Dancer Control With Winding Diameter Compensation For Wiredrawing Machine - Mitsubishi Electric FR-A700-A1 Instruction Manual

Dancer control function/tension control function
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Dancer control with winding diameter
compensation for wiredrawing machine
5.2 Dancer control with winding diameter compensation for wiredrawing
machine
Dancer control is useful for winding movement in wiredrawing machine.
High speed winding under high load inertia is enabled by embedded dancer control with winding diameter compensation.
(1)
Feature
For a system like this, it is important to wind fast under high load inertia by keeping the position of dancer roll constant.
Purpose
Steadiness of dancer roll
Winding under high load inertia
Cost reduction
(2)
Outline
In a wiredrawing section, a wire is pulled at constant speed to be thinner. The wire is then winded with constant tension, which
is regulated by dancer roll. For the winding shaft, dancer control of FR-A700-A1 series is used to keep the position of dancer
roll and the tension constant. Rim speed of winding bobbin is also kept constant by winding diameter compensation function.
The following functions are added to FR-A700-A1 series, compared to FR-A700 series.
Additional Function
Dancer control function
Winding diameter compensation
function
Encoder
SF-V5RU
FR-A700-A1
2
FR-A7AP
Main
1
speed
setting
(0 to 10V)
Encoder
Brake unit
Brake
resistor
70
Low percentage of speed fluctuation
Speed response level (internal response is 300rad/s) when vector control with encoder is
used.
Dancer roll controller is embedded.
Controls the speed of wind-up shaft to keep the position of dancer roll steady.
Controls the rotation speed of the motor to keep the rim speed constant by calculating the
diameter of the wind-up shaft. By using winding diameter compensation, hunting of dancer
control can be suppressed. Winding diameter compensation and PID calculator are not
necessary.
Dancer
Dancer
signal
signal
Encoder
SF-V5RU
SF-V5RU
FR-A700-A1
FR-A700
2
2
FR-A7AP
FR-A7AP
FR-A7AZ
1
DA1
Brake unit
Brake unit
Brake
Brake
resistor
resistor
Feature
Description
Deviation
Encoder
sensor
No-contact
potentiometer
Dancer/tension control selection (X83)
Reference shaft
SF-V5RU
Line speed
(single-phase
FR-A700-A1
pulse)
JOG
Dancer position
(0 to 10V)
1
FR-A7AP
RL
Main speed (0 to 10V)
2
Winding
shaft
Brake unit
Brake
resistor
Encoder

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