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  1. askoppal

    Contactor getting welded when shifting from Star to Delta

    Hi, PROBLEM When the 10 HP 420V 50Hz motor of my lathe machine gets shifted from Star to Delta all three contactors (Main, Star and Delta) gets welded and it trips my workshop supply altogether. OUR INITIAL ANALYSIS We thought we had a faulty contactor since the machine is too old, So the...

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