Soft Torque - Siemens SIRIUS 3RW50 Manual

Functions

7.6 Soft torque

7.6 Soft torque
Principle of operation of soft torque during starting
The Soft Torque function reduces the drive acceleration rate shortly before the motor
reaches its rated operating speed. This produces an almost linear speed curve. This helps to
ensure smooth movement of a conveyor belt, for example, and so prevent fragile goods on
the belt from tipping over.
Torque curve
①
②
③
130
Torque with direct start
Torque without Soft Torque
Torque with Soft Torque
SIRIUS 3RW50 soft starter
Manual, 09/2019, A5E35628455002A/RS-AA/001