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 Possible solution
When the Emergency Stop button is pressed, a sta‐
tionary motor should not unintentionally start.
• Wire the Emergency Stop button to a fail-safe
input of the converter.
• Select STO via the fail-safe input.
A central emergency stop button must prevent the
unintentional acceleration of several motors that are
at a standstill.
• Evaluate the Emergency Stop button in a cen‐
tral 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 conrm that the converter is permitted
for use in accordance with SIL 2 or PL d.
7.15.2 Commissioning STO
7.15.2.1 Commissioning tool
We recommend that you commission the safety functions using a commissioning tool (e.g.
Startdrive or SINAMICS G120 Smart Access).
Commissioning tools (Page106)
The following sections only introduce the commissioning process of Startdrive as examples.
For more information on that of the SINAMICS G120 Smart Access, see the SINAMICS G120
Smart Access Operating Instructions.
Overview of the manuals (Page588)
7.15.2.2 Safety function password
Overview
The password protects the settings of the safety function from being changed by unauthorized
persons.
Function description
Do you have to assign a password?
You do not have to assign a password.
Advanced commissioning
7.15Safe Torque O (STO) safety function
SINAMICS G115D Wall Mounted distributed drive
236 Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
To Next Page
Loading...
Need help?
General