GAC ESD5200 Series Handbuch - Seite 7

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GAC ESD5200 Series Handbuch
10
SYSTEM TROUBlESHOOTINg (CONTINUED)
InSTaBILITY
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
UnSaTISfacTorY Performance
SYmPTom
Engine Overspeeds
1.
2.
Overspeed Shuts Down En-
gine After Running Speed is
Reached
Overspeed Shuts Down En-
gine Before Running Speed
is Reached
Actuator does not energize
1.
fully
2.
Engine remains below
1.
desired governed speed
1.
Readjust the GAIN and STABILITY for optimum control.
2.
Turn off other electrical equipment that may be causing interference.
3.
Make sure LEAD switch SW1 is set to OFF
4.
If system is still unstable, set DTC switch SW2 to OFF
Readjust the GAIN and STABILITY
5.
Set DIP switches 1 and 2 to ON in the following order: First SW1, Second SW2,
and Third SW1 & SW2.
6.
Check fuel system linkage during engine operation for:
•
binding
•
high friction
•
poor linkage
7.
Adjust DEAD TIME COMPENSATION by adding a capacitor from posts E2 to
E3 (negative on E2). Start with 10 mF and increase until instability is eliminated.
1.
Increasing the GAIN should reduce the instability but not totally correct it.
2.
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.
3.
If throttle is slightly erratic, but performance is fast, then move switch SW1 to the OFF position.
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 Terminals
A(-) & F(+) on the speed control
unit.
Check impedance between
Terminals C & D. Should be 160
to 1200 Ω
Measure the voltage at the battery
while cranking.
Momentarily connect Terminals A
and F. The actuator should move
to the full fuel position.
Measure the actuator output, Ter-
minals A & B, while running under
governor control.

ProBaBLe caUSe

ProBaBLe caUSe
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 voltage reading is
1.0 to 2.0 V DC:
•
SPEED adjustment is set above desired speed
•
Defective speed control unit
If voltage reading is above 2.0 V DC then check for:
•
actuator binding
•
linkage binding
If the voltage reading is below 1.0 V DC it may be a defective speed control
unit
•
Speed adjustment set too high.
•
OVERSPEED set to close to running speed.
•
Actuator or linkage binding.
•
Speed control unit defective.
OVERSPEED set too low. Adjust 5-6 turns CW.
Erroneous speed sensor signal. Check wiring.
Replace the battery if weak or undersized
•
Actuator or battery wiring in error
•
Actuator or linkage binding
•
Defective actuator
•
Fuse opens. Check for short in actuator or harness.
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
7
ESD5200 Series Speed Control Unit 1-2021-C3 PIB1030
Governors America Corp. © 2021 Copyright All Rights Reserved
DEAD TIME
COMPENSATION POSTS
E2 E3
DROOP
IDLE