Siemens SINAMICS G120C, Руководство по эксплуатации

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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 time of machine components.
Examples Possible solution
When the Emergency Stop button is
pressed, a stationary motor should not
unintentionally start.
● Interconnect the Emergency Stop pushbutton with a fail-
safe inverter digital input.
● Select STO via the fail-safe digital input.
A central Emergency Stop button must
prevent the unintentional acceleration
of several motors that are at a stand‐
still.
● Evaluate the Emergency Stop button in a central control.
● Select STO via PROFIsafe.
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.
6.15.2 Commissioning STO
We recommend that you commission the safety functions using the STARTER or Startdrive
PC tool.
Tools to commission the inverter (Page 116)
6.15.2.1 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.
Advanced commissioning
6.15 Safe Torque Off (STO) safety function
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
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