Functions
7.3 Run-down
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
97
Coasting down
Operating principle
Coasting down means the power supplied to the motor via the soft starter is interrupted
when the ON command is removed from the soft starter. The motor will coast down freely
without closed-loop control, driven only by the mass inertia (centrifugal mass) of the rotor
and load. This is also referred to as natural stopping. A larger centrifugal mass means a
longer stop time without load.
Coasting down is used for loads that make no special demand on the startup characteristic.
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