Driving Wheel System
116
Service Manual – SC3000
Driving Wheel System
Functional Description
The driving wheel system moves the machine forwards.
The operator adjusts the operating speed with the accelerator (RV1). The reverse lever is under the steering
wheel.
The driving wheel is connected to the steering system. The electromagnetic brake is built into the drive system
motor and keeps the machine braked when the machine is off or stopped.
An anti-skid system reduces the speed to a safe speed when turning and when the machine tilts laterally in
order to avoid sudden skidding, thus increasing machine stability in all conditions.
The driver's seat microswitch is located inside the driver's seat and the machine drive system is only enabled
if the operator is seated in the driver's seat.
The function electronic board (EB1) checks the drive pedal is not pressed when the machine is turned on. If it
is pressed an alarm is generated (see paragraph “Function electronic board alarm codes” in chapter “Control
system”) and the drive system is disabled.
When the pedal returns to the rest position, the alarm is automatically deactivated (without having to turn
the machine off and on again).
When the drive pedal is pressed, the function electronic board (EB1) powers the electromagnetic brake to
release the wheel, then activates the driving wheel motor (M3) with a proportional voltage on the basis of the
pedal position. The acceleration ramps and top speed can be set with the relevant parameters (see paragraph
“Display and change of parameters which can be set by the user” in chapter “Control system”).
Reverse is enabled when the microswitch on display electronic board (EB2), activated by lever (2), is pressed.
The signal is sent by the display electronic board (EB2) to function electronic board (EB1) like any other signal
from a dashboard push-button.
The automatic anti-skid system constantly detects lateral acceleration using an accelerometer installed in
function electronic board EB1. If the lateral accelerometer detects a speed higher than the preset value (set
using the AMAX parameter, see paragraph “Display and change of parameters which can be set by the user”
in chapter “Control system”) the system reduces the speed so the lateral acceleration remains below this limit.
The Anti-skid control
LED
indicates the system is automatically reducing the speed to below that con-
trolled by the accelerator pedal position.
