GAC ESD5528 Snelstarthandleiding - Pagina 8

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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

PIB2180