7/5/2011 4:44 PM | |
Posts: 7 Rating:
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am waiting for an answer please |
7/5/2011 6:59 PM | |
Joined: 9/27/2006 Last visit: 9/1/2024 Posts: 12282 Rating:
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Hello Mohamed; You raise a very interesting question, that deserves an answer. However, since this is an open forum, where members from all over the world join and participate, and have their own work and sleep schedules to keep, I would suggest more patience on your part. Expecting an answer within half an hour of posting the original question will bring you more grief than good... A drive is a type of motor starter/controller that is used to set a variable speed or torque setpoint on a motor. Direct-starting a motor will accelerate it to its nominal speed and torque, where it will remain until you turn the power off.A soft-starter (or different combnations of start circuits, such as Delta-Y) willextend the initial acceleration ramp time, in order to produce a softer start; but in the end it will reach its nominal speed and torque, and run at that speed for the duration. Only a drive can vary the speed that the motor will be running at, when it is configured and wired properly. What more can it do in your mixing application? Not very much, but it can help you do it in a very precise and efficient manner. Let us start with the following document, that describes basic operations of a Siemens drive, so you can see different how parameters of a drive affect its running: http://www.legacypower.net/Documents/ACDriveInformationPDF/SiemensACDriveEngineeringData.pdf It also discusses different means of controlling the start/stop of a motor, using terminal blocks and networking (Profibus-DP). Also, have a look at this applicatioon example, it resembles what you are trying to do : MICROMASTER 4: PID filling level control with bumpless operating mode changeover hope this helps, Daniel Chartier |
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8/4/2011 4:59 PM | |
Posts: 3 Rating:
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Dear Alan; Thanks so much for the answer, I 'm going to try it in the process. |
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