Controllers are used in conjunction with transducers to control tension in a material web. Depending on the application they can be used to keep tension at the start, during or end of the process. Typically the tension is feed to the controller and in turn the control has a PID loop which controls either a brake or motor to enable a speed change, resulting in increased or decreased tension depending on the setpoint provided.
The DGT300+ is our upgrade for the no longer supported ‘Blue Box’ range of controllers from CMC Controls.
The DGT300+ provides a complete all in one PID controller including:
This powerful unit is perfect for single use applications of tension control and utilises CMC Controls various application software configurations. With our technical support ensuring a correct setup is achieved.
The Unwind position is normally found at the start of the converting line and consists of a free roller and a pneumatic brake or a magnetic clutch / brake.
In this position the controller utilises transducers down stream to acquire tension feedback and adjusts the clutch / brake to increase or reduce tension to match the required tension setpoint.
The intermediate position is typically found in the middle of a converting line and consists of a driven roller controlled by an inverter.
In this position the controller is fed the overall line speed and it can use transducers either up or down stream from its position as tension feedback, the controller will then ensure the driven roller operates at the line speed, plus or minus a trim factor to achieve the required setpoint tension.
The Rewind position is usually found at the end of the converting line and consists of a driven roller controlled by an inverter.
In this position the controller relies on transducers up stream for tension feedback, line speed can be added to ensure accurate tension can be achieved early upon start up and to prevent ‘telescoping’ a diameter sensor can be utilised to feed back into the controller.