Mitsubishi Electric 800 Series Instruction Manual page 341

NOTE
• When the set point is set at Pr.133, the setting frequency of C2 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.
3.
Apply the input (for example, 20 mA) of measured value 100% across terminals 4 and 5.
4.
Perform calibration by C7.
NOTE
• Set the frequencies set at C5 and Pr.126 to each of the same values set at C2 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
*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 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.
Parameters referred to
Pr.59 Remote function selectionpage 165
340
14. (A) Application Parameters
14.4 PID control
(%)
100
0
(V)
5
PID set point
Frequency
command
PID action
Normal operation
Operation when control is switched to PID control during normal operation
[Measured value]
(mA)
0 4 20
Frequency command
during normal operation
ON
PID operation Normal operation
page 273.)
[Manipulated variable]
Manipulated variable (Hz)
∗1
60
0
0 100 Deviation (%)