Mitsubishi Electric F700 Instruction Manual page 81

Parameter list
Parameter
PID control
automatic
127
switchover
frequency
128
PID action selection
PID proportional
129
band
130
PID integral time
131
PID upper limit
132
PID lower limit
133
PID action set point
76
Incre Initial
Name
ments Value
0.01Hz 9999
1 10
0.1% 100%
0.1s 1s
0.1% 9999
0.1% 9999
0.01% 9999
Range Description
Set the frequency at which the control is
0 to 400Hz
automatically changed to PID control.
Without PID automatic switchover
9999
function
10 PID reverse action
11 PID forward action
20 PID reverse action
21 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 measured value.
0.1 to 1000% 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
Time required for only the integral (I)
action to provide the same manipulated
variable as that for the proportional (P)
0.1 to 3600s
action. As the integral time decreases, the
set point is reached earlier but hunting
occurs more easily.
9999 No integral control.
Set the upper limit value.
If the feedback value exceeds the setting, the
0 to 100% FUP signal is output. The maximum input
(20mA/5V/10V) of the measured value
(terminal 4) is equivalent to 100%.
9999 No function
Set the lower limit value.
If the measured value falls below the setting
range, the FDN signal is output.
0 to 100%
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 Terminal 2 input voltage is the set point.
Param Param
eter eter
copy clear
: enabled
× : disabled
Deviation value
signal (terminal 1)
Measured value
input (terminal 4)
Set value (terminal
2 or Pr. 133)
Deviation value
signal input
(L W , CC-
ON ORKS
Link communication)
Measured value,
set value input
(L W , CC-
ON ORKS
Link communication)
All
param
eter
clear