Mitsubishi FR-A800

(A) Application parameters
512
PARAMETERS
• Calibrating set point input
(Example: To enter the set point on terminal 2)
1) Apply the input (for example, 0 V) of set point setting 0% across terminals 2 and 5.
2) Using C2 (Pr.902), enter the frequency (for example, 0 Hz) to be output by the inverter when the deviation is 0%.
3) Using C3 (Pr.902), set the voltage value at 0%.
4) Apply the input (for example, 5 V) of set point setting 100% across terminals 2 and 5.
5) Using Pr.125, enter the frequency (for example, 60 Hz) to be output by the inverter when the deviation is 100%.
6) Using C4 (Pr.903), set the voltage value at 100%.
NOTE
• When the set point is set at Pr.133, the setting frequency of C2 (Pr.902) is equivalent to 0% and the setting frequency of
Pr.125 (Pr.903) is equivalent to 100%.
• Calibrating measured value input
1) Apply the input (for example, 4 mA) of measured value 0% across terminals 4 and 5.
2) Perform calibration by C6 (Pr.904).
3) Apply the input (for example, 20 mA) of measured value 100% across terminals 4 and 5.
4) Perform calibration by C7 (Pr.905).
NOTE
• Set the frequencies set at C5 (Pr.904) and Pr.126 to each of the same values set at C2 (Pr.902) and Pr.125.
• The display unit for analog input can be changed from "%" to "V" or "mA". (Refer to page 417.)
• The figure below shows the results of having performed the calibration above.
Setting multiple PID functions
• When the second PID function is set, two sets of PID functions can be switched for use. The PID setting is selected as
shown in the table below.
 While Pr.155 = "0", the second function is enabled immediately after RT signal turns ON. While Pr.155 = "10", the second function is enabled
only during constant speed operation when RT signal turns ON. (Refer to page 434 for the details.)
Pr.128 setting
(First PID setting)
Pr.753 setting
(Second PID setting)
Pr.155
setting

RT signal
PID setting applied to the
output frequency
"0" or not applied to the frequency "0" or not applied to the frequency Control other than PID control
"0" or not applied to the frequency Applied to the frequency Second PID setting
Applied to the frequency "0" or not applied to the frequency First PID setting
Applied to the frequency Applied to the frequency
0
OFF First PID setting
ON Second PID setting
10  First PID setting
100
0
0
5
(V)
(%)
[Set point setting]
100
0
0
20
(mA)
(%)
[Measured value]
4
60
0
0
100
Deviation (%)
[Manipulated variable]
Manipulated variable (Hz)