GU304A Controller Operation Manual
Contents
1. Description ········································································································ 2
2. The Outline Dimensional Drawings and wirings of Controller ································· 2
3. Operation Panel ································································································ 4
4. Installation Guide······························································································ 6
5. Control and Operation Instruction··································································· 6
6. Measure and Display Data················································································ 7
7. Warning and Shutdown Alarm ········································································· 7
8. Parameters Setting and Menu System ···························································· 9
9. Preparation before Start the Controller························································· 12
10. Technical Parameters ····················································································· 12
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GU304A Controller Operation Manual
1. Description
GU304A is an engine safety module, which is used for engine safety protection,
displaying running status and parameters. The module measures and displays multi-
parameters for engine, if warning occurs during engine running, LED on panel will
display related warning; if failure occurs, LED on panel will display related failure,
module will closes fuel and outputs failure signal at the same time, engine stops. Its
main characteristics are as following:
z Adopts MPU as core.
z The protective parameters can be configured neatly by panel buttons and LED.
z Measure and display parameters for engine, such as battery voltage, oil
pressure, coolant temperature, rpm and running hours.
z The fuel mode of engine can be set via procedure.
z Inset kinds of P/T sensor for user’s choice.
z The controller adopts DIN72 standard enclosure, all connections are connected
by pin-like and locked up terminals, easier and more convenient to install,
connect, move and replace the device.
This manual is only suitable for GU304A engine controller, user must carefully
read this manual first.
2. The Outline Dimensional Drawings and wirings of Controller
2.1 Following Details:
Operation Panel W72mm×H72mm
Install Hatch W67mm×H67mm
Thickness D68.5mm (unconnected)
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GU304A Controller Operation Manual
2.2 Connecting Terminals:
Pin No. Function Description Signal Dim
1 Frequency measure input 50-300VAC (5-70Hz) 1mm²
2 Frequency com. port 2 core
shield
3 Magnetic sensor signal {+} 1-70VAC (1-10KHz) line
4 Auxiliary output +B output, 3A/30VDC 1mm²
5 Alarm (Failure) output +B output, 3A/30VDC 1mm²
6 Fuel output +B output, 3A/30VDC 1mm²
7 Working power {+} 12V/24V 1mm²
8 Working power {-} (8-32VDC continued) 1mm²
9 Low oil pressure signal low potential is active 1mm²
10 High temperature signal low potential is active 1mm²
11 Low fuel level signal low potential is active 1mm²
12 High canopy temperature signal low potential is active 1mm²
13 E-stop signal low potential is active 1mm²
14 Half fuel level signal low potential is active 1mm²
15 Oil pressure detect resistance sensor (<2KΩ) 1mm²
16 Coolant temperature detect resistance sensor (<2KΩ) 1mm²
NOTE: either frequency measure or speed detect can be selected, do not used
simultaneously, connect the common port to Pin No. 2.
2.3 Typical Wiring Diagram:
GU304A
CAN/TEMP. SWITCH
PRESS. SWITCH
TEMP. SWITCH
HALF FUEL
LOW FUEL
DC SUPPLY
E.STOP
（12V/24V）
8 7 6 5 4 2 3 1 9 10 11 12 13 14 15 16
- + FUEL ALARM AUX
F
PICKUP
P-sensor
T-sensor
N U
DCV
G
~
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GU304A Controller Operation Manual
3. Operation Panel
The whole operation panel includes 3 sections: 4-digit LED, LED indicator and
operation buttons.
3.1 LED Displays and the control buttons:
A row of LED on the top of panel respectively display battery voltage (DCV), oil
pressure (Kpa), coolant temp (℃), running speed (RPM) and running hours (HR).
The subjacent 2 rows of LED respectively display each working status. LED displays
each measuring parameter and system menu, and combined with control buttons
which provides a friendly operation interface for operator.
Buttons Function Description:
Function Description Tag
Enter into submenu / modify / confirm modification
Scroll up menu / value ascend when continuously press
Scroll down menu / value descend when continuously press
3.2 The Descriptions of LED Status:
When safety-on delay counting is over, if module detects that data of oil pressure
and coolant temp is normal and no failure shutdown occur, LED lights up, engine is
running.
When safety-on delay counting is over, if module detects that oil pressure falls below
the low oil pressure alarm value or oil pressure switch signal is active, LED lights up,
low oil pressure failure occurs.
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GU304A Controller Operation Manual
When switching on working power source, if module detects that cooling coolant
temp exceeds the high coolant temp alarm value or temp switch signal is active, LED
lights up, high coolant temp failure occurs.
When switching on working power source, if module detects that running speed
exceeds the setting value of speed in module parameters, LED lights up, overspeed
failure occurs.
