Mitsubishi Electric FR-A820-00046 Instruction Manual page 476

(D) Operation command and frequency command
Start command
input method
PU
(FWD/REV key)
Communication
(RS-485
terminals)
Communication
(Communication
option)
Tab. 5-102: Flowchart for selecting the operation mode (2)
External operation mode (Pr. 79 = "0" (initial value), "2")
● Select the External operation mode when the start command and the frequency command are
applied from a frequency setting potentiometer, start switch, etc. which are provided externally
and connected to the control circuit terminals of the inverter.
● Generally, parameter change cannot be performed from the operation panel in the External
operation mode. (Some parameters can be changed. Refer to Pr. 77 "Parameter write selection"
page 5-211.)
● When Pr. 79 = "0 or 2", the inverter starts up in the External operation mode at power-ON. (When
using the Network operation mode, refer to page 5-280.)
● 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 of the operation
panel. After switching to the PU operation mode, always return to the External operation mode.
● The STF and STR signal are used as a start command, and the voltage to terminal 2 and 4, current
signal, multi-speed signal, and JOG signal are used as a frequency command.
5 - 274
Frequency setting
Terminal wiring
method
External (terminal 2
Terminal 2 and 4 (analog)
and 4, JOG,
RL, RM, RH, JOG, etc.
multi-speed, etc.)
⎯
PU (digital setting)
Communication
(RS-485 terminals/
N/A
communication
option)
RS-485 terminals
External (terminal 2
(Refer to page 5-622.)
and 4, JOG, multi-
Terminal 2 and 4 (analog)
speed, etc.)
RL, RM, RH, JOG, etc.
PU (digital setting) N/A
Communication RS-485 terminals
RS-485 terminals (Refer to page 5-622.)
Terminals for
communication option
(Refer to the Instruction
External (terminal 2
Manual of the
and 4, JOG, multi-
communication option.)
speed, etc.)
Terminal 2 and 4 (analog)
RL, RM, RH, JOG, etc.
PU (digital setting) N/A
Terminals for
Communication communication option
(communication
(Refer to the Instruction
option)
Manual of the
communication option.)
Parameter setting Operation method
Frequency setting
Pr. 79 = "4"
Frequency setting
(External/PU
terminal ON
combined
Start command
operation 2)
FWD/REV key ON
Frequency setting
Pr. 79 = "1"
Digital setting
(PU operation
Start command
mode fixed)
FWD/REV key ON
Frequency setting
Frequency setting
Pr. 339 = "1"
terminal ON
Pr. 340 = "1, 2"
Start command
Transmit a start command
via communication
Frequency setting
Transmit a frequency
command via
Pr. 340 = "1, 2" communication.
Start command
Transmit a start command
via communication
Frequency setting
Frequency setting
Pr. 339 = "1"
terminal ON
Pr. 340 = "1" Start command
Transmit a start command
via communication
Frequency setting
Transmit a frequency
command via
Pr. 340 = "1" communication.
Start command
Transmit a start command
via communication
Parameters