Lenze E94AYAE SM301 - Manual (Page 61)

Safety engineering
Safety functions
Safe stop 2
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61 EDS94AYAE EN 7.0
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Note!
The position of the motor is saved when the SOS state is entered. In the SOS
state, relative position changes are added and compared to the permissible
value in the parameter "Tolerance window Delta p=0". When the SOS state is
quit, the maximum relative position change is displayed in code C15312.
When the SOS state is requested again, the maximum value of the last
position changes is reset to zero.
Example: The states "SS2 active" and "SOS active" are interrupted by a STO
request. When the STO request is reset, an immediate transition to the SOS
state takes place. This causes a reset of the current position deviation to p=0.
After the safe operational stop is interrupted by the STO, the motor may have
a different position due to an external torque.