1-6
MAIN CONTROLLER
Operation Outline
(1) Power ON, default condition
• Turning on the key switch supplies power to the
logic card and display unit. The display unit
shows three hourmeters in sequence, then
resumes the normal display mode.
• About one second after power is supplied to the
logic card, the controller turns the line contactor
ON to provide power to the main circuit. When
the line contactor turns ON, the steering motor
starts rotating.
• By setting the DRS switch set to D or S, it is
possible to activate the self-diagnostic function,
set vehicle characteristic parameters with setup
options and perform an analysis of malfunction
data. Remove the main fuse.
(2) Normal mode (RUN mode)
• When the direction lever is moved and the
accelerator pedal is pressed, the vehicle moves
forward or backward. During deceleration, the
motors conduct various regenerative operations
according to the settings.
• The steering system creates a torque difference
between the right and left motors according to
the steering wheel turning angle to change the
vehicle’s traveling direction.
• Moving a hydraulic lever activates the pump
motor and provides hydraulic power.
• The controller monitors operating conditions.
When an abnormality occurs, the display unit
indicates an error code and activates an
appropriate fail-safe function. The error code is
stored in the logic card memory.
Drive System
Neutral Position
When the direction lever is in the neutral position, the
controller turns the regeneration contactor OFF and
cuts off the current to the armature. When the lever is
moved to the neutral position while the vehicle is
moving, the vehicle continues traveling due to inertia.
When the lever is shifted to neutral from forward or
reverse position, the controller maintains the neutral
mode for five seconds, and the regeneration contactor
stays ON.
Powering
(1) Outline
• Powering is a condition in which the motors are
powered by the battery and the controller
supplies a current determined by the powering
characteristic. The powering characteristic is an
electric current curve relative to vehicle speed
based on the acceleration parameter, as shown in
the diagram. The current demand value is
obtained from the acceleration and vehicle
speed.
• The power characteristic can be selected from
three types by SUO #9: Economy, Standard and
High Power.
• The current demand rise rate is selectable.
(Acceleration rate: SUO #8)
(2) Truck mode
• The truck mode can be selected from A to E,
each with preset values for maximum vehicle
speed, acceleration rate, power, automatic
regeneration power, start lift speed, top lift speed
and tilt speed.
• SUO #1 is used for setting the truck mode.
Details are shown on page 1-8.
• When the truck mode is set, the values shown in
the table are entered in the applicable set option
items. When default settings are changed, the
indication (A to E) flashes to indicate that the
settings are modified.
• If the truck is set in high power mode, the
battery life will be less than economy and
standard mode.
