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

Page: 198 / 1218

Basic operation procedure (External operation) Basic operation
4 - 28
4.6.5 Setting the frequency using an analog signal (current input)
Connection diagram
NOTES Turn 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).
I002447E_G
Fig. 4-11: Frequency setting by analog current input
Example Operation example: Operate at 60 Hz.
Operation
Turning ON the power of the inverter
The monitor display turns ON.
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] indicator flickers as no frequency command is given.
Acceleration
➔
constant speed
Input 20 mA. The frequency value indicated on the display increases for the time set in Pr. 7 "Acceleration time", and is
fixed at " " (60.00 Hz). [FWD] indicator turns ON during the forward rotation, and [REV] indicator turns ON
during the reverse rotation.
$
Deceleration
Input 4 mA or less. The frequency value indicated on the display decreases for the time set in Pr. 8 "Deceleration time",
and the motor stops rotating at " " (0.00 Hz). [FWD] or [REV] indicator flickers.
%
Stop
Turn OFF the start switch (STF or STR). [FWD] or [REV] indicator turns OFF.
Tab. 4-19: Operate the inverter by using the analog current input
NOTES When both the forward rotation switch (STF) and the reverse rotation switch (STR) are turned ON,
the motor cannot be started. If both are turned ON while the motor is running, the motor deceler-
ates to a stop.
Pr. 184 "AU terminal function selection" must be set to "4" (initial value) (AU signal).
Parameters referred to
Pr. 7, Pr. 8 Acceleration time, Deceleration time => page 5-241
Pr. 184 AU terminal function selection => page 5-439
5(-)
4(+)
STF
STR
PC
AU
Inverter
Current signal
source
(4–20 mA DC)
Reverse rotation start
Switch
Forward rotation start