Dancer Control - Mitsubishi Electric FR-A800 Series Instruction Manual

NOTE
• The second PID pre-charge function is valid also when the first pre-charge function is set to invalid and the second pre-charge
function is set.
• When "10" (second function enabled only during constant-speed operation) is set to Pr.155, the second PID function is not
selected even if the RT signal turns ON.

5.14.13 Dancer control

PID control is performed using detected dancer roll position 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
609 PID set point/deviation
A624 input selection
622
5. PARAMETERS
5.14 (A) Application parameters
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Initial value Setting 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
1 s
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
0.01 to 10 s
9999
9999
1
2
2 3
4
5
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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 action Additive method: Fixed
PID forward action Additive method: Fixed
PID reverse action Additive method: Ratio
PID forward action Additive method: Ratio
Refer to page 601.
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
No proportional control
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.
No integral control
Set 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.
No differential control
The set point is input through terminal 1.
The set point is input through terminal 2.
The set point is input through terminal 4.
The set point is input via communication
The set point is input by the PLC function.
For dancer control