Pid Offset Displacement; Tension Feedback Malposition Detection - Mitsubishi Electric A800 Plus Series Function Manual

Tension sensor feedback speed control details
4.5.3

PID offset displacement

Calibrate the zero point of tension feedback.
Pr. Name
424 Dancer / tension sensor
R104 feedback input offset
PID offset displacement (Pr.424, X102 signal)
• When a tension feedback value is in the point which is desired to be set as the zero point, turn ON the Offset displacement
storage input (X102) signal to add an offset to the PID measured value. Then, tension feedback at turning ON of the X102
signal is defined as 0%.
• At the ON edge of the X102 signal, the present input value (-100 to 100%) is written in Pr.424 Dancer / tension sensor
feedback input offset. A value within the range from 400 to 600% is written in Pr.424, considering the measured value of
0% as 500%.
• Measured value (after the offset) = Measured value (before the offset) - Pr.424 (offset value)
NOTE
• The measured value (after the offset) is limited within the range of ± 100%.
4.5.4

Tension feedback malposition detection

Set the following parameters to prevent the motor speed from increasing at zero (0 N) tension feedback caused by a break.
Pr. Name
131
PID upper limit
A601
132
PID lower limit
A602
137 PID upper/lower limit
R163 hysteresis width
425
Break detection waiting time
R160
Tension feedback malposition detection (break detection) (Pr.131,
Pr.132, Pr.425)
• Set the upper limit of tension feedback in Pr.131 PID upper limit. Set the lower limit of tension feedback in Pr.132 PID
lower limit.
• The FUP signal is output when a tension feedback value exceeds the Pr.131 setting. When a value falls below the Pr.132
setting, the FDN signal is output.
• When tension feedback remains higher than the Pr.131 setting or lower than the Pr.132 setting for the time set in Pr.425
Break detection waiting time or longer, the condition is determined as tension feedback malposition (break), and
compensation by PID control becomes 0. The winding diameter at the time of malposition detection is retained.
• When tension feedback malposition (break) is detected, the Break detection (Y231) signal can be output.
• When the following two conditions are both met, PID calculation is resumed.
- The motor is stopped or output is shutoff.
- The start signal is OFF.
108
TENSION SENSOR FEEDBACK SPEED CONTROL
Setting
Initial value
range
500% 400 to 600%
Setting
Initial value
range
400 to 600%
9999
9999
400 to 600%
9999
9999
0 to 100%
9999
9999
0 to 100 s
9999
9999
Description
The offset displacement input value is written.
Description
Set the value for outputting the PID upper limit (FUP)
signal .
No function
Set the value for outputting the PID lower limit (FDN)
signal .
No function
Prevent chattering of the FUP/FDN signals.
No function
Set the time until tension feedback malposition is
determined.
No break detection