VLT
®
Soft Starter Pocket Guide 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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