Mitsubishi Electric FR-D720S SC EC Instruction Manual page 149

Basic settings
Power on → operation mode check
For the initial setting, the inverter operates in the
external operation mode "EXT" when powering
on. Check that the operation command indication
is "EXT".
If not displayed, press the PU/EXT key
to change to the external "EXT" operation mode.
If the operation mode still does not change, set
Pr. 79 to change to the external operation
mode. (Refer to section 5.1.6).
Start
Turn the start switch (STF or STR) on.
When the frequency command is not given,
"RUN" flickers fast.
Acceleration → constant speed
Perform 20mA input. The frequency value on the
indication increases according to Pr. 7
"Acceleration time" until 50.00Hz is displayed.
Deceleration
Perform 4mA input. The frequency value on the
indication decreases according to Pr.8
"Deceleration time" and displays "0.00" (0.00Hz)
when the motor is stopped.
"RUN" flickers fast.
Stop
Turn the start switch STF or STR off.
Fig. 5-29: Operate the inverter by using the analog current input
NOTE
One of Pr. 178 to Pr. 182 "Input terminal function selection" must be set to "4" (AU signal).
(Refer to section 6.9.1.)
Possible faults:
● The motor will not rotate.
– Check that the EXT lamp is lit. The external operation mode is valid when Pr. 79 = 0
(initial value) or 2. Use the PU/EXT key to change into the external operation mode.
– The AU signal must be turned on.
– Check that wiring is correct.
NOTE Change the frequency (0Hz) of the minimum value of potentiometer (at 4mA) by adjusting
the frequency in calibration parameter C5 "Terminal 4 frequency setting bias frequency".
(Refer to section 6.15.3.)
FR-D700 SC EC
Operation
ON
Forward rotation
Reverse rotation
ON
Current signal
source
(0/4–20mA DC)
Current signal
source
(0/4–20mA DC)
Forward rotation
Reverse rotation
OFF
External operation
Display
Flickering
Flickering
Stop
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