Siemens SINAMICS SIMOTICS S200 PROFINET - Page 404

Requirement
WARNING
Unexpected motor movement through active Safe Torque O󹪜
There ma
y be unexpected motor movements if the Safe Torque O󹪜 (STO) function is active. For
instance, the motor can coast down to a standstill or a hanging load may accelerate the motor.
Unexpected movements can lead to damage to property, risk to persons, severe injury and
death.
• Take account of the way the Safe Torque O󹪜 (STO) function works when you perform risk
assessments of the machine or system.
• Prevent movements of the motor, for example by using a holding brake.
The STO function is enabled.
Description of function
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Figure10-19 Flow diagram STO
Action Motor/converter response
① Selection of STO
• 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 contactor.
• The "switching on inhibited" status prevents the motor from restarting
automatically.
② 
• The motor coasts down to a standstill.
③ Deselection of STO
• The converter detects deselection of STO.
Functions
10.7Safety Integrated (for S200 PN only)
SINAMICS S200 PROFINET servo drive system with SIMOTICS S-1FL2
402 Operating Instructions, 11/2023, FW V6.3, A5E51646752B AB