Dancer Control (Pr. 44, Pr. 45, Pr. 128 To Pr. 134) - Mitsubishi Electric FR-D720S SC EC Instruction Manual

Parameter
6.19.2

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 thespecified position.
Initial
Pr. No. Name
Value
FR-D720S-
008SC to
100SC,
Second
FR-D740-
acceleration/
44
080SC
deceleration
or less
time
FR-D740-
120SC
and 160SC
Second
45
deceleration 9999
time
PID action
128
selection
PID propor-
129
tional
100%
band
PID integral
130
time
PID upper
131
9999
limit
PID lower
132
9999
limit
PID action
133
9999
set point
PID differen-
134
9999
tial time
The above parameters can be set when Pr. 160 = 0.
Pr. 129, Pr. 130, Pr. 133 and Pr. 134 can be set during operation. They can also be set
independently of the operation mode.
FR-D700 SC EC
Setting
Description
Range
5s
This parameter is the acceleration time of the main
0–3600s speed during dancer control. It will not function as
second acceleration/deceleration time.
10s
0–3600s 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
20 PID reverse action Measured value (terminal 4)
PID forward
21
action
40 PID reverse action Addition
0
PID forward
41
action
42 PID reverse action Addition
PID forward
43
action
If the proportional band is narrow (parameter set-
ting is small), the manipulated variable varies
0.1 greatly with a slight change of the measured value.
– Hence, as the proportional band narrows, the
1000% response sensitivity (gain) improves but the stabil-
ity deteriorates, e.g. hunting occurs.
Gain Kp = 1/proportional band
9999 No proportional control
For deviation step input, time (Ti) required for only
0.1 the integral (I) action to provide the same manipu-
– lated variable as that for the proportional (P)
1s
3600s 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
0–100% signal is output. The maximum input (20mA/5V/
10V) of the measured value (terminal 4) is equiva-
lent to 100%.
9999 No function
Minimum value
If the process value falls below the setting range,
0–100% the FDN signal is output. The maximum input
(20mA/5V/10V) of the measured value (terminal 4)
is equivalent to 100%.
9999 No function
0–100% Used to set the set point for PID control.
9999 Always 50%
For deviation ramp input, time (Td) required for
0.01 providing only the manipulated variable for the pro-
– portional (P) action. As the differential time
10s increases, greater response is made to a deviation
change.
9999 No differential control.
Set value (terminal 2 or
Pr. 133)
For dancer control
method: set point (Pr. 133),
fixed measured value
(terminal 4)
main speed (speed
method:
command of the
ratio operation mode)
Special operation
Parameters referred to
59 Remote func-
tion selection
73 Analog input
selection
79 Operation
mode selection
178–182 Input terminal
function selec-
tion
190/192/ Output terminal
197 function selec-
tion)
561 PTC thermi-
stor protection
level
C2 (Pr. 902) Frequency set-
– ting voltage
C7 (Pr. 905) (current) bias/
gain
6 - 255
Refer to
Section
6.5.3
6.15.1
6.17.1
6.9.1
6.9.5
6.7.1
6.15.3