Dancer Control (Pr. 44, Pr. 45, Pr. 128 To Pr. 134) - Mitsubishi Electric FR-E720-600 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
FR-E720-175 or less
5s
FR-E740-095 or less
FR-E720-240 and 330 0 to 3600/360s
10s
FR-E740-120 and 170
FR-E720-470 and 600 15s
0 to 3600/360s This parameter is the deceleration time of the main
9999
0
0.1 to 1000%
100%
0.1 to 3600s
1s
9999
Setting
Range
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
9999
second deceleration time.
0 PID action is not performed
PID reverse
20
action Measured value (terminal 4)
PID forward Set value (terminal 2 or Pr. 133)
21
action
PID reverse Addition
40
action method: fixed
PID forward Addition
41
action method: fixed
PID reverse Addition
42
action method: ratio
PID forward Addition
43
action method: ratio
PID reverse
50 Deviation value signal input
action
(L
PID forward
51 communication)
action
PID reverse
60 Set point and measured value input
action
(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
For deviation step input, time (Ti) required for only
the integral (I) action to provide the same
manipulated variable as that for 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
0 to 100% signal is output. The maximum input (20mA/5V/
10V) of the measured value (terminal 4) is
equivalent to 100%.
9999 No function
Description
For dancer control
set point (Pr. 133),
measured value
(terminal 4)
main speed (speed
command of the
operation mode)
W , CC-Link
ON ORKS
W , CC-Link
ON ORKS
241
4