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GCU - MP3 Manual
13. Signal and Marks
 GCU : GENERATOR CONTROL UNIT
 ETS : Supplying power to solenoid when
stopped
 ETR : Supplying power to solenoid when in
operation
 86X : Breakdown indicating relay
 6X
: Operation indicating relay
 23X : Preheating relay
 52G : ACB
 SM
: Starting motor
 PS
: Pinion solenoid
 88
: Start assistant magnet
 IDLE SPEED : Lowest speed of engine
without the assistance of engine starting
motor
14. Cause of Breakdown and Solutions
Symptom
When there is no
power(Control power lamp
is not on)
Cannot start(starter motor
is not working)
When cannot start(starter
motor is working)
When cannot start(stops
soon after the start)
RPM meter is not working
while generator is in
operation
No automatic operation of
generator upon commercial
power outage
Cause
DC circuit breaker is open
DC fuse is disconnected
Wrong wiring
Flat battery
Flat battery
Breakdown of start-assistant
magnet
Breakdown of starter motor
Wrong or no wiring
Breakdown of preheating plug
Wrong DIP S/W setting
Wrong or no OPG wiring
Wrong or no wiring of
PICK-UP
Wrong or no wiring in
generator voltage GS1 or GS2
Wrong DIP S/W setup for
detecting genera
색
speed
No connection of DC- into
CNT socket
 MPU : MAGNETIC PICKUP
 RPM : Rotating speed indicator
 5S
: Stop solenoid
 88X : Start output relay
 EPB : Emergency stop button
 OPS : Oil pressure switch
 WTS : Coolant temperature switch
 RPM : Revolution speed meter
 63Q : Oil pressure switch
 26W : Coolant temperature switch, relay
 48X : Start failure relay
 62X : Operation relay
 14X : IDLE SPEED relay
Close DC circuit breaker
Replace fuse with the same capacity
Correct wiring referring to the circuit
diagram
Recharge battery at least 5 hours
Recharge battery at least 5 hours
Replace start-assistant magnet
Replace starter motor
Correct wiring by referring to the circuit
diagram
Replace preheating plug
Correctly select ETR and ETS by inquiring
the manufacturer of the engine
Correct wiring by referring to the circuit
diagram
Correct wiring by referring to the circuit
diagram
Correct wiring by referring to the circuit
diagram
If used MPU for detecting generator
speed set to OFF, or set to ON if used
generator voltage.
Connect DC- into CNT socket
EGCON CO., LTD
Solution