Mitsubishi Electric 800 Series Instruction Manual page 91

Basic operation procedure (External operation)
4.3.5
Using an analog signal (current input) to give a
frequency command
POINT POINT
• Switch ON the STF (STR) signal to give a start command.
• Turn ON the AU signal.
• Set Pr.79 Operation mode selection="2" (External operation mode).
[Connection diagram]
Forward rotation start
Reverse rotation start
Switch
Current signal
source
(4 to 20 mADC)
Operation example
Screen at power-ON
1.
The monitor display appears.
Terminal 4 input selection
2.
Turn ON the terminal 4 input selection signal (AU). Input to the terminal 4 is enabled.
Start
3.
Turn ON the start switch (STF or STR). [STF] or [STR] indicator is on.
Acceleration → constant speed
4.
Input 20 mA. The frequency value on the indication increases in Pr.7 Acceleration time, and "60.00 Hz" appears. [FWD]
indicator is on during the forward rotation, and [REV] indicator is on during the reverse rotation.
Deceleration
5.
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. [FWD] or [REV] indicator is OFF.
Stop
6.
Turn OFF the start switch (STF or STR). [STF] or [STR] indicator turns OFF.
NOTE
• When both the forward rotation switch (STF) and the reverse rotation switch (STR) are ON, the motor cannot be started. If
both are turned ON while the inverter is running, the inverter decelerates to a stop.
• Pr.184 AU terminal function selection must be set to "4" (AU signal) (initial value).
Parameters referred to
Pr.7 Acceleration time, Pr.8 Deceleration time
Pr.184 AU terminal function selection
90
BASIC OPERATION
Inverter
STF
STR
AU
SD
4(+)
5(-)
Operate at 60 Hz.
page 269
page 415
Operation