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Generally speaking, there are two types of tension control systems to choose from (see last week's tech tip). Open loop and closed loop.
Open loop tension controls control torque of a drive, brake or clutch to compensate for roll radius changes at an unwind or rewind. As roll radius decreases at an unwind station, open loop controls sense that change and decrease torque at a linear rate. Conversely they increase torque at a rewind. Open loop controls include follower arm, roll radius calculators (based on RPM) and ultrasound.
Closed loop tension controls control torque of a drive, brake or clutch by measuring actual web tension. They include dancer roll assemblies and load cell tension controls.
Generally speaking open loop controls are very stable but not as accurate as closed loop systems. Closed loop tension controls are extremely accurate, but not as stable as closed loop.
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