Dancer Control (Pr. 44, Pr. 45, Pr. 128 To Pr. 134) - Mitsubishi Electric FR-E720-0.1 K Instruction Manual

4.21.2 Dancer control (Pr. 44, Pr. 45, Pr. 128 to Pr. 134)

Performs PID control by feedbacking the position detection of the dancer roller, controlling the dancer roller is in the
specified position.
Parameter
Name
Number
Second
44 acceleration/
deceleration time
Second
45
deceleration time
PID action
128
selection
PID proportional
129 ∗1
band
130 ∗1
PID integral time
131 PID upper limit
132 PID lower limit
Special operation and frequency control
Setting
Initial Value
Range
3.7K or less 5s
5.5K, 7.5K 10s
0 to 3600/360s
11K, 15K 15s
0 to 3600/360s This parameter is the deceleration time of the main
9999
9999
0
20
21
40
41
42
0
43
50
51
60
61
0.1 to 1000%
100%
9999
0.1 to 3600s
1s
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
Description
This parameter is the acceleration time of the main
speed during dancer control. It will not function as
second acceleration/deceleration time.
speed during dancer control. It will not function as
second deceleration time.
PID action is not performed
PID reverse
action Measured value (terminal 4)
PID forward Set value (terminal 2 or Pr. 133)
action
PID reverse Addition
For dancer control
action method: fixed
set point (Pr. 133),
PID forward Addition
measured value
action method: fixed
(terminal 4)
PID reverse Addition
main speed (speed
action method: ratio
command of the
PID forward Addition
operation mode)
action method: ratio
PID reverse
Deviation value signal input
action
(L W , CC-Link
ON ORKS
PID forward
communication)
action
PID reverse
Set point and measured value input
action
(L W , CC-Link
ON ORKS
PID forward
communication)
action
If the proportional band is narrow (parameter
setting is small), the manipulated variable varies
greatly with a slight change of the measured value.
Hence, as the proportional band narrows, the
response sensitivity (gain) improves but the
stability deteriorates, e.g. hunting occurs. Gain Kp
= 1/proportional band
No proportional control
When deviation step is input, time (Ti) is the time
required for integral (I) action to provide the same
manipulated variable as the proportional (P) action.
As the integral time decreases, the set point is
reached earlier but hunting occurs more easily.
No integral control.
Maximum value
If the feedback value exceeds the setting, the FUP
signal is output. The maximum input (20mA/5V/
10V) of the measured value (terminal 4) is
equivalent to 100%.
No function
Minimum value
If the process value falls below the setting range,
the FDN signal is output. The maximum input
(20mA/5V/10V) of the measured value (terminal 4)
is equivalent to 100%.
No function
4
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