Mitsubishi Electric FR-D720S SC EC Instruction Manual page 165

Parameter
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
cancel level
Tab. 6-1: Parameter overview (15)
FR-D700 SC EC
Incre- Initial Setting
ments value range
0.1–1000%
0.1% 100%
9999
0.1–3600s
0.1 s 1s
9999
0–100%
0.1% 9999
9999
0–100%
0.1% 9999
9999
0–100%
0.01% 9999
9999
0.01–10s
0.01s 9999
9999
0–3600s
0.1s 1 s
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 Kp = 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 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.
The inverter stops operation if the
output frequency after PID opera-
tion remains at less than the
Pr. 576 setting for longer than the
time set in Pr. 575.
Without output interruption
function
Set the frequency at which the out-
put interruption processing is per-
formed.
Set the level (Pr. 577 minus
1000%) at which the PID output
interruption function is canceled.
Parameter overview
All
Para- Para-
Para-
meter meter
meter
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clear
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