GAC ESD-5550 Series Manual - Página 8

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GAC ESD-5550 Series Manual
7
SySTEM TROUblESHOOTINg (CONTINUED)
UnSaTISfacTorY Performance
SYmPTom
Engine Overspeeds
1.
2.
Overspeed Shuts Down En-
gine After Running Speed is
Reached
Overspeed Shuts Down En-
gine Before Running Speed
is Reached
Actuator does not energize
1.
fully
2.
Engine remains below
1.
desired governed speed
normaL reaDInG
Do Not Crank. Apply DC power to
the governor system.
Manually hold the engine at the
desired running speed. Measure
the DC voltage between Terminals
A(-) & F(+) on the speed control
unit.
Check impedance between
Terminals C & D. Should be 160
to 1200 Ω
Measure the voltage at the battery
while cranking.
Momentarily connect Terminals A
and F. The actuator should move
to the full fuel position.
Measure the actuator output, Ter-
minals A & B, while running under
governor control.
ProBaBLe caUSe
After the actuator goes to full fuel, disconnect the speed sensor at Terminal
C & D. If the actuator is still at full fuel-speed then the speed control unit is
defective.
1.
If the voltage reading is 1.0 to 2.0 V DC:
•
SPEED adjustment is set above desired speed
•
Defective speed control unit
2.
If voltage reading is above 2.0 V DC then check for:
•
actuator binding
•
linkage binding
3.
If the voltage reading is below 1.0 V DC it may be a defective speed
control unit
4.
Check if Gain is set too low.
•
Speed adjustment set too high.
•
OVERSPEED set to close to running speed.
•
Actuator or linkage binding.
•
Speed control unit defective.
OVERSPEED set too low. Adjust 5-6 turns CW.
Erroneous speed sensor signal. Check wiring.
If voltage for a 12 V DC system is less than 7 V DC, or for a 24 V DC system is
less than 14 V DC, replace the battery if weak or undersized
•
Actuator or battery wiring in error
•
Actuator or linkage binding
•
Defective actuator
•
Fuse opens. Check for short in actuator or harness.
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.
SPEED parameter set too low
8
ESD5550-5570 Series Speed Control Unit 1-2021-E1 PIB1003
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