Soft starting of the motor voltage
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1 Direct-on-line
starting
2 Star-delta starting
3 Soft starting
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With the softstarter, gating control is used to
reduce the motor voltage, which is then, within a
predetermined ramp-up time tSTART raised
to the mains voltage from a settable starting
voltage (USTART). In this way, the smooth
starting and stopping of the motor protects the
mechanical devices connected to it from being
subjected to the load with a jolt, and it prevents
current peaks and therefore voltage dips in the
electrical supply network.
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