Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 199 / 1218

Basic operation Basic operation procedure (External operation)
FR-A800 4 - 29
4.6.6 Changing the frequency (60 Hz, initial value) at the maximum current input
(at 20 mA, initial value)
Change the maximum frequency
Example Operation example:
For a frequency setting potentiometer with 4 to 20 mA input, change the frequency at 20 mA from
60 Hz (initial value) to 50 Hz.
Adjust the setting so that the inverter outputs 50 Hz when 20 mA is input. Set "50 Hz" in Pr. 126.
Operation
Parameter selection
Turn until " " (Pr. 126) appears.
Press to show the present set value (60.00 Hz).
Changing the maximum frequency
Turn to change the set value to " " (50.00 Hz).
Press to enter the setting. " " and " " flicker alternately.
Checking the mode/monitor
Press three times to change to the monitor / frequency monitor.
Start
Turn ON the start switch (STF or STR), then turn the frequency setting potentiometer clockwise slowly to full. (Refer to
steps
and in section 4.6.5.)
The motor is operated at 50 Hz.
Tab. 4-20: Change the frequency of the maximum analog value
NOTES To set the frequency at 4 mA, use the calibration parameter C5.
Other adjustment methods for the frequency setting current gain are the following: adjustment
by applying a current through terminals 4 and 5, and adjustment using a specified point without
applying a current through terminals 4 and 5.
Parameters referred to
Pr. 126 Terminal 4 frequency setting gain frequency => page 5-418
C5 (Pr. 904) Terminal 4 frequency setting bias frequency => page 5-418
C7 (Pr. 905) Terminal 4 frequency setting gain => page 5-418
Frequency setting
signal
Output frequency [Hz]
0
0
0
0 100%
20 mA
5 V
10 V
C7 (Pr. 905)
Gain Pr. 126
Initial value
Bias
60 Hz
(50 Hz)
C5
(Pr. 904)
20
4
1
2
C6 (Pr. 904)