Inverters-FREQROL-A800 Plus Series -FREQROL-A800 Plus for Roll to Roll- Wide range of applications
Wide range of applications 
The FR-A800-R2R inverter offers four types of control functions which enable the use in various system applications such as winding/unwinding in the wire drawing machines and printers.
During dancer feedback speed control, speed is controlled for keeping a constant tension on the workpiece (winding/unwinding shaft) by using the dancer roll position and line speed data.
Further stable speed control is possible by performing PID control and winding diameter calculation in the inverter.
Tension sensor feedback speed control is a control function to keep the tension constant using feedback from the tension sensor, instead of the dancer roll position.
Example of dancer feedback speed control
Wire drawing machine
Dancer feedback speed control
The control function is useful for winding in the wire drawing machine. High-speed winding is offered for high-inertia loads.
The wire drawing section pulls the wire at a constant speed to make the wire thinner. For the winding shaft, the inverter provides dancer feedback speed control to keep the dancer roll position, achieving constant tension winding.
In addition, using the winding diameter calculation function, the circumferential speed of the winding reel is kept constant.
Some systems require peripheral devices such as regenerative options.
- 1 Inverter FR-A800-R2R（with the FR-A8AP *1 installed）
- 2 Inverter FR-A800-R2R
（with the FR-A8AP *1 、and FR-A8AZ *2 installed） - 3 Encoder-equipped motor SF-PR-SC
- 4 Dancer roll
- 5 Speed detector
The products in the parentheses are plug-in options.
- *1 Used for vector control.
- *2 Used for the line speed output.
■ Relevant functions
Dancer feedback speed control
A B D
The unwinding shaft rotation speed is controlled to keep the dancer roll position constant. The wire tension is kept constant.
Winding diameter calculation function D
The circumferential speed of the winding shaft is kept constant by calculating the winding diameter of the winding shaft. Hunting can be reduced in dancer roll control.
Initial winding diameter calculation D
The present winding diameter is calculated based on the dancer roll movement at a start from the lower limit position to the target position.
Speed control proportional gain
compensation D
By adjusting the speed control proportional gain according to the winding diameter, the response level can be kept constant.
Tension PI gain tuning
A B D
By automatically adjusting the tension PI gain, time required for adjustment is significantly cut down. Anyone can start the system easily.
