Siemens SIRIUS 3RW55 Equipment Manual page 159

Soft starters and solid-state switching devices

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Torque characteristic with braking delay

Property damage due to DC braking pulses

DC braking pulses cause a higher current load and motor-specific noises and vibrations.

This can lead to premature failure of motor bearings. It may be necessary to overdimension the

3RW55 soft starter.

SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters

Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006

DC braking torque

Stop command on the 3RW55 soft starter

DC braking delay (coasting down)

Dynamic braking torque

Stopping time

Rated torque

8.2 Run-down

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Sirius 3rw55 failsafe