Inside the delta vs DOL with soft start.
Not too long ago we had a star-delta motor controller blow apart but did not hurt the motor, at least from megging and ohms measurements. I read this forum with enthusiasm and followed your collective advise and asked the boss to order a soft start. He ordered a soft start controller to handle the motor FLA. He also wanted to connect the soft start in "inside the delta" configuration. I said that this was not neccessary since we could DOL with the soft start since it was rated for motor HP. I also told him that engineers at this site generally frowned on that configuration. Now for my question, the motor is a 12 lead motor that was being used in star-delta. I have been installing the soft start and intend to wire the motor to the soft start controller just like it would be if it was connected to M1 and M2 in the old star-delta configuration during run. In that:
Output soft start controller,
Phase 1 tied to T1, T7, T6 and T12.
Phase 2 tied to T2, T8, T4 and T10.
Phase 3 tied to T3, T9, T5 and T11.
That is how the motor was connected to the line when both M1 and M2 are energized and the motor is up to speed and in run. This is a little late in asking but is there anything wrong with my design?