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8
EG3002F
Fault Description
Possible Cause
Inspection (Fault Clearing) Actions
7.2 Low
engine
speed
1. Incorrect setting of
Frequency Range
SW
1. Refer to the
“Settings” section in this manual.
2. Engine remains in
IDLE mode
2. Check whether Terminals 2 & 3 are shorted.
3. Caused by remote
speed signal input
3. If any of Terminals 6, 7, 8, or 9 are in use, then first disconnect
all wires and test again. If engine speed returns to normal this
means there is a problem with remote speed signal input.
4. Problem with MPU
signal
4. Check whether MPU is disconnected (Must be directly
connected to Terminals 10 & 11. Resistance of 10
1,
000Ω is
normal.
Check that MPU has been connected with shielded wire
grounded at one end. Repair wiring as required.
7.3 High
engine
speed
1. Incorrect setting of
Frequency Range
SW
1. Refer to the
“Settings” section in this manual.
2. Caused by remote
speed signal input
2. If any of Terminals 6, 7, 8, or 9 are in use, then first disconnect
all wires and test again. If engine speed returns to normal this
means there is a problem with remote speed signal input.
3. Problem with MPU
signal
3. Check whether MPU is disconnected (Must be directly
connected to Terminals 10 & 11. Resistance of 10
1,
000Ω is
normal.
Check that MPU has been connected with shielded wire
grounded at one end. Repair wiring as required.
4. Controller defective 4. With engine OFF apply power to the controller, if actuator
linkage moves or if there is a voltage output on Terminals 4 & 5
this indicates the controller is defective.
7.4 Engine speed will
not
stabilize
(Steady
oscillations)
1. Incorrect
adjustments
or
settings
1. Refer to the
“Settings” section in this manual.
2. Incorrect
installation
of
actuator linkage
2. Too much mechanical gain from actuator linkage. Adjust or
change the linkage to reduce mechanical gain.
7.5 Engine speed will
not
stabilize
(irregular
oscillations)
1. Problem
with
linkage
1. With the engine OFF toggle the actuator linkage back and
forth. The movement should be smooth with no gap in the
linkage connection to the actuator or rust causing resistance. If
there is a gap it will make it difficult to achieve stable settings.
MPU signal is picking up interference. It is recommended to
use shielded cable with one end grounded, or shorten the
wiring connecting the MPU.
※
Appearance and specifications of products are subject to change for improvement without prior notice.
※
NOTE : The shielded cable of the magnetic pick-up (MPU) cannot be spliced or it will allow electromagnetic
interference to the controller.
