Operation Mode Selection (Pr. 79) - Mitsubishi Electric FR-A800 Series Beginner's Manual

The simple mode parameters in detail
6.2.7

Operation mode selection (Pr. 79)

Parameter 79 sets the operation mode of the frequency inverter.
You can set it for operation via external signals, via parameter unit (PU mode), a combination of ex-
ternal signals and PU mode or via a network connection.
● Select external operation mode if you want to control the inverter primarily with signals applied
to the control terminals, for example with potentiometers and switches or with a PLC.
● Select PU mode if you want to start the motor and set the speed via the parameter unit or via the
PU connector.
● Select network mode (NET) for operation via RS-485 communication or an optional communica-
tion module.
Parameter 79
0
(initial value)
1
2
3
4
6
7
NOTE You must also set the appropriate parameters to assign signal X12 to an input terminal on the
inverter. See the documentation of your inverter for details.
6 - 6
Description
At power on, the inverter is in the external operation mode. Use the PU/EXT key on the parameter unit to
switch between the External and PU operation mode. (Details of these modes are described in this table
for the settings "1" and "2".)
Operation Mode
PU operation mode
External operation mode
Combined operation mode 1
Combined operation mode 2
Switch-over mode
Switching of PU, External, and NET operation modes can be performed during operation.
External operation mode (Enable/Disable switch-over to the parameter unit mode )
X12 signal ON: Operation mode can be switched to the parameter unit mode
(output stop during external operation)
X12 signal OFF: Operation mode can not be switched to the parameter unit mode
Setting of the output frequency Start signal
With PU
External signal input (e.g.
terminals 2 and 4, JOG,
multi-speed setting etc.)
With PU or external signal input
(e.g. terminal 4, multi-speed
setting)
External signal input (e.g.
terminals 2 and 4, JOG,
multi-speed setting, etc.)
Parameter
FWD or REV key on PU
External signal input
(terminal STF or STR)
External signal input
(terminal STF or STR)
RUN (FWD, REV) key of the PU