26 | Danfoss Drives · DKDD.PB.551.A1.02
Key Benets: What are the key benets of soft start?
Soft start enhances motor start performance in many ways.
• The gradual application of voltage or current avoids the voltage
and current transients associated with electro-mechanical
reduced voltage starters.
• Acceleration is also smoother, as soft start avoids the torque
transients associated with electro-mechanical reduced voltage
starters.
• Constant current control gives higher torque as motor speed
increases, resulting in lower start currents and/or shorter start
times
• Start performance can be adjusted to suit the motor and load,
including exact control over the current limit.
• Soft starting provides reliable performance even with frequent
starts, or if load characteristics vary between starts (e.g. loaded
or unloaded).
Soft starters also provide a range of features not available from
other reduced voltage starters. This includes soft stop, which helps
eliminate water hammer and DC braking.
Other features such as built-in protection for the motor
and system, and metering and monitoring options, can
reduce the overall installed cost of the equipment and
reduce the long-term maintenance requirement.
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