Tension sensor feedback speed control details
108
TENSION SENSOR FEEDBACK SPEED CONTROL
4.5.3
PID offset displacement
Calibrate the zero point of tension feedback.
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.
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.
Pr.
Name
Initial value
Setting
range
Description
424
R104
Dancer / tension sensor
feedback input offset
500%
400 to 600%
The offset displacement input value is written.
Pr.
Name
Initial value
Setting
range
Description
131
A601
PID upper limit
9999
400 to 600%
Set the value for outputting the PID upper limit (FUP)
signal .
9999
No function
132
A602
PID lower limit
9999
400 to 600%
Set the value for outputting the PID lower limit (FDN)
signal .
9999
No function
137
R163
PID upper/lower limit
hysteresis width
9999
0 to 100%
Prevent chattering of the FUP/FDN signals.
9999
No function
425
R160
Break detection waiting time
9999
0 to 100 s
Set the time until tension feedback malposition is
determined.
9999
No break detection
Содержание A800 Plus Series
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