Siemens SINAMICS G220 Operating Instructions Manual page 662

Functions
14.12 Safety Integrated
Description of function
Figure 14-225
①
②
③
④
⑤
Example
Applications include all machines and systems with moving axes (for example, conveyor
technology, handling).
With STO, maintenance work on the machine with an open protective door is possible, for
example. An EMERGENCY STOP with electromechanical disconnection is not required.
Parameters
The following list contains the parameters of the "Safe Torque Off (STO)" function.
Number
p9603.0...1
p9604.0...30
660
Flow diagram STO
Action
Selection of STO
Coast down
Deselection of STO
Signal change at ON/OFF1
from 1 to 0
Signal change at ON/OFF1
from 0 to 1
Name
SI control
SI enable
Motor/converter response
• The converter detects selection of STO and signals the status
"STO active" (r9722.0).
• The converter interrupts the torque-generating energy feed to
the motor.
• If you use a line contactor, the converter opens the line contac‐
tor.
• The "switching on inhibited" status prevents the motor from
restarting automatically.
• The motor coasts down to a standstill.
• The converter detects deselection of STO.
• The converter is ready to start again.
• The motor starts again.
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
Unit
SINAMICS G220 converter