Mitsubishi Electric A800 Plus Series Function Manual page 104

Parameter setting procedure for tension sensor feedback speed control
9
PID control action setting
Set the following parameters for PID control.
Pr. Name
128 PID action selection
131 PID upper limit
132 PID lower limit
133 PID action set point
∗1 Set the parameter according to the specification of the machine used.
The following table shows a setting example.
Item
Tension command setting method
Parameter setting
10
PID control action check (example)
Apply tension force corresponding to the tension command to the tension sensor.
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 tension 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.
Setting
40 or 41
∗1
∗1
∗1
Setting the tension command directly
Perform calculation to convert the output voltage sent from the tension sensor when an
intended tension command is applied.
Convert the output voltage of the tension sensor to a percentage. Here 5 V corresponds
to 100%.
Set the output voltage value (in %) plus 500% in Pr.133.
Tension feedback
Tension feedback ≥ Tension command
Tension feedback < Tension command
Tension feedback ≥ Tension command
Tension feedback < Tension command
TENSION SENSOR FEEDBACK SPEED CONTROL
Remarks
40: Tension sensor feedback speed control (reverse action)
41: Tension sensor feedback speed control (forward action)
Set the value (0.1% increment) for outputting the PID upper limit
(FUP) signal.
Set the value (0.1% increment) for outputting the PID lower limit
(FDN) signal.
Set the tension command value (0.01% increment).
Setting example
Motor speed
Deceleration
Acceleration
Acceleration
Deceleration
page 104
4
for the tension PI gain
103