Using An Analog Signal (Current Input) To Give A Frequency Command - Mitsubishi Electric FR-A820-00046 Instruction Manual

Basic operation procedure (External operation)
4.6.5

Using an analog signal (current input) to give a frequency command

NOTES 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
Fig. 4-11:
Example Operation example: Operate at 60 Hz.
Screen at power-ON
The monitor display appears.
Terminal 4 input selection
Turn ON the terminal 4 input selection signal (AU). Input to the terminal 4 is enabled.
Start
Turn ON the start switch (STF or STR). [FWD] or [REV] flickers as no frequency command is given.
Acceleration ➔ constant speed
Input 20 mA.The frequency value on the indication increases in Pr. 7 "Acceleration time", and "
(60.00 Hz) appears. [FWD] indicator is lit during the forward rotation, and [REV] indicator is lit during the reverse
rotation.
Deceleration
Input 4 mA or less.The frequency value on the indication decreases in Pr. 8 "Deceleration time", and the motor
stops rotating with "
Stop
Turn OFF the start switch (STF or STR). [FWD] or [REV] indicator turns OFF.
Tab. 4-19:
NOTES 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 deceler-
ates to a stop.
Pr. 184 "AU terminal function selection" must be set to "4" (AU signal) (initial value).
Parameters referred to
Pr. 7, Pr. 8
Pr. 184
4 - 28
Forward rotation start
Reverse rotation start
Switch
Current signal
source
(4–20 mA DC)
Frequency setting by analog current input
" (0.00 Hz) displayed. [FWD] or [REV] indicator flickers.
Operate the inverter by using the analog current input
Acceleration time, Deceleration time
AU terminal function selection
Inverter
STF
STR
AU
SD
4(+)
5(-)
Operation
Basic operation
I002447E
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