Mitsubishi Electric FR-A800, Instruction Manual

Page: 176 / 1042

Basic operation procedure (External operation) Basic operation
4 - 28
4.6.5 Using an analog signal (current input) to give a frequency command
Connection diagram
쑶
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).
I002447E
Fig. 4-11: Frequency setting by analog current input
Example
쑴
Operation example: Operate at 60 Hz.
Operation
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 " " (0.00 Hz) displayed. [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 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 Acceleration time, Deceleration time => page 5-233
Pr. 184 AU terminal function selection => page 5-422
5(-)
4(+)
STF
STR
SD
AU
Inverter
Current signal
source
(4–20 mA DC)
Reverse rotation start
Switch
Forward rotation start