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COMPONENT STATIC TESTING
TESTING THE EXHAUST TEMPERATURE SWITCH
An exhaust temperature switch is located on the water
injected exhaust elbow. Normally closed, this switch will
open and the ECU will interpret this as a high exhaust tem-
perature and open the K2 run relay stopping the generator.
The exhaust temperature LED on the panel will illuminate.
The switch opens at 260- 270°F (127- 132°C). This switch
resets (contacts close) at approximately 225°F (107°C).
When testing,continuity should be found (switch is
normally closed).
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COOLANT (WATER) TEMPERATURE SENSOR
A temperature sensor is located at the thermostat housing.
This sensor sends a DC voltage to the ECU that it interprets
as engine (antifreeze) coolant temperature. Should this
voltage reach a set value, the ECU will interpret this as a
high temperature and open the K2 run relay, stopping the
generator. The overheat LED on the panel will then
illuminate.
Test the sensor as shown. Resistance at room temperature
should indicate
10,000
Ohfl!S.
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HOUSING
TESTING RESISTANCE
TESTING THE OIL PRESSURE SENSOR
The oil pressure sensor sends a DC voltage to the ECU that
the ECU interprets as oil pressure. Should this voltage fall
below a certain level, the ECU will shut the generator down
and illuminate the oil pressure LED.
Test the sensor by checking resistance (at rest):
Ohm Value- 240 - 270fl
ENGINE DC CIRCUIT BREAKER
The generator's engine DC circuit is protected by a rocker
type DC 20 amp breaker mounted on the control box (this
also serves as an Emergency Stop Switch). Excessive DC
current draw or DC electrical overload anywhere in the
instrument panel wiring or engine wiring will cause the
breaker to trip to the OFF position. In this event, the DC
power to the ECU will be interrupted, stopping the generator.
No panel LED will illuminate. Check and repair the source
of the problem. After repairing the fault, reset the breaker and
restart the generator.
21
HIGH/LOW RPM SHUTDOWN
The ECU monitors engine speed by the AC voltage produced
by the MPU. Should this voltage reach a preset value, the
ECU will interpret this as an engine overspeed (2175 rpm
approximately) and open the K2 relay, stopping the
generator. The panel Overspeed LED will illuminate. Should
the MPU produce a low AC voltage that the ECU interprets
as an underspeed condition, the ECU will open the K2 relay
and stop the generator. The Overspeed LED will then blink.
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