It does not use a tension detector but increases or decreases the output of powder brake or powder clutch in proportion to the fabric’s length to control the tension.

It is an open loop type semiautomatic tension control device. 

The proximity sensor is installed to detect the number of revolutions of the general roller at the front of winders and unwinders. 
PR-DTC-3000P has a built-in power (SMPS). 

Product Specification