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Drive
9.
The drive controls have their own integrated diagnostics and a self-test.
Therefore, the function of the drive control units is blocked when the machine is
turned on if the speed control potentiometer is in neutral or is not recognised as
being in neutral.
The same behaviour applies after the seat contact switch has opened and is
closed again.
The speed control potentiometer must also be in neutral when closing the seat
contact switch; or to be more precise: it must be recognised as being in neutral
by the drive control.
If the drive control unit does not recognise that the speed control potentiometer
is in neutral, it shows flashing signals (LED) at the drive control unit.
These messages are transferred to the machine control unit via the CAN bus,
where they are evaluated.
Different drive control units are used for the front and rear wheel drive. These
must not be switched round.
Slide 79
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