ground connection Connect the ohmmeter to the P1-9
and ground. Place the ohmmeter on
the R x 1 scale. If functional, zero ohms
(continuity). Any other reading
indicates a poor ground
connection.
High exhaust
temperature (HET), low
coolant (LCS) safety
shutdown switches Connect the ohmmeter to the
P1-15 and engine block (ground).
Note : Remove and isolate the
LOP switch lead.
Place the ohmmeter on
the R x 1000 scale. If functional, open circuit. Any
continuity suggests an inoperative
temperature switch(es). Replace
the switch(es).
Low oil pressure (LOP)
safety shutdown switch Connect the ohmmeter to the
P13-1 and engine block (ground). Place the ohmmeter on
the R x 1000 scale.
This test is not
conclusive until the
temperature shutdown
switches are checked. If functional, zero ohms
(continuity). Then, disconnect the
LOP switch lead and isolate the
terminal. Meter reading should
show an open circuit.
Figure 8-2 Engine/Generator Component Testing, Relay Controller