GAC ESD2244 Quick Start Manual - Page 3

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GAC ESD2244 Quick Start Manual
6
SYSTEM TROUBLESHOOTING
If the engine governing system does not function, the fault may be determined by performing the voltage tests described in Steps 1 through 4. Positive (+) and nega-
tive (-) refer to meter polarity. Should normal values be indicated during troubleshooting steps, and then the fault may be with the actuator or the wiring to the actuator.
Tests are performed with battery power on and the engine off, except where noted. See actuator publication for testing procedure on the actuator.
STEP
WIRES
1
E(+) & F(-)
0-3.9 with speed trim. 7.1-7.9 with-
2
A(+) & B(-)
3
C(+) & D(-)
1.0 VAC minimum while cranking
4
H(-) & E(+)
SYMPTOM
Engine Overspeeds
Actuator does not energize
fully
Engine remains below de-
sired governed speed
NORMAL READING
Battery Supply
Voltage
(12, 24, or 32 VDC)
out speed trim.
0.8-1.5 V while cranking
If unsuccessful in solving issue, contact GAC for assistance.
[email protected] or call: 1-413-233-1888
UNSATISFACTORY PERFORMANCE
NORMAL READING
1. Do Not Crank. Apply DC power to the governor
system.
2. Manually hold the engine at the desired running
speed. Measure the DC voltage between Termi-
nals H(-) & E(+) on the speed control unit.
1. Measure voltage between Terminals H(-) & E(+)
on the speed control unit. Should be 0.8 to 1.5
volts.
2. Momentarily connect Terminals E to H. The
actuator should move to the full fuel position.
1. Measure the actuator output, Terminals G & H,
while running under governor control.
SYSTEM INOPERATIVE
1.
DC battery power not connected. Check for blown fuse.
2.
Low battery voltage
3.
Wiring error
1.
Speed trim shorted or miswired.
Defective unit.
2.
1.
Gap between speed sensor and gear teeth too great.
Improper or defective wiring to the speed sensor. Resistance should be between 30 to 1200
2.
ohms.
3.
Defective speed sensor.
1.
Wiring error to actuator.
2.
Defective speed control unit.
3.
Defective actuator.
1.
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.
If the actuator is at minimum fuel position and there exists an
erroneous position signal, then check speed sensor cable.
2.
1.
If the voltage reading is
1.0 to 1.5 VDC:
a. SPEED adjustment is set
b. Defective speed control unit
2.
If voltage reading is above 1.5 VDC then check for:
a. actuator binding
b. linkage binding
Set point of overspeed shutdown set too low.
3.
If the voltage reading is
below 0.8 VDC:
4.
a. Defective speed control unit
1.
Replace the battery if weak or undersized.
Actuator wiring incorrect.
2.
If the voltage is less than 1.5V:
3.
a. SPEED set too low.
1.
Actuator or battery wiring in error
2.
Actuator or linkage binding
3.
Defective actuator
1.
If voltage measurement is within
1.5 VDC 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.
If not, increase speed setting.
2.
ESD2100 Electronic Speed Control Unit 10.14.16
3
PROBABLE CAUSE OF
ABNORMAL READING
PROBABLE CAUSE OF
ABNORMAL READING
above desired speed
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