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Two Speed Async. Motor, How? |
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 Mar 27 2009, 02:44 PM
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#1
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 Group: Members Posts: 1 Joined: 27-March 09 Member No.: 5,271  |
Need some hints on how to build a two-speed starter.
Am I correct here? : (Fan/440V/12,5A High speed) The wiring of the starter is very much alike star/delta starting; 3 contactors are needed, but 2 O/L relays. Main contactor needs to have an O/L relay for low speed, and during low speed the star contactor will be closed. For high speed I will open the star contactor, and close the "delta" contactor, which also needs an O/L relay. Is it this simple? Only difference would be the 2nd O/L relay - or do i need the 2nd at all? I assume its a single-winding motor. If we have a 2-winding motor, how should I wire this? Jan QUOTE (jan1977 @ Mar 27 2009, 03:42 PM)  Need some hints on how to build a two-speed starter.
Am I correct here? : (Fan/3phase/440V/12,5A High speed) The wiring of the starter is very much alike star/delta starting; 3 contactors are needed, but 2 O/L relays. Main contactor needs to have an O/L relay for low speed, and during low speed the star contactor will be closed. For high speed I will open the star contactor, and close the "delta" contactor, which also needs an O/L relay. Is it this simple? Only difference would be the 2nd O/L relay - or do i need the 2nd at all? I assume its a single-winding motor. If we have a 2-winding motor, how should I wire this? Jan |
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Mar 29 2009, 12:58 AM
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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 jan1977
Welcome to the forum The Dahlander motor can be connected for high speed and low speed where there speeds change by a ratio of two to one, i.e. 4 pole 8 pole. There are several configurations depending on the torque requirements of the motor at the two speeds. In one configuration, the motor is configured as a star - double star with the double star connection at high speed (Main Hi contactor and star contactors closed) and the Main low speed contactor closed for low speed. In another configuration, the motor is wound as a delta double star with low speed in double star and high speed in delta. In this configuration, the Main Low and star contactors are closed for low speed and the main high speed contactor is closed for high speed. You need to know the correct configuration for the motor that you have. 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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Mar 29 2009, 08:36 AM
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#3
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
For more information, see http://www.lmphotonics.com/InductionMotor/...ander_motor.php
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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