Siemens SIRIUS 3RW50 Manual page 131

Speed curve
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①
②
Principle of operation of Soft Torque during stopping
The Soft Torque function enables the motor to coast down smoothly at an almost constant
rate of deceleration. Ensuring that the motor coasts down smoothly is particularly useful for
stopping pumps in order to prevent water hammers in the connected piping. The Soft Torque
function for stopping can only be activated when a stopping time of more than 3 s is set.
SIRIUS 3RW50 soft starter
Manual, 09/2019, A5E35628455002A/RS-AA/001
Rated operating speed of the motor
Motor speed without Soft Torque
Motor speed with Soft Torque
Functions
7.6 Soft torque
131