MULTIQUIP DCA Series - ECU 9988 N Potentiometer Adjustments

GENERATOR SERVICE AND TROUBLESHOOTING MANUAL — REV. #0 (08/29/23) — PAGE 53
Figure 56. Potentiometer Adjustments
SMALL
FLAT-BLADE
SCREWDRIVER
ECU 9988N
C
E
ENGINE CRANK
DISCONNECT
FAULT DELAY
OIL PRESS./TEMP.
ENGINE
OVERSPEED
ADJUSTMENT
POTENTIOMETERS
DIP
SWITCHES
B
ENGINE CRANK
TIME
F
A
ON
1
2
3
4
5
D
ADJUSTING ENGINE CRANK DISCONNECT
This is an adjustment for the engine starter (crank duration).
Using a small, at-blade screwdriver (Figure 56A), turn
the engine crank disconnect adjustment potentiometer
(Figure 56B) 30 turns counterclockwise. Then turn it about
3 turns clockwise.
Try to start the engine. The starter should crank but
disengage quickly. If the engine starts, the ECU engine
running lamp should be lit. Once veried, shutdown the
engine.
With the engine shutdown, adjust the the engine crank
disconnect adjustment potentiometer 1 turn clockwise
and try restarting the engine. Continue performing this
adjustment of the potentiometer, in a clockwise direction
until the engine starts reliably. If the overcrank and
overspeed LEDs light at the same time on your unit,
reference troubleshooting ow charts in this service
manual for additional information.
ADJUSTING ENGINE OVERSPEED
This adjustment is for engine overspeed as a safety
measure.
Turn the engine overspeed adjustment potentiometer
(Figure 56C) 30 turns clockwise. Using a small, at-blade
screwdriver, set the DIP switch at position 5 (Figure 56D)
to the ON position (up).
Start the engine. It should crank and start. Verify that the
engine running LED is lit. Now start turning the overspeed
adjustment potentiometer counterclockwise until the engine
control shuts down the engine (overspeed fault). Again
using a small, at-blade screwdriver, set the DIP switch at
position 5 to the OFF position (down).
If the overcrank and overspeed LEDs light at the same
time on the ECU, reference troubleshooting ow charts
in this service manual for additional information.
NOTICE
Be sure you have adjusted the engine crank disconnect
potentiometer rst..
ECU 9988N