Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 773 / 1218

Parameters (A) Application parameters
FR-A800 5 - 571
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 5-543.
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