Mitsubishi Electric 800 Series Instruction Manual (Function page 256

• When parameter changing is seldom necessary, setting "2" fixes the operation mode to the External operation mode.
When frequent parameter changing is necessary, setting "0" (initial value) allows the operation mode to be changed easily
to the PU operation mode by pressing the PU/EXT key on the operation panel. After switching to the PU operation mode,
always return to the External operation mode.
• The STF or STR signal is used as a start command. The input voltage or current via terminal 2 or 4, multi-speed setting
signal, or JOG signal is used as a frequency command.
Forward rotation start
Reverse rotation start
Switch
Frequency setting
potentiometer
Potentiometer
 PU operation mode (Pr.79 = "1")
• Select the PU operation mode when giving start and frequency commands by only the key operation of the operation panel.
• When Pr.79 ="1", the inverter starts up in the PU operation mode at power-ON. The mode cannot be changed to other
operation modes.
• When the PU operation mode is selected, the PU operation mode (PU) signal can be output.
For the terminal used for the PU signal, set "10" (positive logic) or "110" (negative logic) in any parameter from Pr.190 to
Pr.196 (Output terminal function selection).
Operation panel
 PU/External combined operation mode 1 (Pr.79 = "3")
• Select the PU/External combined operation mode 1 when giving a frequency command from the operation panel and giving
a start command with the external start switches.
• Set "3" in Pr.79. The mode cannot be changed to other operation modes.
• When the frequency commands are given using the multi-speed setting signals (external signals), they have a higher
priority than the frequency commands given from the PU. When the AU signal is ON, inputting the command signals via
terminal 4 is enabled.
Forward rotation
start
Reverse rotation
start
Switch
 PU/External combined operation mode 2 (Pr.79 = "4")
• Select the PU/External combined operation mode 2 when giving a frequency command from the external potentiometer,
or multi-speed and JOG signals, and giving a start command by key operation of the operation panel.
Inverter
STF
STR
SD
10
2
5
Inverter
Operation panel
STF
STR
SD
11. (D) Operation Command and Frequency Command
11.1 Operation mode selection
11
12
13
14
15
16
17
18
19
20
255