113
Extended parametersExtended parameters
Extended p
a
ramete
r
li
s
t
P
ID
cont
rol
127
PID control
automatic
switchover
freqeuncy
0.01Hz
9999
0 to 400Hz
Set the frequency at which the control is
automatically changed to PID control.
9999
Without PID automatic switchover
function
128
PID action selection
1
10
10
PID reverse action
Deviation value
signal (terminal 1)
11
PID forward action
20
PID reverse action
Measured value
input (terminal 4)
Set value (terminal
2 or Pr. 133)
21
PID forward action
50
PID reverse action
Deviation value
signal input
(LONWORKS, CC-
Link communication)
51
PID forward action
60
PID reverse action
Measured value,
set value input
(LONWORKS, CC-
Link communication)
61
PID forward action
129
PID proportional
band
0.1%
100%
0.1 to 1000%
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 K = 1/proportional band
9999
No proportional control
130
PID integral time
0.1s
1s
0.1 to 3600s
Time 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.
131
PID upper limit
0.1%
9999
0 to 100%
Set the upper limit value.
If the feedback value exceeds the setting, the
FUP signal is output. The maximum input
(20mA/5V/10V) of the measured value
(terminal 4) is equivalent to 100%.
9999
No function
132
PID lower limit
0.1%
9999
0 to 100%
Set the lower limit value.
If the measured value falls below the setting
range, the FDN signal is output.
The maximum input (20mA/5V/10V) of the
measured value (terminal 4) is equivalent to
100%.
9999
No function
133
PID action set point
0.01%
9999
0 to 100% Used to set the set point for PID control.
9999
Terminal 2 input voltage is the set point.
Fu
nc
tio
n
Parameter
Name
Incre
ments
Initial
Value
Range
Description
Param
eter
copy
Param
eter
clear
All
param
eter
clear
Re
la
te
d
p
a
ra
me
te
rs
: enabled
×
: disabled
Summary of Contents for FR-F700 Series
Page 134: ...MEMO ...
