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Governors America Corp. © 2020 Copyright All Rights Reserved
EEG6550 Enhanced Electronic Governor
5-2020-A1
PIB1118
STeP
WIreS
normal reaDInG
ProBaBle caUSe of aBnormal reaDInG
1
F(+) & E(-)
Battery Supply
Voltage
(12 or 24V DC)
1.
2.
3.
DC battery power not connected. Check for blown fuse
Low battery voltage
Wiring error
2
C & D
1.0V AC RMS min.
While Cranking
1.
2.
3.
4.
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.
3
F(+) & A(-)
1.0 - 2.0V DC
While Cranking
1.
2.
3.
4.
5.
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.
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.
SYSTEM TROUBLESHOOTING
14
InSTaBIlITY
SYmPTom
ProBaBle caUSe of aBnormal reaDInG
Fast Periodic
The engine seems to jitter with
a 3Hz or faster irregularity of
speed.
1.
2.
Readjust the GAIN and STABILITY for optimum control.
In extreme cases, change the
DEADTIME parameter.
Slow Periodic
Speed irregularity below 3Hz.
(Sometimes severe)
1.
2.
Check fuel system linkage during engine operation for:
a. binding
b. high friction
c. poor linkage
DEADTIME Parameter set too high.
Non-Periodic
Erratic Engine Behavior
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.
SYSTem InoPeraTIve
InSTaBIlITY
UnSaTISfacTorY Performance
SYmPTom
normal reaDInG
ProBaBle caUSe of aBnormal reaDInG
Engine Over Speeds
1. Do Not Crank. Apply DC power to
the governor system.
1.
If the actuator is at minimum fuel position and there exists an erroneous
speed signal, then check speed sensor.
2. Manually hold the engine at the
desired running speed. Measure the
DC voltage between Terminals A(-)
& F(+) on the speed control unit.
1.
2.
3.
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
3.
Check #TEETH parameter.
1. Incorrect tooth count entered.
Over Speed shuts down en-
gine before or after running
speed is reached
1.
Examine the SPEED and OVER
SPEED operating parameters for
the engine
1.
2.
3.
4.
5.
6.
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 shuts down
engine before running
speed is reached
1. Check resistance between Termi-
nals C&D. Should be 130 to 1200
Ω. See specific Magnetic Pick-up
data for resistance.
1.
2.
OVER SPEED set too low
If the speed sensor signal is erroneous, then check the wiring.
SYSTEM TROUBLESHOOTING
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