Dancer Control - Mitsubishi Electric 800 Series Instruction Manual

(A) Application parameters
5.14.13

Dancer control

PID control is performed using the detected dancer roll positions as feedback data. The dancer roll is controlled to be at
a designated position.
Pr. Name
44 Second acceleration/
F020 deceleration time
45 Second deceleration
F021 time
128
PID action selection
A610
129
PID proportional band
A613
130
PID integral time
A614
131
PID upper limit
A601
132
PID lower limit
A602
133
PID action set point
A611
134
PID differential time
A615
508
PARAMETERS
Initial Setting
value range
5 s 0 to 3600 s
0 to 3600 s
9999
9999
0
40
41
0
42
43
Others
0.1 to
1000%
100%
9999
0.1 to 3600 s
1s
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
0.01 to 10 s
9999
9999
Description
Set the acceleration/deceleration time during dancer control.
In dancer control, this parameter becomes the acceleration/
deceleration time of the main speed.
This setting does not operate as the second acceleration/
deceleration time.
Set the deceleration time during dancer control.
In dancer control, this parameter becomes the deceleration time
of the main speed.
This setting does not operate as the second deceleration time.
Pr.44 is the deceleration time.
No PID action
PID reverse Additive
action method: Fixed
PID forward Additive
action method: Fixed
PID reverse Additive
action method: Ratio
PID forward Additive
action method: Ratio
Refer to page 488.
If a narrow proportional band is set (small parameter setting
value), the manipulated amount changes considerably by slight
changes in the measured value.
As a result, response improves as the proportional band
becomes narrower, though stability worsens as shown by the
occurrence of hunting.
Gain Kp=1/proportional band
Without proportional band
With deviation step input, this is the time (Ti) used for obtaining
the same manipulated amount as proportional band (P) by only
integral (I) action.
Arrival to the set point becomes quicker the shorter an integral
time is set, though hunting is more likely to occur.
Without integral control
Sets the upper limit.
The FUP signal is output when the feedback value exceeds this
setting.
The maximum input (20 mA/5 V/10 V) of the measured value
(terminal 4) is equivalent to 100%.
No function
Set the lower limit.
The FDN signal is output when the measured value (terminal 4)
falls below the setting range.
The maximum input (20 mA/5 V/10 V) of the measured value is
equivalent to 100%.
No function
Set the set point during PID control.
Input of set point by terminal selected by Pr.609
With deviation ramp input, this is the time (Td) used for
obtaining the manipulated amount only by proportional action
(P).
Response to changes in deviation increase greatly as the
differential time increases.
Without differential control
For dancer control