Functions
7.2 Start-up
SIRIUS 3RW55 soft starter
86 Manual, 08/2018, A5E35630887002A/RS-AB/002
Soft starting with torque control
Operating principle
Torque control means that the torque generated in the motor is linearly increased from a
parameterizable starting torque up to a parameterizable end torque within an adjustable
starting time.
The advantage over a voltage ramp is the improved mechanical run-up behavior of the
machine. The soft starter controls the torque generated on the motor continuously and
linearly according to the set parameters until the motor has completed its run-up.
For optimum torque control during the starting procedure, enter the motor data of the motor
connected to the soft starter in the selected parameter set.
● Uniform, load-mitigating ramp-up
● Machines that require a breakaway pulse, e.g. mills, crushers and drives with journal
bearings.
Torque with direct-on-line starting without the 3RW55 soft starter
Torque with short ramp-up time
Torque with long ramp-up time
Acceleration torque = Difference between activation torque and torque of load
Parameterizable limiting torque
Parameterizable starting torque
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