24 V Power Supply/Sto; Using The Sto Function; Assembling The 24 V Power Supply And Sto Cable Terminals - Siemens SINAMICS V90 Getting Started

4.4

24 V power supply/STO

The pin assignment for the 24 V power supply/STO interface is shown as follows:
Interface
Wiring
WARNING
Material damages and personal injuries by the drop of a hanging axis
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.
WARNING
Material damages and personal injuries by the drop of a hanging axis
It is not allowed to use the STO with a hanging axis because the axis may drop. Unexpected drop of the hanging axis may
cause material damages and personal injuries.
Note

Using the STO function

The STO1, STO+ and STO2 are short connected at the factory setting.
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.
For detailed information about the STO function, refer to chapter "Safety Integrated basic functions" of SINAMICS V90,
SIMOTICS S-1FL6 Operating Instructions.

Assembling the 24 V power supply and STO cable terminals

The procedure of assembling a 24 V power cable terminal or an STO cable terminal is the same as that for a power cable
terminal on the drive side of the V90 200 V servo drives.
For more information, see the SINAMICS V90, SIMOTICS S-1FL6 Operating Instructions.
Getting Started
A5E36037886-003, 04/2017
Signal name
STO 1
STO +
STO 2
+24 V
M
Maximum conductor cross-section: 1.5 mm
Safe torque off channel 1
Specific power supply for safe torque off
Safe torque off channel 2
Power supply, 24 VDC
Power supply, 0 VDC
2
Description
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