Mitsubishi Electric FR-A700 Series Instruction Manual page 112

Parameter
Name
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
134
PID differential time
Output interruption
575
detection time
Output interruption
576
detection level
Output interruption
577
cancel level
Incre Initial
Range
ments Value
Set the frequency at which the control is
0 to 400Hz
automatically changed to PID control.
0.01Hz 9999
9999 Without PID automatic switchover function
10 PID reverse action
11 PID forward action
20 PID reverse action
21 PID forward action
50 PID reverse action
1 10
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. Hence, as the proportional
0.1 to 1000%
0.1% 100% 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
0.1 to 3600s for the proportional (P) action. As the integral
0.1s 1s
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
0.1% 9999
(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,
0 to 100% the FDN signal is output.
0.1% 9999
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.
0.01% 9999
9999 Terminal 2 input voltage is the set point.
Time required for only the differential (D)
action to provide the same manipulated
0.01 to
variable as that for the proportional (P) action.
10.00s
0.01s 9999
As the differential time increases, greater
response is made to a deviation change.
9999 No differential control.
If the output frequency after PID operation
remains lower than the Pr. 576 setting for
0 to 3600s
0.1s 1s longer than the time set in Pr. 575, the
inverter stops operation.
9999 Without output interruption function
Set the frequency at which the output
0.01Hz 0Hz 0 to 400Hz
interruption processing is performed.
Set the level (Pr. 577 minus 1000%) to
0.1% 1000% 900 to 1100%
release the PID output interruption function.
Parameter List
Param
eter
copy
Description
Deviation value
signal (terminal 1)
Measured value
input (terminal 4)
Set value (terminal
2 or Pr. 133)
Deviation value
signal input
(L W , CC-Link
ON ORKS
communication)
Measured value,
set value input
(L W , CC-Link
ON ORKS
communication)
All
Param
param
eter
eter
clear
clear
: enabled
× : disabled
3
107