Danfoss Drives · DKDD.PB.551.A1.02 | 17
DC braking and soft braking both reduce motor stopping time,
unlike soft stopping which increases the stop time on frictional
loads.
DC braking uses DC injection to reduce the motor’s stopping time.
The soft starter slows the motor to approximately 70% of its full
running speed, then applies brake torque to stop the motor in the
selected braking time.
DC braking support is built into MCD 500 soft starters, and no
additional equipment is required. MCD 500 DC braking controls all
three phases, which reduces stress on the motor compared with
two phase braking solutions.
Soft braking uses reversing contactors on the input side of the
starter to start the motor in the reverse direction, which applies
braking torque to the load.
Soft braking causes less motor heating and provides more
braking torque for a given current than DC braking, and is better
for extremely high inertia loads (e.g. band saw and circular saw
applications).
Braking:
What are DC braking and soft braking?
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