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Figure 4-12 Standstill tolerance
4.7.1 Details and parameterization
WARNING
Drive can be forced out of the SOS position by mechanical forces
A drive in position control can be forced out of the "Safe Operating Stop" (SOS, stop Category
2 according to 60204-1) position by mechanical forces that are greater than the maximum
torque of the drive. This unexpected drive motion then initiates a Category 1 stop function
according to EN 60204-1. The alarms for SS1 and STO must be carefully observed. This
unexpected drive motion can result in death and serious injury.
● To rule out any unexpected motion, use a brake with safe monitoring (see SBC
(Page 109)).
This function serves for failsafe monitoring of the standstill position of a drive.
● Drive stopping is monitored using an SOS tolerance window (p9530).
● Effect on "Setpoint speed limit effective" (r9733[0...2]):
If SOS is selected, setpoint 0 is specified in r9733[0...2].
Safety functions integrated in the drive
4.7 SOS
Safety Integrated (with SINAMICS S120)
126 Commissioning Manual, 02/2020, A5E46305916B AB
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