Application examples
204
10.4.2
Dancer feedback speed control with roll diameter
compensation for wire drawing machines
This is useful for winding wire using a wire drawing machine.
The dancer feedback speed control with roll diameter compensation function in the inverter enable high-speed winding for
high-inertia loads.
Requirements for this application
High-speed winding for high-inertia loads and the stability of a dancer roll are required in this application.
Control overview
The wire drawing section pulls the wire at a constant speed to make the wire thinner. Tension of wire to be wound is
maintained constant by the dancer roll. For the winding roller (shaft), the inverter provides dancer feedback speed control to
keep the dancer roll position, achieving constant tension winding. In addition, using the roll diameter compensation function,
the circumferential speed of the winding bobbin is kept constant.
FR-A800-R2R inverters have the following additional functions as compared with the FR-A800 inverter standard models.
Purpose
Feature of inverter
Stability of dancer roll
The inverter minimizes speed fluctuation to prevent sagging and unevenness.
Winding for high-inertia loads
Higher responsivity can be expected under Vector control using encoders (internal response: 300 rad/s).
Cost reduction
A dancer roll controller is included in the inverter.
Additional function
Description
Dancer feedback speed control
function
The winding roller rotation speed is controlled to keep the dancer roll position constant.
Roll diameter compensation function
After the winding roll diameter is calculated, the motor speed is controlled based on data of the
diameter so that circumferential speed of the winding roll are kept constant. This function reduces
hunting in dancer feedback speed control. Roll diameter calculators and PID calculators do not
need to be added externally.
Tension PI gain tuning
By automatically adjusting the tension PI gain for dancer PID control, time required for adjustment
is significantly cut down. Anyone can start the system easily.
Speed control proportional gain
compensation function
Speed control proportional gain can be changed based on the value determined by roll diameter
calculation.
Displacement
gauge
Non-contact
potentiometer
FR-A800-R2R
FR-A800-R2R
Line speed (0 to 10 V)
2
AM
1
JOG
Dancer/tension control selection (X114)
RL
Dancer
signal
Dancer
signal
Dancer position
(0 to ±10 V)
Actual line speed
(single phase)
Line speed setting
(0 to 10V)
Encoder
FR-A800-R2R
FR-A800-R2R
2
2
2
Brake
unit
Brake
resistor
Encoder
Brake
resistor
Brake
resistor
Brake
unit
Brake
unit
Brake
resistor
Brake
unit
For intermediate
roller (reference axis)
For intermediate
roller
For intermediate
roller
For winding roller
FR-A8AP
FR-A8AP
FR-A8AP
FR-A8AP
1
1
SF-
V5RU
Encoder
SF-
V5RU
Encoder
SF-
V5RU
Encoder
SF-
V5RU
Summary of Contents for A800 Plus Series
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