Web guiding: Many processes require material webs whose positions are precisely guided. FMS web guides detect the position of the material with web guide sensors, calculate the deviation from the reference position, and maintain the material at the required position with a steering frame actuator. FMS’s wide range of web tension control and web guiding products offer many possible modular combinations to cover virtually all applications.

Closed loop control
1 The web guide sensor detects the position of the material web.
2 The web guide controller calculates the deviation from the reference position and drives the steering frame actuator accordingly.
3 The steering frame actuator maintains the position of the material web at the reference location, thereby laterally controlling the web material.

Winding/unwinding, slitting, coating, printing and many other production processes require constant material tension.
With current drive solutions, sensor technology, bus systems and amplifiers tension control has become state of the art in converting lines, metal, paper and wire manufacturing and processing. Nowadays, tension measuring load cells are part of the standard equipment in running web production lines.

Closed loop tension control principle
1 Force sensors measure the effective material tension.
2 The tension controller amplifies the measured signal from the force sensor and calculates an output value from the difference between the reference and feedback values.
3 The drive, brake, or clutch converts the output value from the tension controller into a corresponding torque or speed.
4 Constant tension in the process material can be maintained.

Advantages
Defined, adjustable material tension
Reproducible values in physical units (Newtons, Pounds, etc.)
Known manufacturing conditions for finished products (quality recording capability)