
15
Parameters can be used for mechanical adjustment according to applications, useful for the startup and adjustment work
of the system.
Setting and adjusting multiple devices including
controllers were required for dancer control, and it
took much time to start up the system.
• Complex position control of the dancer roll can be achieved by the inverter alone by setting parameters.
•
By setting mechanical specifications, optimum control can be performed according to the system and the application.
• Analog/pulse signal input method is selectable at the discretion of the customer. Input via communication is also
available.
• PID control enables and simplifies complex control using only the inverter.
• Automatic tension PI gain adjustment enables easy startup. (Tension PI gain tuning)
Before Before
After
There was a worry about the compatibility with the
existing system.
Perform setting according to the motor
type and the control method.
The following procedure shows the parameter setting example for the dancer feedback speed control.
Set the value for each parameter according to the control method and the motor type.
(Speed control gain adjustment or offline auto tuning is required according to the control method.)
Basic parameter setting and control method selection
Set the mechanical specifications accord-
ing to application.
*1: For the control method, vector control is recommended. *2: Setting is required for a motor other than a Mitsubishi motor (the SF-PR, SF-JR,
SF-HR, SF-JRCA, SF-HRCA, or SF-V5RU (1500 r/min series) motor).
Mechanical specifications setting
By calculating the winding diameter of the
winding/unwinding shaft, the tension is
always optimized even if it changes along
with the winding diameter change.
Control accuracy improvement by
the winding diameter calculation
The PI gain is automatically adjusted by
tension PI gain tuning. The time required for
gain adjustment can be reduced.
PI gain automatic adjustment
Set the target position, upper limit, and
lower limit values for the dancer roll.
Dancer roll target position setting
The line speed command input method can be selected from the following: analog input
through a terminal (2, 4, 1, 6, etc.), single-phase pulse train input, encoder pulse input, and
input via communication (CC-Link IE Field Network communication, DeviceNet™,
PROFIBUS-DPV0, etc.).
Input method selection for the line speed command,
dancer signal, and actual line speed
Basic setting of the inverter
STEP 1
Set the mechanical specifications.
Basic setting of
mechanical specifications
STEP 2
Select the input method and the input
terminal function for the line speed
command.
Analog/pulse input
method selection
STEP 3
Set parameters to control the dancer
roll and adjust the tension PI gain.
PID control adjustment
(Dancer roll target position,
tension PI gain tuning)
STEP 4
TEST RUN
D: Diameter
n: Motor speed
d: Material thickness
V: Line speed
N: Number of rotations
Z: Reduction ratio
Intermediate
shaft
NamePr.
Winding/unwinding
shaft
1235
1236
1230
645
1247
1243
1244
7
8
394
395
101
393
1231
1252
1255
Maximum winding diameter 1
Minimum winding diameter 1
Winding/unwinding selection
Winding diameter storage selection
Winding diameter change
increment amount limit
Gear ratio numerator (follower side)
Gear ratio denominator (driver side)
Acceleration time
Deceleration time
First acceleration time
for line speed command
First deceleration time
for line speed command
Second deceleration time
for line speed command
Line speed command
acceleration/deceleration reference
Material thickness d1
Dancer lower limit position
Accumulated amount
Pr.Item
Set point
Upper limit
Lower limit
PID action selection
133
131
132
128
Pr.Item
Applied motor
Electronic thermal O/L relay
Motor capacity
Number of motor poles
Rated motor voltage
71
9
80
81
83
Pr.Item
Rated motor frequency
Control method selection*
1
Torque limit input method selection
Encoder rotation direction
Number of encoder pulses
84
800
810
359
369
Pr.Item
Motor inertia (integer)*
2
Motor inertia (exponent)*
2
Encoder option selection
707
724
862
V
d
D
Z
n
N
Before tuning After tuning
Tuning in progress
0 10 20 30 40 50
Time [s]
Dancer roll position [%]
Dancer roll position
fluctuates significantly
Dancer roll position
fluctuates a little
Fluctuation of the dancer roll position
before and after tension PI gain tuning
30
50
70
Dancer roll
upper limit
Pr.131
Dancer roll
lower limit
Pr.132
Dancer roll
target position
Pr.133
Easy startup and adjustment
1
Features
Features
Example of startup procedure
Turn ON the X114 signal for using dancer feedback speed control and the winding diameter calculation function.