GAC ESD5550M Manual - Página 7

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SySTEM TROUblESHOOTINg

InSUffIcIenT maGneTIc SPeeD SIGnaL

A strong magnetic speed sensor signal eliminates the possibility of missed or extra pulses. The speed control unit governs well with 0.5

volts RMS speed sensor signal.

A speed sensor signal of 3 volts RMS 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 0.02 in [0.5 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.

SYSTem InoPeraTIve

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 negative (-) 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 your actuator publication for troubleshooting testing.

STeP

WIreS

cHecK

F(+) & E(-)

Battery Supply

Voltage

(12 or 24 V DC)

C(+) & D(-)

1.0 V AC RMS

minimum while

cranking

P(+) & G(-)

10 V DC, Internal

Supply

F(+) & A(-)

1.0 - 2.0 V DC while

cranking

InSTaBILITY

SYmPTom

Fast Periodic

The engine seems

to jitter with a 3Hz

or faster irregularity

of speed.

Slow Periodic

An irregularity

of speed below

3Hz. (Sometimes

severe)

Non-Periodic

Erratic Engine

Behavior

DC battery power not connected. Check for blown fuse.

Low battery voltage

Wiring error

Gap between speed sensor and gear teeth too great. Check Gap.

Improper or defective wiring to the speed sensor. Resistance between D and C should be 160 to

1200 Ω. See specific mag pickup data for resistance.

Defective speed sensor.

Short on Terminal P.

Defective speed control unit.

SPEED parameter set too low

Short/open in actuator wiring

Defective speed control

Defective actuator, see your actuator's Troubleshooting guide.

Readjust the GAIN and STABILITy for optimum control.

Turn off any local electrical equipment that may be causing EMI interference.

Set the Lead Circuit DIP switch SW1 to OFF

If system is still unstable, set Soft Coupling SW2 to ON. This may indicate soft or worn couplings in drive

train.

Remove E1 to E2 jumper. See section 4, Wiring diagram.

Readjust GAIN and STABILITy

Set Lead Circuit and Soft Coupling DIP switches SW1 and SW2 to ON in the following order: First SW1,

Second SW2, and Third SW1 & SW2.

Check fuel system linkage during engine operation for:

•

binding

•

high friction

•

poor linkage

Adjust DEAD TIME COMPENSATION by adding a capacitor from posts E1 to E2. See section 4, Wiring

diagram. Start with 10 mF and increase until instability is eliminated.

Add small amount of droop (jumper K and L). See section 4, Wiring diagram.

If increasing GAIN does not reduce the instability but not totally correct it issue may be with engine.

If this is the case, there is most likely a problem with the engine itself. Check for:

•

engine mis-firings

•

an erratic fuel system

•

load changes on the generator set voltage regulator.

If throttle is slightly erratic, but performance is fast, move SW1 to the OFF position.

ProBaBLe caUSe

ProBaBLe SoLUTIon

ESD5550-5570 Series Speed Control Unit 1-2021-E1 PIB1003