Commissioning Sto - Siemens SINAMICS G120 Operating Instructions Manual

Application examples for the STO function
The STO function is suitable for applications where the motor is already at a standstill or will
come to a standstill in a short, safe period of time through friction. STO does not shorten the
run-on of machine components with high inertia.
Examples
When the Emergency Stop button is
pressed, a stationary motor should not
unintentionally start.
A central Emergency Stop button must
prevent the unintentional acceleration
of several motors that are at a stand‐
still.
Prerequisite for STO use
In order to use the STO safety function, the machine manufacturer should have already
performed a risk assessment, e.g. in compliance with EN ISO 1050, "Safety of machinery -
Principles of risk assessment". The risk assessment must confirm that the inverter is permitted
for use in accordance with SIL 2 or PL d.
Restriction by the Power Module
The use of the STO safety function is possible with almost every Power Module. There may
be restrictions for a PM230 Power Module:
Power Module
PM230 in degree of protec‐
tion IP55
PM230 in degree of protec‐
tion IP20 and Push Through
6.14.2

Commissioning STO

We recommend that you commission the safety functions using the STARTER or Startdrive
PC tool.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Constraint
Article numbers 6SL3223-0DE . . - . . A . :
The STO safety function is not possible.
Article numbers 6SL3223-0DE . . - . . G . :
The basic STO function is possible.
Article numbers 6SL321 . -1NE . . - . . L . :
The STO safety function is not possible.
Article numbers 6SL321 . -1NE . . - . . G . :
The basic STO function is possible.
Tools to commission the inverter (Page 130)
6.14 Safe Torque Off (STO) safety function
Possible solution
● Interconnect the Emergency Stop pushbutton with a fail-
safe inverter digital input.
● Select STO via the fail-safe digital input.
● Evaluate the Emergency Stop button in a central control.
● Select STO via PROFIsafe.
Advanced commissioning
233