Toyota 7FBEF 15, Service Manual

Page: 27 / 185

2-10
MAIN CONTROLLER
■
General
AC System
This controller is multi-functional making use of most advanced electronic technologies such as inverter
control using a microcomputer, the function for CAN communication between the main controller and the
drive/pump motor driver, and the function for communication with multi-screen display.
The power select and power keep functions have been realized by making use of the AC motor drive
system features.
The AC motor realized greater output than the DC motor in the same size.
The AC motor drive system output characteristics are determined by the combination of the alternate
current and frequency output from the controller.
Optimum combinations for multiple characteristics are mapped and stored in the controller for power
selection by map switchover.
The output characteristics of the DC motor drive system, on the other hand, are determined by the
controller output voltage itself. The characteristic of the motor itself when the battery voltage is applied
(chopper duty: 100%) is the maximum output. The performance, therefore, drops as the battery voltage
decreases.
On the other hand, the AC motor drive system maintains the performance by changing the AC current and
frequency combination according to the battery discharge level. The power keep function is thus realized.
Power select function
The traveling/material handling performance can be selected from H, P and
S modes by operating the buttons.
Power keep function
The operating performance is maintained even when the battery discharge
proceeds for longer, efficiency operation (only when the P or S mode is
selected).
AC motor maximum output
AC and DC power system output
characteristics with fully charged battery
AC power system output
characteristics with discharged battery
DC power system output
characteristics with
discharged battery
T
orque
AC power system output
characteristics
DC power system output
characteristics
(DC motor maximum output)
Rpm
T
orque
Rpm