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VLT ® Soft Starter Pocket Guide 25
Key Benefi ts: What are the key benefi ts 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.