Mitsubishi Electric 800 Series Instruction Manual page 86

4.2.4
Using an analog signal (current input) to give a
frequency command
POINT POINT
• Use the operation panel (
• Use the outputs from the current signal source (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]
Operation example Operate at 60 Hz.
Screen at power-ON
1.
The monitor display appears.
Changing the operation mode
2.
Set "4" in
Pr.79. [PU+E] indicator is on.
Terminal 4 input selection
3.
Turn ON the terminal 4 input selection signal (AU). Input to the terminal 4 is enabled.
Start
4.
Press or
Acceleration → constant speed
5.
Input 20 mA. The frequency value on the indication increases in Pr.7 Acceleration time, and "60.00 Hz" appears.
Deceleration
6.
Input 4 mA or less. The frequency value on the indication decreases in Pr.8 Deceleration time, and the motor stops rotating
with "0.00 Hz" displayed.
Stop
7.
Press . [FWD] or [REV] indicator turns OFF.
NOTE
• Pr.184 AU terminal function selection must be set to "4" (AU signal) (initial value).
• 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 Pr.904 Terminal 4 frequency
setting bias frequency.
Parameters referred to
Pr.7 Acceleration time, Pr.8 Deceleration time
Pr.79 Operation mode selection
Pr.126 Terminal 4 frequency setting gain frequency
Pr.184 AU terminal function selection?
Pr.904 Terminal 4 frequency setting bias frequency
or ) to give a start command.
AU
AU signal
SD
Current signal
4(+)
source
5(-)
(4 to 20mADC)
. [FWD] or [REV] indicator is on.
page 269
page 291
page 402
page 415
page 402
Basic operation procedure (PU operation)
Inverter
Operation panel
Operation
BASIC OPERATION
4
85