Mitsubishi Electric A800 Plus Series Function Manual page 75

Dancer feedback speed control details
3.5.9
Dancer roll malposition detection
When a break occurs and the dancer roll falls, dancer feedback speed control is used to prevent the motor speed from
increasing.
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
Dancer roll malposition detection (break detection) (Pr.131, Pr.132, Pr.425)
• Set the upper limit of the dancer roll position in Pr.131 PID upper limit. Set the lower limit of the dancer roll position in
Pr.132 PID lower limit.
• When the dancer roll position goes higher than the position set in Pr.131, the FUP signal is output. When the position goes
lower than the position set in Pr.132, the FDN signal is output.
• When the dancer roll position remains higher than the position set in Pr.131 or lower than the position set in Pr.132 for the
time set in Pr.425 Break detection waiting time or longer, the condition is determined as the dancer roll malposition
(break), and compensation by PID control becomes 0. The winding diameter at the time of malposition detection is
retained.
• When the dancer roll malposition (break) is detected, the Break detection (Y231) signal can be output.
• When the following two conditions are both met, dancer feedback speed control (PID calculation) is resumed.
- The motor is stopped or output is shutoff.
- The start signal is OFF.
• For using each signal, use Pr.190 and Pr.196 (output terminal function selection) to assign the function referring to the
following table.
Output
signal
Positive logic
FDN 14
FUP 15
Y231 231
Normal operation
Line speed command
Start command
Y231
74
DANCER FEEDBACK SPEED CONTROL
Initial value
9999
9999
9999
9999
Pr.190 to Pr.196 setting
Negative logic
114
115
331
Motor speed
Pr.425
(Break detection waiting time)
OFF
Break detection
Setting
range
400 to 600% Set the value for outputting the PID upper limit (FUP) signal.
9999 No function
400 to 600% Set the value for outputting the PID lower limit (FDN) signal.
9999 No function
0 to 100% Set the hysteresis width for the FUP and FDN signals.
9999 No function
0 to 100 s Set the time until the dancer roll malposition is determined.
9999 Break detection disabled
Dancer roll falling to the lower limit
Dancer roll neutral position
Dancer lower limit position (Pr.132)
PID compensation amount = 0
ON
ON
Description
Turns OFF when the
motor stops running and
the start command turns
OFF.
OFF
OFF