Dancer Control (Pr. 44, Pr. 45, Pr. 128 To Pr. 134) - Mitsubishi Electric FR-E720-008 Instruction Manual

Special operation and frequency control

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
252
Initial Value
FR-E720-175(SC) or less
FR-E740-095(SC) or less
FR-E720S-110 or less
FR-E710W-050 or less
FR-E720-240(SC) and 330(SC)
FR-E740-120(SC) and 170(SC)
FR-E720-470(SC) and 600(SC)
FR-E740-230(SC) and 300(SC)
9999
0
100%
1s
Setting
Range
5s
This parameter is the acceleration time of
the main speed during dancer control. It will
0 to 3600/360s
not function as second acceleration/
10s
deceleration time.
15s
0 to 3600/360s This parameter is the deceleration time of
the main speed during dancer control. It will
9999
not function as second deceleration time.
0 PID action is not performed
PID reverse
20
action
PID forward
21
action
PID reverse
40
action
PID forward
41
action
PID reverse
42
action
PID forward
43
action
PID reverse
50
action
PID forward
51
action
PID reverse
60
action
PID forward
61
action
If the proportional band is narrow
(parameter setting is small), the
manipulated variable varies greatly with a
slight change of the measured value.
0.1 to 1000%
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
0.1 to 3600s
the proportional (P) action. As the integral
time decreases, the set point is reached
earlier but hunting occurs more easily.
9999 No integral control.
Description
Measured value (terminal 4)
Set value (terminal 2 or Pr.
133)
Addition
method: For dancer
fixed control
Addition set point (Pr.
method: 133),
fixed measured value
Addition (terminal 4)
method: main speed
ratio (speed
Addition command of the
method: operation mode)
ratio
Deviation value signal input
(L W , CC-Link
ON ORKS
communication)
Set point and measured value
input (L W , CC-Link
ON ORKS
communication)