Dancer Roll Position Detection; Pid Offset Displacement - Mitsubishi Electric A800 Plus Series Function Manual

NOTE
• The dancer signal is clamped at ±100%.
• For the details of C3 (Pr.902), C4 (Pr.903), C6 (Pr.904), C7 (Pr.905), C13 (Pr.917), and C15 (Pr.918), refer to the FR-A800
Instruction Manual (Detailed).
Dancer signal input filter (Pr.1227)
• Use Pr.1227 Dancer / tension sensor feedback input filter time constant to set the primary delay filter for the dancer
signal input value. When Pr.1227 = "0", the filter is not set.
3.5.7

Dancer roll position detection

A signal is output while the dancer roll position value maintains the specified normal level.
Pr. Name
423 Dancer / tension sensor
R422 feedback detection level
Dancer roll position detection (Pr.423, Y235 signal)
• The Dancer / tension sensor feedback detection level (Y235) signal is output when the dancer roll, which is viewed from the
target position, is within the range set in Pr.423 Dancer position / tension feedback detection.
• For the Y235 signal, set "235 (positive logic) or 335 (negative logic)" in one of Pr.190 to Pr.196 (output terminal function
selection) to assign the function to the output terminal.
3.5.8

PID offset displacement

Calibrate the zero point of the dancer roll position (PID measured value).
Pr. Name
424 Dancer / tension sensor
R104 feedback input offset
PID offset displacement (Pr.424, X102 signal)
• The PID offset displacement function is used to calibrate the zero point of the dancer roll position (PID measured value).
• When the dancer roll is in a certain position which is desired to be set as the zero point, turn ON the Offset displacement
input (X102) signal to add an offset to the PID measured value. Then, the dancer roll position 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%.
Initial value
10% 0 to 100%
Pr.423
Neutral position
(target position)
Pr.423
Dancer position detection level
Y235 is ON while the dancer roll
stays within this range.
Initial value
500% 400 to 600%
Dancer feedback speed control details
Setting
range
Set the normal position range of the dancer roll. Define
the percentage of deviation with respect to the target
position.
Upper limit
Lower limit
Setting
range
The offset displacement input value is written.
DANCER FEEDBACK SPEED CONTROL
Description
Description
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