Mitsubishi Electric 800 Series, Instruction Manual, Page: 509 / 727

(A) Application parameters
508
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
Initial
value Setting
range
Description
44
F020 Second acceleration/
deceleration time
5 s 0 to 3600 s
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.
45
F021 Second deceleration
time
9999
0 to 3600 s
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.
9999 Pr.44 is the deceleration time.
128
A610
PID action selection
0
0 No PID action
40
PID reverse
action Additive
method: Fixed
For dancer control
41
PID forward
action Additive
method: Fixed
42
PID reverse
action Additive
method: Ratio
43
PID forward
action Additive
method: Ratio
Others Refer to page 488 .
129
A613
PID proportional band
100%
0.1 to
1000%
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
9999 Without proportional band
130
A614
PID integral time
1s
0.1 to 3600 s
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.
9999 Without integral control
131
A601
PID upper limit
9999
0 to 100%
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%.
9999 No function
132
A602
PID lower limit
9999
0 to 100%
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%.
9999 No function
133
A611
PID action set point
9999
0 to 100% Set the set point during PID control.
9999 Input of set point by terminal selected by Pr.609
134
A615
PID differential time
9999
0.01 to 10 s
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.
9999 Without differential control