TP-6735 7/17 77Section 5 Component Testing and Adjustment
5.10.2 Fault Shutdown Switches
Check the low oil pressure and high engine temperature
shutdown switches on the engine by performing the
following tests. If the sensor does not function as
described, replace it.
Hazardous voltage. Moving parts.
Will cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
DANGER
Servicing the generator set when it is operating. Exposed
moving parts will cause severe injury or death. Keep
hands, feet, hair, clothing, and test leads away from the belts
and pulleys when the generator set is running. Replace
guards, screens, and covers before operating the generator
set.
Short circuits. Hazardous voltage/current will cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Temperature Sensor (CTS)
The temperature sensor (CTS) is used to monitor
engine temperature for the high engine temperature
fault shutdown (HE). See Figure 5-22 for the coolant
temperature s ensor location. Press the OFF button on
the controller to stop the generator set and allow the
generator set to cool. Disconnect the CTS and use an
ohmmeter to measure the resistance across the sensor.
The sensor resistance varies with temperature and
should be within the values shown in Figure 5-24. If the
resistance is very low (indicating a short circuit) or very
high (indicating an open circuit), r eplace the CTS.
Note: The C TS is located in the engine oil pan. Drain
the engine oil before removing the switch.
Temperature, _C(_F)
Resistance, Ohms
30 (86) 2100--2400
100 (212) 180--200
Figure 5-24 Temperature Sensor CTS Resistance
Readings
Low Oil Pressure (LOP) Switch
The low oil pressure (LOP) switch is located under the
engine air cleaner. See Figure 5-25.
1
tp6519
1. Oil pressure switch
Figure 5-25 Oil Pressure Switch Location (under the
air cleaner)
Remove the LOP switch and install an oil pressure
gauge to verify that the engine oil pressure is within the
range specified in Section 1, Specifications, before
testing or replacing the LOP switch. To test the LOP
switch, reinstall the switch and start the generator set. If
the unit shuts down, disconnect lead 13 from the LOP
switch and reset the controller. Restart the generator
set and verify that it does not shut down. A s uccessful
restart indicates a faulty LOP s witch. Replace switch.
To Next Page
Loading...
