Dancer Control (Pr. 44, Pr. 45, Pr. 128 To Pr. 134) - Mitsubishi Electric FR-D700 Instruction Manual

4.20.2 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
PID action set
133 ∗1
point
PID differential
134 ∗1
time
The above parameters can be set when Pr.160 Extended function display selection ="0". (Refer to page 157)
∗1
Pr. 129, Pr. 130, Pr. 133 and Pr.134 can be set during operation. They can also be set independently of the operation mode.
Special operation and frequency control
Initial Value
FR-D740-080 or less
5s
FR-D720S-008 to 100
FR-D740-120 and 160 10s
9999
0
0.1 to 1000%
100%
0.1 to 3600s
1s
9999
9999
9999
0.01 to 10.00s
9999
Setting
Range
This parameter is the acceleration time of the main
0 to 3600s speed during dancer control. It will not function as
second acceleration/deceleration time.
0 to 3600s This parameter is the deceleration time of the main
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)
Set value (terminal 2 or Pr. 133)
PID forward
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
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
Minimum value
If the process value falls below the setting range,
0 to 100% the FDN signal is output. The maximum input
(20mA/5V/10V) of the measured value (terminal 4)
is equivalent to 100%.
9999 No function
0 to 100% Used to set the set point for PID control.
9999 Always 50%
For deviation ramp input, time (Td) required for
providing only the manipulated variable for the
proportional (P) action.
As the differential time increases, greater response
is made to a deviation change.
9999 No differential control.
Description
For dancer control
set point (Pr. 133),
measured value
(terminal 4)
main speed (speed
command of the
operation mode)
215
4