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3. CONTROL SYSTEM
3.1 GENERAL DESCRIPTION
The controller assembly consists of two inverter units which control the drive and the pump
motors, respectively (excluding trucks with an Orbitrol steering system), and an EPS controller
unit which controls the EPS motor, as shown in Figures 3.1 and 3.4.
3.1.1 INVERTER UNIT
The inverter unit is a device consisting of a CPU board and FET modules and converts direct
current to 3-phase alternating current.
The CPU board receives various electric signals through the operation of the accelerator pedal
and valve control levers to control the drive motor and the pump motor through the inverter’s FET
modules.
The operating status of the drive motor and the pump motor is detected by the rotation sensor,
thermo-sensor and current sensor to feed the information back to the CPU board.
3. CONTROL SYSTEM
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