Danfoss Drives · DKDD.PB.551.A1.02 | 39
Soft braking is a technique used by the soft starter to reduce
motor stopping time, unlike soft stopping which increases the stop
time on frictional loads. Soft braking requires the use of reversing
contactors.
When the soft starter receives a stop command, it operates the
reversing contactor connected on its input side to soft start the motor
in the reverse direction. This applies braking torque to the load.
Motor speed detection is required to shut down the braking at
motor standstill.
Soft starters can also use ‘DC braking’ to reduce the stopping time,
but soft braking causes less motor heating and provides more
braking torque for a given current, and is better for extremely high
inertia loads (e.g. band saw and circular saw applications).
Soft Braking: What is soft braking?
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