9.1 Signal Measuring at
the Drive Control Unit
1 Self test
1. Self-test
Before the drive control unit is operable, it executes a self-test. This self-test starts
automatically after switching on the machine with key switch.
If, during this self-test, the drive control unit detects an error, the LED on the unit
flashes to signal non-operability The machine will then not start riding
flashes to signal non operability. The machine will then not start riding.
Key switch ON -> the b signal has to apply at A4:X51:2.
Then the self-test starts and the result is signalled by the LED of the drive control unit.
Only if the LED lights permanently, the drive control unit is operable. If the LED
y
g
p
y
p
flashes, check for possible causes of error with the table below.
53