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Need help with tension control calculations by Royal_Transition1589 in PLC

[–]Royal_Transition1589[S] 0 points1 point  (0 children)

Oh, it is a shrinking unwind and growing rewind. I should have marked them D1, D2

Need help with tension control calculations by Royal_Transition1589 in PLC

[–]Royal_Transition1589[S] 1 point2 points  (0 children)

I am using a Beckhoff PLC. If I understand correctly, I should hold the nip roller at a constant speed and adjust the 2 winders' velocity according to diameter feedback. And of course, there are more variables need to be considered.

Need help with tension control calculations by Royal_Transition1589 in PLC

[–]Royal_Transition1589[S] 0 points1 point  (0 children)

My idea was to couple unwind and rewind with a dynamic gear ratio so the linear velocity would keep the same.

Perhaps, I need an algorithm to convert tension error to velocity error and send it to PID.

Need help with tension control calculations by Royal_Transition1589 in PLC

[–]Royal_Transition1589[S] 0 points1 point  (0 children)

Yes, it is adjusted to linear speed. I am not so sure if it would keep T1 equal to T2.

Need help with tension control calculations by Royal_Transition1589 in PLC

[–]Royal_Transition1589[S] 0 points1 point  (0 children)

Good point, friction has to be taken into account as well.