76 Section 5 Component Testing and Adjustment TP-6844 1/13
5.7 Fault Shutdown Tests
Verify the operation of the generator set overspeed,
overcrank, 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.
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.
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.
5.7.1 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 5-18 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.)
Figure 5-18
Figure 5-18 Controller Settings
Overspeed Shutdown
Connect a digital voltmeter (DVM) to measure the AC
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
engine run speed, typically 3350 rpm. Verify that the
generator set shuts down on an overspeed fault. If the
overspeed shutdown limit is not reached quickly
enough the generator set should shut down on an
overvoltage fault after approximately 2 seconds.
Lower Oil Pressure (LOP) Shutdown
Connect a jumper wire from the LOP switch (lead 13)
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 switch 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 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 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.
Hazardous voltage. Moving parts.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set
until it cools.
Parameter Setting
Genset Model Number*
* In the Generator Set Information menu.
6VSG
Genset Serial Number* From nameplate
Fuel Type†
† In the Genset System menu.
Natural Gas or Liquid
Propane Gas (LPG)
Genset System Voltage† From nameplate; see
Figure 3-5
To Next Page
Loading...
Need help?
General
