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  1. CtrlAltDel

    Chiller Tripping Due to Current Imbalance

    Hi guys, My questions are: How do I know if the contactors used in the motor starter is properly matched to the load? Could an under-rated contactor aggravate the situation of voltage imbalance at the contactor terminals thereby causing yet higher current imbalance to the motor? Let me...
  2. CtrlAltDel

    How do you read contactor nameplate?

    I was called to try and figure out why a contactor in an elevator panel keeps burning out. This was the second time it happened. Although I suspect the contactor was under-rated I want to make sure. I got this on the partially burned nameplate of the sprecher+schuh brand contactor: AC-1... AC-3...

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