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Thread: Auto-Star Delta circuit

  1. #1
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    Auto-Star Delta circuit

    Hi Guys.

    I built an AUTO-STAR DELTA circuit with a Grease Pump. All my 3 Contactors are 400V coils and the 4th contactor for the grease pump has got a 230V coil. The operation should be as follows: As soon as you you start the panel your grease pump should also start as the its coil is wired under the start button and neutral. The problem is that as soon as I switch the main breaker on the 4th contactor(grease pump) gets energized even before I can press the start button. What might be causing this problem members?

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    is your grease pump coil wired on the wrong side of the start button? or maybe its getting feed back from something else. post the wiring diagram

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    Popo (22-May-15)

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    NO and thanks Bergie,the grease pump coil is connected right after the start buttton and I even tried removing it from the bridge(loop) that comes after the start button to coil of the main contactor by connecting it from the gease pump coil to the other side of the start button but it gives the same story. I will attach the wiring diagram.

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    They should both be n/ o contacts

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