Mitsubishi Electric FR-A700 Technical Manual page 377

2.20.5 Dancer control [Pr.44, 45, 128 to 134]
Performs PID control by feedback of the position detection of the dancer roller, controlling the dancer roller is in the specified
position.
[Pr.] Name
3.7K or
less
Second
5.5K,
44 acceleration/
7.5K
deceleration time
11K,
15K
Second
45
deceleration time
PID action
128
selection
PID proportional
129 *1
band
130 PID integral time
*1
131 PID upper limit
132 PID lower limit
PID action set
133 *1
point
Initial Setting
Value Range
5s E700
0 to 3600/ This parameter is the acceleration time of the main speed during
10s
0 to 360s dancer control. It will not function as second acceleration/
deceleration time.
D700
15s
0 to 3600s
E700
0 to 3600/
0 to 360s This parameter is the deceleration time of the main speed during
9999
dancer control. It will not function as second deceleration time.
D700
0 to 3600s
9999
0 PID action is not performed
20 PID reverse action
21 PID forward action
40 PID reverse action
41 PID forward action
0
42 PID reverse action
43 PID forward action
50 PID reverse action
51 PID forward action
60 PID reverse action
61 PID forward action
If the proportional band is narrow (parameter setting is small), the
manipulated variable varies greatly with a slight change of the
0.1 to
measured value. Hence, as the proportional band narrows, the
100% 1000%
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
0.1 to (I) action to provide the same manipulated variable as the
1s 3600s 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.
0 to 100%
9999 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, the FDN signal is
0 to 100%
9999 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
9999 Always 50%
E700 D700
Description
Measured value (terminal 4)
Set value (terminal 2 or [Pr. 133])
Addition method: fixed For dancer control
Addition method: fixed
Addition method: ratio
Addition method: ratio
Deviation value signal input (L
Link communication)
Set point and measured value input
(L W , CC-Link communication)
ON ORKS
411
PARAMETER
Available
Inverters
E700
set point [Pr. 133],
measured value
(terminal 4)
main speed (speed
command of the
operation mode)
W , CC-
ON ORKS
D700
2
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