Description Of Functions - Siemens SIMATIC ET 200pro Series Operating Instructions Manual

Advanced commissioning
7.7 Safe Torque Off (STO) safety function
7.7.1

Description of functions

How does STO function?
Table 7- 13
1. The converter detects via the F0 rail that STO
2. The converter prevents energy from being fed
3. The converter signals "STO is active".
Figure 7-9
If the motor is still rotating when STO is selected, then it coasts down to standstill.
The STO safety function is standardized
The STO function is defined in IEC/EN 61800-5-2:
"[...] [The converter] does not supply any energy to the motor which can generate a torque
(or for a linear motor, a force)."
The STO converter function complies with what is defined in the standard.
112
The principle of operation of STO
Safe Torque Off (STO)
has been selected.
to the motor. When STO is active, the motor
does not generate any torque.
Principle of operation of STO when the motor is stationary and when the motor is rotating
The converter with active STO prevents machine
components from inadvertently starting.
Standard converter functions linked with STO
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If you use a motor holding brake, the converter
closes the brake.
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Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B AE
SIMATIC ET 200pro FC-2 converter