When switching on working power source, if module detects that half fuel level
switch signal is active, LED lights up, fuel can on engine stays at half fuel level
status.
When switching on working power source, if module detects that low fuel level switch
signal is active, LED lights up, fuel can on engine stay at low fuel level status.
When switching on working power source, if module detects that canopy temp switch
signal is active, LED lights up, high canopy temperature failure occur.
When switching on working power source, module detects that E-stop switch signal
is active, LED lights up, engine stays at the status of emergency stop.
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GU304A Controller Operation Manual
4. Installation Guide
4.1 The dimensional drawing of install hatch on panel, showing as above
attached.
The controller is secured by 2 special fittings. The shock-proof equipment must
be installed if the enclosure that installed on controller is directly installed on
Genset body or other heavy vibrant device.
4.2 Please read above 2.3 Typical Wiring Diagram or attached drawing for
wiring connecting.
4.3 The installations of P-sensor and T-sensor for engine:
P urpose P ort N o.
P -sensor 15
15 16
T-sensor 16
B attery cathode
S ensor C om . P ort
(unit enclosure)
G U 304A C O N TR O LLE R
5. Control and Operation Instruction
5.1 The Process of Start Control:
Operation Description
When power supply for controller is normal, fuel relay
energizes, fuel solenoid valve opens. When controller detects
that there is frequency or RPM input, the timer for safety-on
delay begins to count. If data of oil pressure and coolant temp
of engine unit is normal and no shutdown failure occurs,
controller displays running status after counting is over.
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GU304A Controller Operation Manual
5.2 The start and stop processes of engine, whose fuel solenoid valve is N. O.
type (different from N.C. type):
Start control process:
When start running, the fuel relay of controller will not energize, fuel solenoid valve is
off power, namely, the electromagnet of solenoid valve do not energize.
Stop control process:
During the stop process, controller outputs the power of fuel solenoid valve, fuel
solenoid valve energizes, engine begins to stop. After delay (according to the setting
stop delay), cut off the power of fuel solenoid valve.
Other control process is same as engine whose fuel solenoid valve is N. C. type.
6. Measure and Display Data
The voltage value is the input source (Battery)
Battery Voltage (V) voltage value of controller.
Oil pressure (Kpa) This data is from an external sensor
Coolant Temp (℃) This data is from an external sensor
Engine Running Speed (RPM) Signal from engine AC voltage or magnetic sensor
The accumulated count of engine each normal
Running Hour (RUN Hour) running time stored.
7. Warning and Shutdown Alarm
7.1 Warning
(NOTE: Warnings are non-critical failure conditions and do not affect the operation of
the generator system, they serve for drawing the operators’ attention to an
undesirable condition and removing it to make sure system continuous running.
When warnings occur, the status indicators flash, but failure will not be locked and
the unit will not shutdown. Once failure removed, warning indicator will be
automatically turned off.)
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GU304A Controller Operation Manual
Half Fuel Level controller detects the half fuel level switch of engine stay at close
status, failure LED “ ” lights up.
Low Fuel Level controller detects the low fuel level switch of engine stay at close
status, failure LED “ ” lights up.
High Canopy Temp controller detects the high temp switch of canopy on engine
stay at close status, failure LED “ ” lights up.
7.2 Shutdown Alarm
(NOTE: shutdown failures immediately lock system and stop engine, switching off
power is required for reset after failure removed.)
Low Oil Pressure after safety-on delay expired, controller detects that oil pressure
value has fallen below the low oil pressure alarm value or oil pressure switch stays
at close status, engine stops immediately, failure LED “ ” lights up, failure
relay making output.
High Temperature controller detects that engine coolant temp has exceeded the
high coolant temp alarm value or temp switch stays at close status, engine stops
immediately, failure LED “ ” lights up, failure relay making output.
Overspeed controller detects that engine running speed has exceeded the
overspeed alarm value, engine stop immediately, failure LED “ ” lights up,
failure relay making output.
Emergency Stop when emergency stop input signal is active, engine stops
immediately, failure LED “ ” lights up.
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GU304A Controller Operation Manual
8. Parameters Setting and Menu System
The configuration and modification for parameters adopt gradually increase and
decrease, when continuously press increase or decrease button, the unit digit changed
one by one, then the tens digit changed after ten unit digit changed, follow this logic,
and the hundreds digit changed after tens. Continuously press “ ” and “ ” 2s can
enter into setting status, press “ ” can scroll back to view menu, press “ ” and
“ ” at the same time to enter into modification, you can press “ ” or “ ” to
modify parameter at that time, after finishing modification press “ ” and “ ” at the
same time for confirmation. Press “ ” scroll page to quit and then press “ ” and
“ ” at the same time can quit setting status.
