28 | Danfoss Drives · DKDD.PB.551.A1.02
Soft starters can limit start current to any specied level, but the
practical minimum depends on the motor and load. Reducing
the start current reduces the torque produced by the motor, so
the load will stall if the start current is too low. In order to start
successfully, the motor must produce more acceleration torque
than the load requires throughout the start.
Successful start:
Unsuccessful start:
Start current can be estimated based on previous experience, or
the motor and load speed/torque curves can be analysed for a
precise calculation.
Minimum Start Current: What is the minimum start
current required by a soft starter?
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