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Soft Start, star or delta |
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  Sep 13 2008, 07:11 PM
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#1
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 Group: Members Posts: 1 Joined: 13-September 08 Member No.: 4,808  |
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 |
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Sep 14 2008, 06:31 PM
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#2
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
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 administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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