Dancer Control (Pr. 44, Pr. 45, Pr. 128 To Pr. 134) - Mitsubishi Electric FR-E720-0.1K(SC) 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
Special operation and frequency control
Initial Value
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
9999
0
0.1 to 1000%
100%
0.1 to 3600s
1s
0 to 100%
9999
Setting
Description
Range
This parameter is the acceleration time of
the main speed during dancer control. It will
not function as second acceleration/
deceleration time.
the main speed during dancer control. It will
9999
not function as second deceleration time.
0 PID action is not performed
PID reverse
20 Measured value (terminal 4)
action
Set value (terminal 2 or Pr.
PID forward
21 133)
action
Addition
PID reverse
40 method:
action
fixed
Addition
PID forward
41 method:
action
fixed
Addition
PID reverse
42 method:
action
ratio
Addition
PID forward
43 method:
action
ratio
PID reverse
50 Deviation value signal input
action
(L
W
ON
PID forward
51 communication)
action
PID reverse
60 Set point and measured value
action
input (L
PID forward
61 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
9999 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.
9999 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%.
9999 No function
For dancer
control
set point (Pr.
133),
measured value
(terminal 4)
main speed
(speed
command of the
operation mode)
, CC-Link
ORKS
W , CC-Link
ON ORKS
4
253