1-1
CONTROLLER
Controller System
System Configuration
The truck is controlled by the logic unit and the
inverter.
The system configuration is classified into two types
according to the lifting control system: the Contactor
Control Type and the Transistor Control Type.
The Contactor Control Type controls the DC pump
motor by the contactor. The Transistor Control Type
controls the AC induction pump motor by the inverter.
The logic unit is the main part of the control system and
controls the traveling, lifting and safety function
systems. The logic unit is connected to the inverter,
display unit and other control switches.
The inverter controls the AC induction traction (drive)
motor and the AC induction pump motor.
The logic unit and the inverter are linked together by
the Controller Area Network (CAN) to communicate
with each other. The logic unit sends the motor control
command to the inverter and the inverter sends the
sensing data to the logic unit.
The display unit indicates the truck conditions and
setting data.
The logic unit communicates with the display unit
through the serial communication protocol (RS232C).
The system configurations of the Contactor Control
Type and the Transistor Control Type are as follows.
Traction motor
(Drive motor)
Pump motor
Traction Inverter
Logic Unit
Key switch
Direction lever
Accelerator
Service brake
Parking brake
Seat switch
Seat belt switch
DRS switch
Other switches
(Horn switch etc.)
CAN bus
U
V
W
IM
Sensors
Lift cylinder
Tilt cylinder
Hydraulic
control valve
assembly
Hydraulic
pump
Lift lock
solenoid
valve
Micro
switches
DSP card
Logic card
Traveling control
Lifting control
Safety function
etc.
M
Steering
motor
Contactor
Battery
Warning buzzer
Display
Motor control command
Sensing data
Hydraulic lever
input
Lift lock solenoid control signal
Contactor control signal
RS232C
Electric power
M
Input switch signals
211390
System Configuration for Contactor Control Type
