TP-5737 5/01 41Section 5 Decision-Makert 3+ Troubleshooting
8. Simulate engine malfunctions by pressing
FASTCHECK
â
fault switches. The corresponding
fault lamp on the controller should light during each
simulated engine malfunction.
Note: Leave the FASTCHECK
â
engine switch in
the RUN position for at least 30 seconds
before pushing toggle switches. Toggle the
generator set master switch to the
OFF/RESET position and the
FASTCHECK
â
engine switch to the OFF
position, then back to the RUN position after
simulated fault shutdowns.
5.4.4 Overcrank
Use the following procedure to test the controller’s
ability to detect a locked engine and to stop a startup
attempt if the starter locks or does not engage.
Overcrank Circuitry Test Procedure
1. Move the FASTCHECK
â
engine switch to the OFF
position.
2. Move the generator set master switch to the OFF
position and then move the switch to the RUN
position.
3. IGN, CRK, and REG lamps on FASTCHECK
â
should light for approximately 5 seconds and then
go out. Five seconds later, the IGN, CRK, and REG
lamps should relight for 5 seconds before going out
again (15 seconds total elapsed time). The
controller OVERCRANK lamp lights. Check for
operating voltage between TB1-42A (+) and
TB1-12 (--).
4. This test verifies the proper operation of the engine
overcrank circuit. If the OVERCRANK shutdown
fails to function, check the speed sensor and
related circuitry. See Section 5.4.5, Controller
Speed Sensor Circuitry, and Section 7.10, Speed
Sensor Test.
5.4.5 Controller Speed Sensor Circuitry
To check the controller’s ability to respond to signals
from the speed sensor, perform the following test:
Speed Sensor Circuitry Test Procedure
1. Move the generator set master switch to the
OFF/RESET position.
2. Move the FASTCHECK
â
engine switch to the OFF
position.
3. Move the generator set master switch to the RUN
position. Observe the IGN, CRK, and REG lamps
light.
4. Within 5 seconds, move the FASTCHECK
â
engine
switch to the RUN position.
5. If the FASTCHECK
â
CRK lamp goes out, the
controller speed sensor circuitry is functioning
correctly.
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