Kutai electronics GCU-20 User Manual
GCU-20
Automatic Engine Control Unit
WARNING
Disconnect all electric power to the machine before
installation.
Protection Functions
Engine fail to start
Engine tries 3 times to start
Engine Low Oil Pressure Protection
Shutdown activated after 3 seconds
Oil Pressure Switch Type NO or NC
Auxiliary Shutdown
Shutdown activated after 3 seconds delay by NO contact
Engine High Water temperature Protection
Shutdown activated after 3 seconds delay by NO contact
Engine Over-speed Protection
Shutdown activated after 3 seconds
50 Hz activated at 55 Hz – 60 Hz activated at 66 Hz
Engine Under-Speed Protection
Shutdown activated after 5 seconds
50 Hz activated at 45 Hz – 60 Hz activated at 54 Hz
No Speed Signal Present Protection
Shutdown activated after 5 seconds (MPU use only)
Icon Reference Table
ICON
DESCRIPTION
ACTION
Low Oil Pressure Alarm
Auxiliary Alarm (Flashing)
Shutdown
High Water Temperature Alarm
Shutdown
Over Crank Alarm
Shutdown
Wrong speed Alarm
No Speed Signal Alarm (Flashing)
Shutdown
Engine Running Indicator
Engine IDLE Indicator (Flashing)
Engine Pre-Heat Indicator
Pre-Heat
Physical Dimensions
Mounting Pattern
Installing Panel
Auxiliary Alarm (Flash)
Pre-Heat
Wrong Speed
Engine IDLE (Flash)
Engine Running
No Speed Signal (Flash)
Over Cranking
High Temp.
Low Oil Pressure
Model GCU-20
A
B
D
C
E
MPU Indicator
Speed Sensor
Connector
MPU indicator
in Green
60
Potentiometers & DIP Switches Detail
Adjustments
On the back of the GCU-20 we have five adjustment pots that
modify time delay functions.
●
A Engine Pre-Heat
Adjustable from 2 to 30 sec
●
B Energized to STOP
Adjustable from 1 to 15 sec
●
C Engine Cool-down
Adjustable from 0 to 300 sec
●
D Starter Cranking time
Adjustable from 1 to 15 sec
●
E Engine Idle (Governor)
Adjustable from 0 to 300 sec
Function Setting
Also In the back, the GCU-20 we have six dip / switches that
set specific working parameters.
SW 1 Oil Pressure Switch Used for Crank Disconnect
ON - Disable OFF - Enable
SW 2 Oil Pressure Switch Type
ON - Normal Open OFF - Normally Close
SW 3 Engine Stop Setting
ON - Energize to Start OFF - Energize to STOP
SW 4 Generator Frequency (Ignore if it is a Water Pump)
ON – 50 Hz OFF – 60 Hz
SW 5 MPU Setting
ON - Enable (used to Program Speed)
OFF - Disable
SW 6 Speed Signal Type
ON - Use MPU for speed sensing
OFF - Use AC generator frequency for speed sensing
Lamp Test Function
Applying battery (+) signal to terminal 1 (Lamp Test Terminal)
the GCU-20 turns on all the front panel LEDs and
annunciator lamps.
+
Battery
10A
Model GCU-20
No Speed Signal (Flash)
Engine Running
Engine IDLE (Flash)
Pre-Heat
Wrong Speed
J1 J2 J4J3
Lamp Test
Low Oil Pressure
High Temp.
Over Cranking
Auxiliary Alarm (Flash)
Remote Annunciator
J7J6J5
Using with MPU
If you use the MPU for speed sensing instead of the
generator frequency you must set (Switch 6 to ON), and
depending on flywheel size (different generators has a
different MPU frequencies). This nominal frequency MUST
be set FIRST.
It is easy, if you follow the procedure below.
Step 1：Move Switches 5 & 6 to “ON” before starting engine.
Step 2：Start engine, by moving
panel switch to “TEST”
(Manual Start)
Step 3 ： Run the engine
normally at its rated
speed. (60 or 50 Hz)
or pump rated RPM
Step 4：Now quickly move
Switch 5 to “OFF”
Step 5：When MPU LED turns
GREEN setup is
complete.
MPU Setup failure
If setup fails, the control module
shuts down the engine and
immediately flashes ON all the
LEDs on the front panel.
Check MPU and wiring before
repeating this setup again.
WARNING
If the MPU signal is used for speed sensing (Switch 6
ON), but MPU frequency set up has not yet been
completed the MPU indicator will flash RED and the
engine will not run under any condition.
However, if the user tries to start the engine a “No
Speed Signal” warning LED will continue to flash
indicating that the user should repeat the set up of the
MPU frequency setting or switch to generator
frequency sensing.
Select Switch
Start
Remote
OFF
Auto
Test
Batt(-)
Select Switch
Remote
Batt(-)
Start
OFF
Test
Auto
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