GAC Fusion Series Manuale di avvio rapido - Pagina 8
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13
SYSTEM TROUBLESHOOTING - CONTINUED
UnSaTISfacTorY Performance
SYmPTom
Engine Overspeeds
Actuator does not energize
fully
Engine remains below de-
sired governed speed
InSUffIcIenT maGneTIc SPeeD SIGnaL
A strong magnetic speed sensor signal will eliminate the possibility of missed or extra pulses. The speed control unit will govern well with 1.0 V
RMS speed sensor signal. A speed sensor signal of 3 V AC or greater at governed speed is recommended. Measurement of the signal is made
at Terminals C and D.
The amplitude of the speed sensor signal can be raised by reducing the gap between the speed sensor tip and the engine ring gear. The gap
should not be any smaller than 0.020 in [0.45 mm]. When the engine is stopped, back the speed sensor out by 3/4 turn after touching the ring
gear tooth to achieve a satisfactory air gap.
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 Termi-
nals A(-) & F(+) on the speed control unit.
Measure the voltage at the battery while crank-
ing.
Momentarily connect Terminals A and F. The
actuator should move to the full fuel position.
Measure the actuator output, Terminals A and B,
while running under governor control.
ProBaBLe caUSe of aBnormaL reaDInG
•
After the actuator goes to full fuel, disconnect the speed sensor
at Terminals C and D.
•
If the actuator is still at full fuel-speed then speed control unit is
defective.
•
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:
a. Speed adjustment is set above desired speed
b. Defective speed control unit
If voltage reading is above 1.5 V DC then check for:
a. actuator binding
b. linkage binding
If the voltage reading is below 0.8 V DC:
a. Defective speed control unit
If the voltage is less than:
a. 7 V for a 12 V DC system, or
b. 14 V for a 24 V DC system, Then:
Check or replace battery.
Actuator or battery wiring in error
Actuator or linkage binding
Defective actuator
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
ESD5500-II Fusion Series Speed Control Unit 1-2020-A4
8
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