9.1 Signal Measuring at
the Drive Control Unit
•
Check the following items when testing the drive control unit. If the respective signals
do not apply, the drive control unit does not work sufficiently.
In the circuit diagram the drive control unit is designated with A4.
When testing the drive control unit, be supported by the circuit diagram and check the
ti
th
i
th
l t
d
b
l
b
l
i
connections there since the complete procedure became more complex by releasing
via A1, closing the drive rheostat switch, the direction switch and the K4 relay. There
is function interaction and the switches and the relay are connected in series.
Note
: The red drive control unit cable with integrated fuse is not connected and
Note
: The red drive control unit cable with integrated fuse is not connected and
remains free even after replacement of the drive control unit.
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