Prerequisite For Sto Use; Commissioning Sto; Commissioning Tools; Safety Functions Password - Siemens SINAMICS G110M Operating Instructions Manual

Advanced commissioning

6.8 Safe Torque Off (STO) safety function
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 standstill.
6.8.2

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.
6.8.3

Commissioning STO

6.8.3.1

Commissioning tools

We recommend that you commission the safety functions using the STARTER or Startdrive
PC tool.
6.8.3.2

Safety functions password

What is the purpose of the password?
The password protects the settings of the safety function from being changed by
unauthorized persons.
Does the password need to be set?
The password does not need to be set.
The machine manufacturer decides whether or not a password is required.
The probabilities of failure (PFH) and the certification of the safety functions also apply when
no password has been set.
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Possible solution
Wire the Emergency Stop button to a fail-
•
safe input of the inverter.
Select STO via the fail-safe input.
•
Evaluate the Emergency Stop button in a
•
central control.
Select STO via PROFIsafe.
•
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 06/2016, FW V4.7.6, A5E31298649B AG