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A star delta is intended for picking up large initial loads such as conveyors, draft fans, blowers etc. star is initiated to produce high starting torque to start revolutions and when the speed is speed is near 75% motor is set to delta operation. the time you said is not constant, it depends on the load.
if delta is started before the motor reaching 75% of full speed then motor in delta mode can't handle the load and stops with over heated. it cause no problem if you don't initiate delta even after 75, cause the motor runs in star normally but the speed characteristics of star mode is poor.
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∙ 11y ago
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