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Centrifugal Compressor |
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 Jan 8 2009, 03:23 PM
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#1
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Intermediate Member  Group: Full Member Posts: 35 Joined: 27-June 06 From: India, Vadodara Member No.: 1,583  |
Dear All,
I need some urgent help for selecting Softstarter for Centrifugal compressor application. Im attaching the load torque curve of the compressor. http://rapidshare.com/files/181073531/win6...Curve_50_Hz.pdf. Starting time required for the compressor is 5-12 seconds. Motor details are AMbient temp = 45 deg c Motor rating = 410 KW Operating volt = 415 +/- 10%, 3 ph, 50 Hz +/- 3% Full load current = 650 A I have selected Emotron Softstarter of 500kw rating, 710A current with 300% overload for 30 sec. Will this be suitable for this compressor? How do we determine from the load torque curve of compressor, that it can be started with a softstarter? Presently he is using FCMA type starter and want to switch to SCR soft starter. Regards, Anurag |
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Jan 8 2009, 06:04 PM
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#2
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Posting Freak Group: Moderator Posts: 2,336 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello Anurag
First, yes you can use a soft starter to start this compressor, but the start current is a function of the speed/torque curve of the compressor and the speed/torque and speed/current curves of the motor. There are major variations between the start characteristics of motors and the start current variation for a given load can vary by more that 50% depending on the motor. Do you have any data on the motor? I would need this to comment. Without this data, I would allow for a start current of 400 - 450% from my experience. 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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