TP-6881 7/15 95Section 5 Component Testing and Adjustment
5.12.2 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.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Servicing the generator set when it is operating. Exposed
moving parts can 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 can 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 (OTS)
The temperature sensor (labelled OTS on the wiring
diagram and schematic drawing) is used to monitor
engine temperature for the high engine temperature
fault shutdown. See Figure 5-22 for the temperature
sensor location. Press the OFF button on the controller
to stop the generator set and allow the generator set to
cool. Disconnect the temperature sensor (or see the
note, below) 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 5-23. If the resistance is very low
(indicating a short circuit) or very high ( indicating an
open circuit), replace the OTS.
Note: Because the temperature sensor can be difficult
to reach, the resistance can be measured across
pins 9 and 10 on connector P1 at the generator
set controller, if desired. Disconnect P1 from the
controller before checking the resistance across
P1-9 and P1-10.
Note: The temperature sensor 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 5-23 Temperature Sensor OTS Resistance
Readings
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