Siemens SINAMICS G120D - Backing Up Data and Series Commissioning; External Data Backup

Advanced commissioning
7.9 Safe Torque Off (STO) safety function
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
257
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
stationary motor should not unintentionally start.
• Wire the Emergency Stop button to a fail-
safe input of the inverter.
• 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
central control.
• Select STO via PROFIsafe.
7.9.2
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.
7.9.3
Commissioning STO
7.9.3.1
Commissioning tools
We strongly recommend that you commission the safety functions using a PC tool.
Table 7- 33 PC-based commissioning tools
Download
Article number
More information
STARTER
(http://support.automation.siemens.
com/WW/view/en/26233208)
6SL3072-0AA00-0AG0 STARTER videos
(http://www.automation.siemens.com
/mcms/mc-drives/en/low-voltage-
inverter/sinamics-
g120/videos/Pages/videos.aspx)
Startdrive
(http://support.automation.siemens.
com/WW/view/en/68034568)
6SL3072-4CA02-1XG0 Tutorial
(http://support.automation.siemens.c
om/WW/view/en/73598459)