Siemens PM330 - Safe Stop 1 (SS1-T, Time Controlled)

Fundamental safety technology principles
7.2 Standard safety functions according to EN 61800-5-2
Power Module PM330
Hardware Installation Manual, 12/2018, A5E32844552B AF
107
7.2.2
Safe Stop 1 (SS1-t, time controlled)
Figure 7-2 Safe Stop 1 (SS1-t, time controlled)
Safe Stop 1 (time controlled) causes the motor to be braked (this function is integrated in the
drive) - and after a specified time interval, the Safe Torque Off function is initiated. This
function corresponds to Stop Category 1 according to EN 60204-1.
The Safe Stop 1 function (SS1-t) function means that the motor is stopped and then the
torque-generating energy is shut down (STO). When SS1-t is activated, the inverter brakes
the motor along a braking ramp. This happens via the braking function integrated in the drive
along the OFF3 ramp.
SS1-t corresponds to the SS1-t function according to EN 61800-5-2.
Typical applications
SS1-t can be used wherever the load torque cannot stop the motor in a sufficiently short time
as a result of friction - or where there is a safety risk if the drive coasts down (STO).