For Internal Office Use Only
9.1 SIGNAL MEASURING AT THE DRIVER
CONTROL UNIT
2. Drive direction
The drive direction is set via the direction selector switch S7 but closing of this switch
alone is not sufficient for signalling the selection to the drive control unit.
Simultaneous releasing of A1, closing of the drive rheostat switch S8 and the K4
relay switching contact is required.
Release on A1
The control unit A1 monitors the seat contact switch and all other functions of the
machine. The control unit releases driving only after all conditions (= seat contact
switch closed) have been met. Releasing means that the contacts A1:X4:3 and
A1:X3:1 are connected on the A1 module to initiate transfer of the battery minus
signal from the A1:X4:3 contact to the A1:X3:1 contact. Only if the battery minus
signal applies at A1:X3:1 release is given as first condition for the drive control unit
to detect the drive direction.
