Pid Gain Tuning - Mitsubishi Electric FR-F820-00046 Instruction Manual

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)
• Note that input to the terminal 1 is added to the terminals 2 and 4 inputs. For example when Pr.128 = "20 or 21", the terminal
1 input is considered as a set point and added to the set point of the terminal 2.
• To use terminal 4 and 1 inputs in PID control, set "0" (initial value) to Pr.858 Terminal 4 function assignment and Pr.868
Terminal 1 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 Pr.902 and the maximum frequency becomes
the frequency of Pr.903.
(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 222
Pr.73 Analog input selectionpage 330
Pr.79 Operation mode selectionpage 228
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Pr.290 Monitor negative output selectionpage 297
C2 (Pr.902) to C7 (Pr.905) Frequency setting voltage (current)

5.11.7 PID gain tuning

Changing the PID control manipulated amount and measuring the PID control response enable automatic setting of the
constant optimal for PID control.
PID set point
ON
Normal operation PID operation
selection)page 355
selection)page 312
bias/gainpage 339
Frequency command
during normal operation
Normal operation
5. PARAMETERS
5.11 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
417