beddycor Posted September 13, 2008 Report Share Posted September 13, 2008 I am considering replacing a stare delta starter on a centrifugal fan using a 15 HP motor with a soft start. Having looked at quite a bit of information I am failing to understand how you can obtain the required speed and torque using soft start in the star configuration when you will only have 250V across each motor winding. I can see that the required speed and torque can be obtained in delta mode but this is more complicated and appears to be less populer. Can any one explain? Thanks Link to comment Share on other sites More sharing options...
marke Posted September 14, 2008 Report Share Posted September 14, 2008 Hello beddycor Welcome to the forum. You are correct, you can not develop enough torque in star with a soft starter if the motor is designed to be connected in delta. You must connect the motor in the configuration that it is designed to run in. If you are replacing a star delta starter, then the motor is designed to run in delta, so you permanently connect it in delta and then apply the soft starter. Best regards, Mark. Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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