Mitsubishi Electric A800 Plus Series Function Manual page 49

Parameter setting procedure for dancer feedback speed control
The following table shows setting examples.
Item
Target position setting
method
Parameter setting
∗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.
Winding/
unwinding
Winding
Unwinding
11
PID control gain adjustment
Feed the workpiece through the system and adjust the tension PI gain. Refer to
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.
48
DANCER FEEDBACK SPEED CONTROL
Setting example 1
Setting the target position in the middle between the upper and
lower limits
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:
Upper limit % - Lower limit %
Pr.133 =
2
Upper limit %
Dancer roll
target position
Pr.133
Lower limit %
Dancer roll position
Current position > Target position
Current position < Target position
Current position > Target position
Current position < Target position
+ % at lower limit - 500%
Dancer roll
upper limit
Dancer roll
lower limit
Motor speed
Deceleration
Acceleration
Acceleration
Deceleration
Setting example 2
Setting the target position directly
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.
page 57 for the tension PI gain
∗2