Safe Stop 2 (SS2)

The SS2 function shuts down a motor quickly and safely and then activates the SOS function after coming to a standstill.


The Safe Stop 2 function can safely stop the drive in accordance with EN 60204-1, Stop Category 2. When the SS2 function is selected, the drive brakes autonomously along a quick-stop ramp. Unlike SS1, the automatic speed control remains operational afterward, i.e. the motor can provide the full torque required to maintain zero speed. Standstill is safely monitored (Safe Operating Stop function).


As with SS1, the SS2 function ensures the quickest possible deceleration of the motor. However, the motor power is then not switched off, but prevented by a control system from leaving the standstill position even if external forces are applied to it. SS2 has a wide range of applications, for instance in production machines, machine tools.

Customer benefits

The SS2 function ensures a rapid axis stop. Because the control remains active, after the safety function is deselected, productive operation can continue without referencing. This ensures short setup and standstill times and high productivity.