GAC EEG6550 Series Manuale - Pagina 11

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SYSTEM TROUBLESHOOTING

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 3. Positive (+) and negative (-) refer to meter polarity. Should normal values be indicated during troubleshooting steps, 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 actuators installation manual for testing procedures for that actuator.

STeP

WIreS

normal reaDInG

Battery Supply

F(+) & E(-)

(12 or 24V DC)

1.0V AC RMS min.

C & D

While Cranking

1.0 - 2.0V DC

F(+) & A(-)

While Cranking

InSTaBIlITY

SYmPTom

The engine seems to jitter with

Fast Periodic

a 3Hz or faster irregularity of

speed.

Speed irregularity below 3Hz.

Slow Periodic

(Sometimes severe)

Non-Periodic

Erratic Engine Behavior

UnSaTISfacTorY Performance

SYmPTom

Engine Over Speeds

Over Speed shuts down en-

gine before or after running

speed is reached

Over Speed shuts down

engine before running

speed is reached

DC battery power not connected. Check for blown fuse

Low battery voltage

Voltage

Wiring error

Gap between speed sensor and gear teeth too great

Improper or defective wiring to the speed sensor

Resistance between Terminals D and C should be 130 to 1200 Ω.

Defective speed sensor.

SPEED or IDLE parameter set incorrectly

CRANK or START FUEL set incorrectly

Short/open in actuator wiring

Defective speed control

Defective actuator, see your actuator troubleshooting documentation.

Readjust the GAIN and STABILITY for optimum control.

In extreme cases, change the DEADTIME parameter.

Check fuel system linkage during engine operation for:

a. binding

b. high friction

c. poor linkage

DEADTIME Parameter set too high.

1. Increasing the GAIN should reduce the instability but not totally correct it. If this is the case, there

is most likely a problem with the engine itself. Check for:

a. engine mis-firings

b. an erratic fuel system

c. load changes on the generator set voltage regulator.

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 Terminals A(-)

& F(+) on the speed control unit.

3. Check #TEETH parameter.

Examine the SPEED and OVER

SPEED operating parameters for

the engine

1. Check resistance between Termi-

nals C&D. Should be 130 to 1200

Ω. See specific Magnetic Pick-up

data for resistance.

ProBaBle caUSe of aBnormal reaDInG

If the actuator is at minimum fuel position and there exists an erroneous

speed signal, then check speed sensor.

If the voltage reading is

1.0 to 2.0 V DC:

a. SPEED parameter set above desired speed

b. Defective speed control unit

If voltage reading is > 2.0 V DC then check for:

a. actuator binding

b. linkage binding

If the voltage reading is below 1.0 V DC then defective speed control

unit

Incorrect tooth count entered.

SPEED parameter set too high.

OVER SPEED set too close to SPEED.

Check SPEED RAMP parameter.

Check if VSPD is ON by mistake

Check if AUx is ON by mistake

Actuator or linkage binding.

Speed Control unit defective.

Gain too low.

OVER SPEED set too low

If the speed sensor signal is erroneous, then check the wiring.

EEG6550 Enhanced Electronic Governor 5-2020-A1

PIB1118