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Table of Contents◗APPLICATION GUIDEWeb ProductsTENSION CONTROL SYSTEMSPneumatic BrakeElectric BrakePrecise tension control is vital to any web- or stripfedoperation, the product – whether paper, plastics,metal strip, rubber sheet or wire – must be fedunder tension, processed under tension and woundup again under tension.Factors such as poorly wound rolls, elasticity, rolldiameter change and irregularities in web thicknesscause significant variations in web tension.ClosedLoopLoad CellBrakeControlSystemsElectric ClutchPSSome applications require taper tension on windup.Winding begins at relatively high tension, with agradual reduction, or tapering, in tension as the rollbuilds in diameter.At the very least, your tension control systemmust compensate for the change in roll diameter. Forprecise control and high line speeds, it must alsobe capable of measuring and controlling tensionwithin very close tolerances.ClosedLoopLoad CellRewindControlSystemsMMCPneumatic ClutchPSNexen systems are available to control variablespeed motors and pneumatic and electric brakesand clutches.Load Cell Based Tension ControlNexen’s load cell based tension control system is aclosed loop system which senses tension in a web andcompares it to a set point, or desired tension level andautomatically adjusts air pressure to a pneumaticclutch or brake to maintain appropriate web tension.The load cell based system can also control electricclutches and brakes.ClosedLoopLoad CellInternalControlSystemsMMCPneumaticClutchMMCThe load cell based systems also can be used withvariable speed drives to maintain proper tension ininternal tension zones or at the windup stand.• Control accuracy of 1-2 percent –highest of any web control systems• Ideal for use with brakes, drives and clutches• Simple to operate –set the tension leveland let the controller do the rest• Allows remote computer to determinethe tension and set points for each jobOpen Loop Tension ControlThe open loop tension control system electronicallymeasures or estimates the diameter of the unwindor windup roll. It then modulates a brake to controlthe unwind, or a clutch or variable speed drive forwindup applications to maintain tension as thediameter varies. Accuracy is typically about8-10 percent.OpenLoopUnwindBrakeControlSystemsTensionRead OutRewindControlSystemsTROTension Read OutOptical EncoderPneumatic BrakeTRMCUMMCMotor ControllerTension SensorOpenLoopRewindControlSystemsOptical EncoderOutputControl*Electric BrakeProximity SwitchPP*For pneumatic clutch: I to DFor electric clutch: power supplyFor variable-speed motor: motor controlPPSOPPSMProximity SwitchPower SupplyOpen Loop ControlsMotorClosed Loop LoadCell Based ControllerI to P TransducerDancer PositionSensor24
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Table of Contents◗TOOTH CLUTCHES
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Table of Contents◗FRICTION BRAKES
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Table of Contents◗CALIPER BRAKES
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Table of Contents◗SHAFT-END MOUNT
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Table of ContentsPRODUCTSIn accorda
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Table of ContentsWeb ProductsTENSIO
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Table of Contents◗ CLUTCH AND BRA
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Table of ContentsHOLDING:A brake fu
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Table of ContentsHIGH INERTIA START
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Table of ContentsTENSION CONTROL (U
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