No. Item LED Default Value Range
0~1 / 0 (N.C.)
01 Fuel mode 0
/ 1 (N.O.)
0~1 / 0 (frequency)
02 H-sensor mode 0
/ 1 ( rpm)
03 Tooth quantity 120 1~999
04 Pair of poles 2 1~4
05 T-sensor mode 1 0~3 / 0 (not used)
06 P-sensor mode 1 0~3 / 0 (not used)
07 Safety-on delay 60s 0~600s
1~9999 RPM
08 Overspeed Alarm 1600RPM
/ 9999 (not set)
0~300 Kpa
09 Oil-P low Alarm 140Kpa
/ 0 (not set)
70~160℃
10 Coolant Alarm 105℃
/ 999 (not set)
11 Low battery Alarm 8V 0~25V
12 Auto scroll page 0s 0~10s
13 On line duplication
14 Quit
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GU304A Controller Operation Manual
8.1 The Definitions of P-sensor and T-sensor
For P-sensor and T-sensor, according to below table different No. stands for
different sensor mode. Bases on the specified No. of practical sensor mode in
following table, set the following No. at above No. 05 and No. 06 for the sensor
mode in the parameters setting.
No. P-sensor Mode T-sensor Mode
0 NOT USE NOT USE
1 VDO 10 bar VDO 120 degrees C
2 VDO 5 bar Datcon high
3 Datcon 10 bar Four-way
8.2 Static LED Display:
When controller is ready
Operation Description
If controller is not connected to P-sensor and T-sensor, the ℃
corresponding data display “OPEN”, LED display: Kpa
When controller set P-sensor and T-sensor are not used
Operation Description
Controller on standby or running status, the related data all ℃
display “----”, LED display: Kpa
When controller is normally running
Operation Description
RUN
Controller displays engine status and running information:
DCV
Kpa
Press “ ” or “ ” can switch display page ℃
RPM
HR
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GU304A Controller Operation Manual
8.3 Parameters Setting
For Example: (set controller at online program mode)
Operation Description
Continuously press “ ” and “ ” 2s at the same time, enter
into parameters setting menu, then LED display:
Continuously press “ ” until LED display:
Continuously press “ ” and “ ” at the same time enter into
program mode, controller no any display under this mode
and make sure the power supply is normal. Controller will
automatically reset and operate over again after the
procedure was correctly duplicated using special program
software via communication cable, or it will not exit this
status until switching off working power.
For Example: (Set tooth quantity at 125)
Operation Description
Continuously press “ ” and “ ” 2s at the same time, enter
into parameters setting menu, then LED display:
Continuously press “ ” until LED display:
Continuously press “ ” and “ ” 2s at the same time enter
into modification, LED display:
Press “ ” or “ ” to change parameter, change at 125,
then LED display:
After finishing modification press “ ” and “ ” at the same
time for confirmation, then continuously press “ ” to QUIT,
and then press “ ” and “ ” at the same time for quit.
For Example: (Set controller overspeed at 1650)
Operation Description
Continuously press “ ” and “ ” 2s at the same time, enter
into parameters setting menu, then LED display:
Continuously press “ ” until LED display:
Continuously press “ ” and “ ” 2s at the same time enter
into modification, LED display:
Press “ ” or “ ” to change parameter, change at 1650, then
LED display:
After finishing modification press “ ” and “ ” at the same
time for confirmation, then continuously press “ ” to QUIT,
and then press “ ” and “ ” at the same time for quit.
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GU304A Controller Operation Manual
9. Preparation before Start the Controller
9.1 Make sure controller is fixed well and its install meets ambient requirement.
9.2 Confirm all wiring connections of controller meet electric specification and
especially ensure the correct polarity of DC supply source.
9.3 We recommend mounting an “Emergency Stop” button externally. The
emergency stop input could be connected to N.O. contact of emergency stop
push button, and the other contactor point be connected to the battery negative.
9.4 Switch on DC working power, make sure the preset parameters meet practical
operating conditions, such as fuel mode, T-sensor mode, P-sensor mode and
the preset value of kinds of parameters, etc.
10. Technical Parameters
DC Working Source Voltage 12V/24V (8-32VDC continued)
Max. Power Consumption ≤2W
The Measure Range of PICK-UP Voltage Frequency 1-70VAC (1-10000Hz)
The Measure Range of AC Voltage Frequency 50V≤ voltage≤ 300V (5-70Hz)
Control Output Capacity 3A/30VDC
Working Ambient Temperature -20 to 70℃
Storage Ambient Temperature -40 to 80℃
Version：048A100301
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