Siemens SIRIUS 3RW52 - Soft Torque

Functions
7.6 Soft Torque
SIRIUS 3RW52 Soft Starter
102 Manual, 01/2019, A5E35630451002A/RS-AD/004
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 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.
①
Torque without Soft Torque
②
Torque with Soft Torque
③
Torque with direct start
n
e
Rated motor speed
①
Motor speed without Soft Torque
②
Motor speed with Soft Torque