TP-6805 8/15110 Section 6 Component Testing and Adjustment
6.10 Fault Shutdown Tests
Verify the operation of the generator set overspeed,
overcrank, and low oil pressure shutdowns by
performing the tests in Section 6.10.1. If these tests are
inconclusive, test individual shutdown circuit
components (wiring harness, switch, etc.) as described
in Section 6.10.2.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
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.
6.10.1 Controller Fault Shutdown
Functions
Check the operation of the fault functions programmed
in the controller by performing the following tests. If the
controller does not operate as described, check the
controller settings. Also check the controller wiring and
connections.
Verify that the controller parameters shown in
Figure 6-20 are set correctly for your unit.
Open the generator set output circuit breaker before
beginning the test. (See Figure 1-1 for the circuit
breaker location.)
Parameter Setting
Genset Model Number*
14 kW
20 kW
Genset Serial Number* From nameplate; see Figure 4-7.
Fuel Type[
Natural Gas or
Liquid Propane (LPG)
Phase Connection[ Single Phase
Genset System Voltage[ From nameplate; see Figure 4-7.
Genset System Frequency[ 50 or 60 Hz
* In the Generator Set Information menu.
[ In the Genset System menu.
Fuel Type is available with firmware version 4.5 or higher.
Figure 6-20 Controller Settings
Overspeed Shutdown
Connect a digital voltmeter (DVM) to measure the
output frequency. Start the generator set and manually
adjust the engine speed by moving the throttle linkage.
Note: Be careful not to touch the hot silencer when
reaching in to adjust the throttle linkage.
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. If the overspeed shutdown does not
operate, the generator set should shut down on an
overfrequency fault after approximately 5 seconds.
Low Oil Pressure (LOP) Shutdown
Connect a jumper wire from the LOP switch (lead 13) to
the generator set g round. 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 switch and ground. Start the generator set
and run it for at least 25--3 5 seconds to verify that the
generator set does not shut down.
Overcrank Shutdown
Disconnect the fuel solenoid valve. Press the RUN
button on the controller. Observe that the generator set
cranks for 15 seconds and then rests for 15 seconds.
Check that the generator set shuts down after the third
crank/rest cycle.
Underspeed and Underfrequency Shutdowns
Close the throttle while the generator is running. The
engine speed should decrease until the generator set
shuts down and the controller indicates an Engine
Speed Low Shutdown.
To check the underfrequency shutdown, use very small
movements over a longer period of time to close the
throttle. The genset may need to run at reduced
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