TP-6774 2/14a 87Section 8 Component Testing and Adjustment
8.14 Fault Shutdown Tests
Verify the operation of the generator set overspeed,
overcrank, high engine temperature, and low oil
pressure shutdowns by performing the following tests. If
these tests are inconclusive, test individual shutdown
circuit components (wiring harness, switch, etc.) as
described elsewhere in this section.
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.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
WARNING
Servicing the exhaust system. Hot parts can cause
severe injury or death. Do not touch hot engine parts. The
engine and exhaust system components become extremely
hot during operation.
8.14.1 Controller Fault Shutdown
Functions
Check the operation of the fault functions programmed in
the ADC IId by performing the following tests. If the
ADC IId does not operate as described, check the
ADC IId configuration settings; see Section 7.13. Also
check the ADC IId wiring and connections; see
Section 10.
Overspeed Shutdown
The overspeed setting is programmed into the ADC IId
controller and is not adjustable. Verify that the following
controller configuration is set correctly for your unit.
Open the generator set output circuit breaker before
beginning the test. (See 1, Service Views for the circuit
breaker location.)
Connect a DVM to measure the output frequency. Start
the generator set and manually adjust the engine speed.
See Section 4.4.
Increase the engine speed to at least 115% of the rated
engine speed, 69 Hz on 60 Hz models or 58 Hz on 50 Hz
models. Verify that the generator set shuts down on an
overspeed fault (Eng Speed High Shutdwn). If the
overspeed shutdown does not operate, the generator
set should shut down on an overfrequency fault
(Frequency High Shutdwn) after approximately
5 seconds.
Low Oil Pressure (LOP) Shutdown
Connect a jumper wire from the LOP sender (lead 7) to
the generator set ground. Start the generator set. Verify
that the generator set shuts down after approximately
25--35 seconds of operation. Remove the jumper wire
from the LOP sender and ground. Start the generator
set and run it for at least 25--35 seconds to verify that the
generator set does not shut down.
Overcrank Shutdown
Disconnect the fuel supply line. Press the power button
to turn the controller on. Press the start/stop button to
start the generator set. Observe that the generator set
simulates cranking for 15 seconds and then rests for
15 seconds. Check that the generator set shuts down
after the third crank/rest cycle.
High Engine Temperature Shutdown
Connect a jumper wire across coolant temperature
sensor (CTS) connections P8-1 and P8-2. Start the
generator set. Verify that the generator set shuts down
approximately 5 seconds after the generator set comes
up to speed. Remove the jumper wire. Start the
generator set and run it for at least 30 seconds to verify
that the generator set does not shut down.
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