Which method is more accurate?
Closed-loop tension control is generally more accurate because it uses real feedback.
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Closed Loop vs Open Loop Tension Control
The right control method depends on required accuracy, line speed, material sensitivity, and machine cost target.
Open-loop tension control
Open-loop systems estimate output based on settings such as roll diameter, torque, or operator adjustment. They are simpler but cannot directly correct for changing web tension.
Closed-loop tension control
Closed-loop systems use load cells or dancer feedback to measure actual web tension. The controller adjusts output in real time, making it more suitable for precision converting and sensitive materials.
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FAQ
Is open-loop control still useful?
Yes, it can work for simpler unwind or rewind stations where high precision is not required.
Do closed-loop systems need load cells?
Most closed-loop systems use load cells or dancer feedback to measure actual tension.
Contact KRD Automation for a customized solution
We can help choose between manual, open-loop, and closed-loop control.