44 | Danfoss Drives · DKDD.PB.551.A1.02
There are three dierent types of soft starter which oer dierent
features and control the motor in dierent ways.
1. Torque controllers control only one phase during start. This
reduces the torque shock at start but does not reduce start
current. Torque controllers must be used in conjunction with a
direct on-line starter.
2. Soft starters which control two phases can reduce start current
as well as eliminating torque transients, and are suitable for
normal and heavy duty loads, but not severe loads. The start
current on the uncontrolled phase is slightly higher than the two
controlled phases.
3. Soft starters which control all three phases provide the
maximum level of soft start control and are the only soft start
solution that is suitable for severe duty applications.
Types of Soft Starter: What are the dierent types
of soft starters?
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