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Speed rises after off command

Created by: OMerfayyazzz at: 6/30/2017 2:32 PM (3 Replies)

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6/30/2017 2:32 PM	Rate (0)
OMerfayyazzz Posts: 16 Rating: (0)	Dear Support, We are facing a problem with a DCM. The drives starts normally and has no problem during operation. But when the off command is given, it comes down and at the end its speed rises and then stops. This increase in the speed is causing us serious problems in the process as the re-startup becomes problematic due to sag in the material. this drive is in the polyester line. I have checked the trace of different parameters and found that when the speed again rises in the end, the input of RFG is zero but the RFG output rises. This is not understandable for us as this rise in RFG output causes the motor to run angain slightly. i am attaching the trace snap shorts and the files for help. regards. Attachment PF (1).JPG (223 Downloads)
OMerfayyazzz Posts: 16 Rating: (0)
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6/30/2017 2:38 PM	Rate (0)
Jeff Casagrande Posts: 1529 Rating: (203)	Did you tune the drive? The speed feedback should closely follow the reference. Yours is awful.
Jeff Casagrande Posts: 1529 Rating: (203)
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6/30/2017 2:57 PM	Rate (0)
OMerfayyazzz Posts: 16 Rating: (0)	yes. we optimized the drives. Actually it the first drive in the polyester draw line. There might be a pulling effect from the other drives after this one which cause it to deviate from reference. But when the line stops, this drive moves a little but the reference at the RFG is zero. This confusing. i have attached the Drive backup. Attachment Prefeed_290617.zip (187 Downloads)
OMerfayyazzz Posts: 16 Rating: (0)	Last edited by: OMerfayyazzz at: 6/30/2017 2:59:41 PM Last edited by: OMerfayyazzz at: 6/30/2017 3:13:58 PM
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7/1/2017 3:02 AM	Rate (0)
Jeff Casagrande Posts: 1529 Rating: (203)	Do you have a tension/dancer position loop or some other correction outer loop? That will be after the RFG.
Jeff Casagrande Posts: 1529 Rating: (203)
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