Mitsubishi Electric FR-A700 Instruction Manual page 212

Parameter overview
Parameter
Func-
Name
tion
129 PID proportional 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
release level
Tab. 6-1: Parameter overview (32)
6 - 32
Incre- Initial Setting
ments Value Range
0.1–1000%
0.1% 100%
9999
0.1–3600s
0.1s 1s
9999
0–100%
0.1% 9999
9999
0–100%
0.1% 9999
9999
0–100%
0.01% 9999
9999
0.01–10.00s
0.01s 9999
9999
0–3600s
0.1s 1s
9999
0.01Hz 0Hz 0–400Hz
0.1% 1000% 900–1100%
Description
If the proportional band is narrow
(parameter setting is small), the
manipulated variable varies greatly
with a slight change of the meas-
ured 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
No proportional control.
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.
No integral control.
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 (ter-
minal 4) is equivalent to 100%.
No function
Set the lower limit value.
If the process 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%.
No function
Used to set the set point for PID
control in the PU operation mode.
Terminal 2 input voltage is the set
point.
Time required for only the differ-
ential (D) action to provide the
same manipulated variable as that
for the proportional (P) action. As
the differential time increases,
greater response is made to a
deviation change.
No differential control.
If the output frequency after PID
operation remains lower than the
Pr. 576 setting for longer than the
time set in Pr. 575, the inverter
stops operation.
Without output interruption func-
tion
Set the frequency at which the out-
put interruption processing is per-
formed.
Set the level (Pr. 577 minus
1000%) to release the PID output
interruption function.
Parameter
All
Para- Para-
para-
meter meter
meter
copy clear
Refer
clear
to
page
✔: enabled
—: disabled
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔ 6-488
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