Setting The Frequency Using An Analog Signal (Current Input) - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

• Other adjustment methods for the frequency setting voltage gain are the following: adjustment by applying a voltage directly
across terminals 2 and 5, and adjustment using a specified point without applying a voltage across terminals 2 and 5. (Refer
to page 482.)
Parameters referred to
Pr.125 Terminal 2 frequency setting gain
C2 (Pr.902) Terminal 2 frequency setting bias
C4 (Pr.903) Terminal 2 frequency setting
4.6.5 Setting the frequency using an analog signal
(current input)
• 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).
[Connection diagram]
Forward rotation start
Reverse rotation start
Switch
Current signal
source
(4 to 20mADC)
The following shows the procedure to operate at 60 Hz.
Operating procedure
1.
Turning ON the power of the inverter
The operation panel is in the monitor mode.
2.
Selecting the input via terminal 4
Turn ON the Terminal 4 input selection (AU) signal. Input via terminal 4 to the inverter is enabled.
3.
Start
Turn ON the start switch (STF/STR signal). [FWD] or [REV] indicator blinks as no frequency command is given.
4.
Acceleration → constant speed
Input a current of 20 mA to the inverter from the regulator. The frequency value on the monitor increases according
to the setting of Pr.7 Acceleration time, and "
during the forward rotation, and [REV] indicator is ON during the reverse rotation.
5.
Deceleration
Input a current of 4 mA or less. The frequency value on the monitor decreases according to the setting of Pr.8
Deceleration time, the monitor displays "
blinks.
6.
Stop
Turn OFF the start switch (STF/STR signal). [FWD] or [REV] indicator turns OFF.
NOTE
• When both the forward rotation start switch (STF signal) and the reverse rotation start switch (STR signal) are turned 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 (initial value)" (AU signal).
frequencypage 482
frequencypage 482
gainpage 482
Inverter
STF
STR
AU
SD
4(+)
5(-)
" (0.00 Hz), and the motor stops rotating. [FWD] or [REV] indicator
" (60.00 Hz) appears on the monitor. [FWD] indicator is ON
4.6 Basic operation procedure (External operation)
1
2
3
4
5
6
7
8
9
10
157
4. BASIC OPERATION