GAC ESD5522E Handmatig - Pagina 9

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GAC ESD5522E Handmatig
12
TROUBlEShOOTINg (CONTINUED)
unSatISfactorY Performance
SYmPtom
cHecK
1.
Do Not Crank. Apply DC
power to the governor
Engine
Manually hold the engine
Overspeed
at the desired running
speed. Measure the DC
2.
voltage between Termi-
nals A(-) & F(+) on the
speed control unit.
Measure the voltage at
1.
the battery while cranking.
Momentarily connect
Actuator does not
Terminals A and F. The
2.
energize fully
actuator should move to
the full fuel position.
Measure frequency of
3.
magnetic speed pickup
Measure the actuator
Engine remains
output, Terminals A &
below desired
1.
B, while running under
governed speed
governor control.
1.
After the actuator goes to full fuel, disconnect the speed sensor at Terminal C and D. If the actuator
is still at full fuel-speed then the speed control unit is defective.
system.
2.
If the actuator is at minimum fuel position and there exists an erroneous position signal, then check
speed sensor cable.
If the voltage reading is 1.0 to 1.5 V DC:
•
SPEED adjustment is set above desired speed
•
Defective speed control unit
If voltage reading is above 1.5 V DC then check for:
•
actuator binding
•
linkage binding
If the voltage reading is below 0.8 V DC:
•
Defective speed control unit
If the voltage is less than:
•
7V for a 12V system, or
•
14V for a 24V system, Then: Check or replace battery.
1.
Actuator or battery wiring in error
2.
Actuator or linkage binding
3.
Defective actuator
If above 7000 Hz then add jumper to Terminal G and J.
(or calculate).
1.
If voltage measurement is within 2 V DC of the battery supply voltage level, then fuel control is
restricted from reaching full fuel position, possibly due to mechanical governor, carburetor spring, or
linkage interference.
2.
SPEED parameter set too low
ProBaBLe cauSe
9
ESD5500E Series Speed Control Unit 2-2021-F2 PIB1002
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