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Sinamics DCM - EMF spikes

Created by: Maciek Wachowicz at: 10/30/2015 9:14 AM (3 Replies)

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10/30/2015 9:14 AM	Rate (0)
Maciek Wachowicz Posts: 3 Rating: (0)	Hallo, I have few DCM's working as multimotor drives. Each one drives 6 to 12 motors connected in paralel. Speed feedback is from EMF. I noticed EMF spikes which are irregular on all drives. Some Times this spikes trigger fault F60043 EMF for braking operation too high , in another case trigger F60038 (N, A) Overspeed threshold overshot. Does anyone have any idea what is the reason, or how to avoid faults ? It happens witout or with load, with stable low setpoint in negative direction of rotation only (at least only in this case I have this faults). In attachment is trace of EMF with this spike. Regards, Maciek Attachment EMF spike.jpg (329 Downloads)
Maciek Wachowicz Posts: 3 Rating: (0)
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10/30/2015 1:01 PM	Rate (0)
Jeff Casagrande Posts: 1529 Rating: (203)	How long are your cables?
Jeff Casagrande Posts: 1529 Rating: (203)
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10/30/2015 2:08 PM	Rate (0)
Maciek Wachowicz Posts: 3 Rating: (0)	Very long, about 300m. but there are DC output air reactors. All rollertable sections have the same lenght of cables, but this fault happens only on three of them. Some rollertables are driven by old DC Masters, and there is also NO problem, only on 3 of 11 problem occure.
Maciek Wachowicz Posts: 3 Rating: (0)	Last edited by: Maciek Wachowicz at: 10/30/2015 2:09:54 PM
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11/16/2018 11:08 AM	Rate (0)
AutoGen_6494615 Regular Member Joined: 4/18/2017 Last visit: 2/14/2023 Posts: 1 Rating: (0)	Hello, some solution of this problem?

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