Mitsubishi Electric 800 Series Instruction Manual (Function page 432

NOTE
• When the set point is set by using Pr.133, the setting frequency of C2 (Pr.902) is equivalent to 0% and the setting frequency
of Pr.125 is equivalent to 100%.
• Measured value input calibration
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 in C5 (Pr.904) and Pr.126 to each of the same values set in C2 (Pr.902) and Pr.125.
• The display unit for analog input can be changed from "%" to "V" or "mA". (Refer to
• The following figure shows the results of having performed the calibration above.
[Set point setting]
(%)
100
0
0 5
*1 The upper limit of the manipulated amount is the Pr.125 setting value.
NOTE
• Even if the X14 signal is ON, PID control is stopped and multi-speed or JOG operation is performed when the multi-speed
operation (RH, RM, RL, or REX) signal or JOG signal (JOG operation) is input.
• PID control is invalid under the following settings.
Pr.79 Operation mode selection = "6" (Switchover mode)
• To use terminal 4 input in PID control, set "0" (initial value) to Pr.858 Terminal 4 function assignment. When a value other
than "0", PID control is invalid.
• Changing the terminal functions with Pr.178 to Pr.189 and Pr.190 to Pr.196 may affect other functions. Set parameters after
confirming the function of each terminal.
• When PID control is selected, the minimum frequency becomes the frequency of C2 (Pr.902) and the maximum frequency
becomes the frequency of Pr.125.
(The Pr.1 Maximum frequency and Pr.2 Minimum frequency settings also are valid.)
• During PID operation, the remote operation function is invalid.
• When control is switched to PID control during normal operation, the frequency during that operation is not carried over, and
the value resulting from PID calculation referenced to 0 Hz becomes the command frequency.
Frequency
command
PID action
Operation when control is switched to PID control during normal operation
Parameters referred to
Pr.59 Remote function selectionpage 240
[Measured value]
(%)
100
0
(V)
0 4
PID set point
ON
Normal operation PID operation
page
Manipulated variable (Hz)
∗1
60
0
0
(mA)
20
Frequency command
during normal operation
Normal operation
358.)
[Manipulated variable]
100 Deviation (%)
16. (A) Application Parameters
16.4 PID control
11
12
13
14
15
16
17
18
19
20
431