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1) Check Overload setting of the starter.
2) Delta Connection is not proper. First check R1-R2,Y1-Y2,B1-B-2. Then make it delta by shorting R1-B2 in "R" Phase,Y1-R2 in "Y" Phase & B1-Y2 in "B" Phase or make proper delta. Motor must be started in Stat as well as Delta..
