Mitsubishi Electric FR-A720-0.4K Instruction Manual page 379

Special operation and frequency control
<Set point input calibration>
1. Apply the input voltage of 0% set point setting (e.g. 0V) across terminals 2 and 5.
2. Enter in C2 (Pr. 902) the frequency which should be output by the inverter at the deviation of 0% (e.g. 0Hz).
3. In C3 (Pr. 902), set the voltage value at 0%.
4. Apply the voltage of 100% set point (e.g. 5V) across terminals 2 and 5.
5. Enter in Pr. 125 the frequency which should be output by the inverter at the deviation of 100% (e.g. 60Hz).
6. In C4 (Pr. 903), set the voltage value at 100%.
<Measured value calibration>
1. Apply the input current of 0% measured value (e.g. 4mA) across terminals 4 and 5.
2. Make calibration using C6 (Pr. 904).
3. Apply the input current of 100% measured value (e.g. 20mA) across terminals 4 and 5.
4. Make calibration using C7 (Pr. 905).
REMARKS
⋅ The frequency set in C5 (Pr. 904) and Pr. 126 should be the same as set in C2 (Pr. 902) and Pr. 125.
The results of the above calibration are as shown below:
[Set point setting]
(%)
100
0
0
CAUTION
⋅ If the RH, RM, RL, REX signal (multi-speed) or JOG signal (Jog operation) is entered with the X14 signal ON, PID control is
stopped and multi-speed or jog operation is started.
⋅ If the setting is as follows, PID control becomes invalid.
Pr. 79 Operation mode selection = "6" (switchover mode)
⋅ When the Pr. 128 setting is "20" or "21", note that the input across inverter terminals 1 and 5 is added to the set value across
terminals 2-5.
⋅ When using terminal 4 (measured value input) and terminal 1 (deviation input) under PID control, set "0" (initial value) in Pr. 858
Terminal 4 function assignment and "0" (initial value) in Pr. 868 Terminal 1 function assignment. PID control cannot be performed
when a value other than 0 is set.
⋅ Changing the terminal function using any of Pr. 178 to Pr. 189, Pr. 190 to Pr. 196 may affect the other functions. Set parameters
after confirming the function of each terminal.
⋅ When PID control is selected, the minimum frequency is the frequency set in Pr. 902 and the maximum frequency is the
frequency set in Pr. 903. (Pr. 1 Maximum frequency and Pr. 2 Minimum frequency settings are also valid.)
⋅ The remote operation function is invalid during PID operation.
⋅ When the control is switched to PID control during
normal operation, the frequency command value
calculated by PID operation using 0Hz as standard is
used without the frequency during the operation.
♦ Parameters referred to ♦
Pr. 59 Remote function selection
Pr. 73 Analog input selection
Pr. 79 Operation mode selection
Pr. 178 to Pr. 189 (input terminal function selection)
Pr. 190 to Pr. 196 (output terminal function selection)
C2 (Pr. 902) to C7 (Pr. 905) Frequency setting voltage (current) bias/gain
368
[Measured value]
(%)
100
0
(V)
5 0 4
Refer to page 169
Refer to page 286
Refer to page 313
Refer to page 231
Refer to page 239
Manipulated variable (Hz)
60
(mA)
20
Frequency
command
PID action
Normal operation
Operation when control is switched to PID control during normal operation
Refer to page 294
[Manipulated variable]
0
0 100
Deviation (%)
PID set point
Frequency command
during normal operation
ON
PID operation Normal operation