Setting The Frequency Using An Analog Signal (Current Input) - Mitsubishi Electric 800 Series Instruction Manual

2.5.4 Setting the frequency using an analog signal
(current input)
• Use the RUN key on the operation panel to give a start command.
• Use the current regulator which outputs 4 to 20 mA to give a frequency command (by connecting it across terminals 4 and 5
(current input)).
• Turn ON the AU signal.
• Set Pr.79 Operation mode selection = "4" (External/PU combination operation mode 2).
[Connection diagram]
AU signal
Current signal
source
(4 to 20mADC)
The following shows the procedure to operate at 60 Hz.
Operating procedure
1.
Turning ON the power of the inverter
The operation panel is in the monitor mode.
2.
Changing the operation mode
Set "4" in Pr.79. The PU LED and EXT LED turn ON. (To change the setting, refer to
3.
Assignment of AU signal
Set Pr.180 RL terminal function selection = "4" to assign the AU signal to terminal RL.
4.
Selecting the input via terminal 4
Turn ON the Terminal 4 input selection (AU) signal. Input via terminal 4 to the inverter is enabled.
5.
Start
Press the RUN key. The RUN LED blinks as no frequency command is given.
6.
Acceleration → constant speed
Input a current of 20 mA to the inverter from the regulator. The frequency value on the monitor increases according
to the setting of Pr.7 Acceleration time, and "60.00" (60.00 Hz) appears on the monitor.
7.
Deceleration
Input a current of 4 mA or less. The frequency value on the monitor decreases according to the setting of Pr.8
Deceleration time, "0.00" (0.00 Hz) appears on the monitor, and the motor stops rotating. The RUN LED blinks.
8.
Stop
Press the STOP/RESET key. The RUN LED turns OFF.
NOTE
• The AU signal can be assigned to another terminal. Set "4" in any parameter from Pr.178 to Pr.184 (Input terminal function
selection) to assign the function to an input terminal. (For the Ethernet model, assign the signal to terminal DI0 or DI1 using
Pr.178 or Pr.179.)
• To change the frequency (60 Hz) at the maximum current input (initial value: 20 mA), adjust Pr.126 Terminal 4 frequency
setting gain frequency.
• To change the frequency (0 Hz) at the minimum current input (initial value: 4 mA), adjust the calibration parameter C5
Terminal 4 frequency setting bias frequency.
36
2. Basic Operation
2.5 Basic operation procedure (PU operation)
Inverter
RL(AU)
SD
4(+)
5(ｰ)
Operation panel
page 28.)