Wheels, Drive System 97Service Manual – SC2000
Wheels, Drive System
Functional Description
Machine movement is provided by the gearmotor unit
(M3).
The gearmotor unit (M3) consists of an electrical mo-
tor, a reduction unit with differential, an electromag-
netic brake (BRK) (built in the electrical motor) and
driving wheels. It is fastened to the machine frame.
The electromagnetic brake keeps the machine braked
when the machine is off or whenever it is stopped.
The electromagnetic brake is equipped with an un-
locking lever, to easily move the machine manually.
After moving the machine manually, engage the elec-
tromagnetic brake again.
Warning! Do not use the machine when the electromagnetic brake is disengaged. If the
lever is not repositioned after pushing/towing the machine, the electromagnetic
brake is disengaged. For safety reasons, it is recommended to disengage the
electromagnetic brake only for the time necessary to manually move the machine.
The operator regulates the transfer speed, the work-
ing speed and reverse gear by means of the drive
pedal, which is directly connected to the drive pedal
potentiometer (RV1). The reverse gear is selected by
pressing the right lever on the steering wheel:
The function electronic board (EB1) checks that the
drive pedal is not pressed when the machine is start-
ed; otherwise, an alarm is generated (see “Function
Electronic Board Alarm Codes” paragraph, in “Con-
trol System” chapter) and the drive system is inhib-
ited.
When the drive 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 elec-
tronic board (EB1) powers the electromagnetic brake
to release the wheel, then activates the gearmotor
(M3) with a proportional voltage on the basis of the
pedal position. The acceleration ramps and maximum
speed can be set via the corresponding parameters
(see “Displaying and Modifying User Modiable Pa-
rameters” paragraph, in “Control System” chapter).
An anti-skid system, built in the function electronic
board, 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 system activation is shown by the icon on
the display.
The automatic anti-skid system constantly detects
lateral acceleration using an accelerometer installed
in function electronic board (EB1). If the lateral accel-
erometer detects a speed higher than the preset value
(set using the AMAX parameter, see “Displaying and
Modifying User Modiable Parameters” paragraph,
in “Control System” chapter) the system reduces the
speed so the lateral acceleration remains below this
limit.
The driver’s seat microswitch is located inside the
driver’s seat and the machine drive system is only en-
abled if the operator is seated in the driver’s seat.
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