Siemens SINUMERIK 808D ADVANCED Series Commissioning Manual page 103

Wiring
WARNING
Unexpected drop of a hanging axis due to incorrect connection of 24 V power supply
When the servo system is used as a hanging axis, the axis will drop if the positive and negative poles of the 24 V power
supply are connected inversely. Unexpected drop of the hanging axis may cause material damages and personal injuries.
Make sure that the 24 V power supply is correctly connected.
Note
Make sure that you use different 24 V power supplies for the drive and for inductive loads such as relays or solenoid valves;
otherwise, the drive may not work properly.
Note
Using the STO function
The STO1, STO+ and STO2 are short-circuited at the factory.
It is not allowed to use the STO with a hanging axis because the axis may drop. When the STO function is to be used, you
must remove the short-circuit stick before connecting the STO interfaces. The safety function of the servo drive is SIL 2
(EN61800-5-2). If you do not need to use it any more, you must reinsert the short-circuit stick. Otherwise, the motor will not
run.
The wiring for factory setting and using the STO function is shown as follows:
If you use the STO function with the SINUMERIK 808D ADVANCED control system, perform the wiring as illustrated below:
Commissioning Manual
6FC5397-4EP10-0BA8, 07/2018
103