Parameter setting procedure for dancer feedback speed control
48
The following table shows setting examples.
∗2
The reference value for the offset setting is 1000% for the voltage (monitored in percentage) input through terminal 1, and 500% for the
Pr.133
setting. Therefore, 500% is subtracted from the monitored value.
10
PID control action check (example)
Set the dancer roll approximately around the target position.
Input a line speed command of 0 m/min.
Input the X114 signal and start command.
Start the motor without feeding the workpiece.
Change the dancer roll position during motor operation, and check that the following motor speed conditions.
If any inconsistency is found, check the
Pr.128
setting.
11
PID control gain adjustment
Feed the workpiece through the system and adjust the tension PI gain. Refer to
for the tension PI gain
adjustment.
12
Test run
Operate the system starting from the maximum-diameter roll to the minimum-diameter roll and vice versa and
check that no fault is found in the system behavior.
Item
Setting example 1
Setting example 2
Target position setting
method
Setting the target position in the middle between the upper and
lower limits
Setting the target position directly
Parameter setting
Set
Pr.52
= "86" (terminal 1 input voltage monitor in %) and
record the value when the dancer position is at the lower limit
(% at lower limit) and the value when the dancer position is at
the upper limit (% at upper limit).
Set the value obtained from:
Move the dancer roll to the middle
position and monitor the
percentage of the voltage input
through terminal 1. Subtract 500
from the monitored value, and set
the remaining value in
Pr.133
.
Winding/
unwinding
Dancer roll position
Motor speed
Winding
Current position > Target position
Deceleration
Current position < Target position
Acceleration
Unwinding
Current position > Target position
Acceleration
Current position < Target position
Deceleration
Pr.133
=
Upper limit % - Lower limit %
+ % at lower limit - 500%
2
Dancer roll
upper limit
Dancer roll
lower limit
Dancer roll
target position
Pr.133
Lower limit %
Upper limit %
Summary of Contents for A800 Plus Series
Page 240: ...239 MEMO ...
