What are the options for creating and controlling tension in a zone?
Zone-by-zone, we must select what to control, speed or torque, and whether to run in open-loop or closed-loop mode. Lastly, if we close the tension control loop, which feedback device will be used, a dancer roller or a tension transducer roller.
For each zone, there are two or three decisions:
How will tension be created/modified?
Option 1A – By force (either directly or through torque)
Option 1B – By speed ratio (a.k.a., draw control)
Will the zone have closed-loop control?
Option 2A – Open-loop control with no tension feedback
Option 2B – Closed-loop control with tension feedback
If Option 2B (closed-loop control) – Which feedback will be used?
Option 3A – Load cell roller feedback
Option 3B – Dancer roller feedback
TJWalker + Associates, Inc.
Timothy J. Walker
President / Web Handling Specialist