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In a star-delta starter what could be the problem if the motor does not rotate in star but rotates in delta?
Wiki User
∙ 14y ago
One of the three phase contacts in the star contactor could be burned open or just open not allowing the motor to start because of a single phase condition. The time interval between star and delta connections could be small enough that the motor heaters will not catch the single phase condition and trip. When the motor goes into delta (which is now across the line starting) all of the three phase contacts in the contactor close and the motor starts.
Wiki User
∙ 14y ago
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