Electrical and Control Systems

Mastering Electrical, Process Measurement & Control Systems

Home » Starters

Tag: Starters

  • How solid-state soft starting of Induction motors is done

    —

    by

    John Mulindi
    in

    Solid-state soft starting is the most commonly used technique for starting induction motors. It provides a smooth build-up of current and torque; the maximum current and acceleration time are easily adjusted. The only problem with this technique over conventional starters is that the mains currents during run-up aren’t sinusoidal, which can lead to interference with…

  • Direct-on-line (DOL) Starter

    —

    by

    John Mulindi
    in

    Let’s consider an illustration of a typical three-phase direct-on-line (DOL) starter below: When the start button is pressed, the 415V contactor coil is energized, the main and auxiliary contacts close, and the motor starts. The auxiliary contact in parallel with the start button holds the coil on. Overload or overcurrent protection is provided by either…