5.1. Introduction

In some special cases, it is not convenient to mount tension sensor or the requirement of the precision of tension is not very high. In these cases, the TC818 could be configured as diameter tension controller.

To run TC818 as a diameter tension controller, scroll to Function[28] and choose Radius control, as the following figure illustrates.

The highlights of the diameter tension control system:

• Do not need to mount tension sensors.

• The mechanism is much simpler and the mounting is much easier.

• The taper tension control can be accomplished conveniently.

This function is especially suitable for winding and material splitting machines in printing, packaging, printing and dyeing industries, etc.

The TC818 continuously monitors the pulses on the main roller and material tube, then use these data to calculate the radius of the material tube. Using the tube radius, setting value, rated torque[38] of the powder brake and the built-in algorithm, the controller regulates the output to accomplish the control of the web tension.