Importance

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Abstract

A soft starter device generates an output voltage of variable amplitude, frequency and phase. An output switch connects the soft starter device to a motor. A bypass switch connects the motor to a line voltage. A controller is configured operate the soft starter device to generate an output voltage that is synchronized with the line voltage. The bypass or output switch may be activated to open or close at an activation time, and a delay time between the activation time and a contact time when the switch opens or closes may be measured. The measured delay time may be utilized to update a value of a representative delay time for the switch. The representative delay time may be utilized to predict a contact time for the switch, or to select an activation time based on a target contact time for opening or closing the switch.

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First Claim