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Governors America Corp. © 2021 Copyright All Rights Reserved
ESD5200 Series Speed Control Unit
1-2021-C3
PIB1030
UnSaTISfacTorY Performance
SYmPTom
normaL reaDInG
ProBaBLe caUSe
Engine Overspeeds
1.
Do Not Crank. Apply DC power to
the governor system.
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.
2.
Manually hold the engine at the
desired running speed. Measure
the DC voltage between Terminals
A(-) & F(+) on the speed control
unit.
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
Overspeed Shuts Down En-
gine After Running Speed is
Reached
•
Speed adjustment set too high.
•
OVERSPEED set to close to running speed.
•
Actuator or linkage binding.
•
Speed control unit defective.
Overspeed Shuts Down En-
gine Before Running Speed
is Reached
Check impedance between
Terminals C & D. Should be 160
to 1200 Ω
OVERSPEED set too low. Adjust 5-6 turns CW.
Erroneous speed sensor signal. Check wiring.
Actuator does not energize
fully
1.
Measure the voltage at the battery
while cranking.
Replace the battery if weak or undersized
2.
Momentarily connect Terminals A
and F. The actuator should move
to the full fuel position.
•
Actuator or battery wiring in error
•
Actuator or linkage binding
•
Defective actuator
•
Fuse opens. Check for short in actuator or harness.
Engine remains below
desired governed speed
1.
Measure the actuator output, Ter-
minals A & B, while running under
governor control.
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
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SYSTEM TROUBlESHOOTINg (CONTINUED)
InSTaBILITY
InSTaBILITY
SYmPTom
ProBaBLe caUSe
Fast Periodic
The engine seems
to jitter with a 3Hz
or faster irregularity
of 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
Slow Periodic An irregularity
of speed below
3Hz. (Sometimes
severe)
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.
Non-Periodic
Erratic Engine
Behavior
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.
DROOP
IDLE
E2 E3
DEAD TIME
COMPENSATION POSTS
