Mitsubishi Electric FR-A800, Instruction Manual

Page: 786 / 1042

(N) Operation via communication and its settings Parameters
5 - 606
5.15.3 Initial setting of operation via communication
Set the action when the inverter is performing operation via communication.
●
Set the communication protocol. (Mitsubishi inverter protocol/MODBUS RTU protocol)
●
Set the action at fault occurrence or at writing of parameters
In communication by the communication option, E.OP1 is displayed.
Setting the communication protocol (Pr. 549)
●
Select the communication protocol.
●
The MODBUS RTU protocol can be used by communication from the RS-485 terminals.
Communication EEPROM write selection (Pr. 342)
●
When parameter write is performed via the inverter PU connector, RS-485 terminal, USB commu-
nication, or a communication option, the parameters storage device can be changed from
RAM to RAM only. Use this function if parameter settings are changed frequently.
●
When changing the parameter values frequently, set "1" in Pr. 342 "Communication EEPROM write
selection" to write them to the RAM only. The life of the EEPROM will be shorter if parameter write
is performed frequently with the setting unchanged from "0 (initial value)" (EEPROM write).
Pr. Name
Initial
value
Setting
range
Description
549
N000
Protocol selection 0
0 Mitsubishi inverter protocol (computer link)
1 MODBUS RTU protocol
342
N001
Communication EEPROM
write selection
0
0
Parameter values written by communication are
written to the EEPROM and RAM.
1
Parameter values written by communication are
written to the RAM.
502
N013
Stop mode selection at
communication error
0
0
At fault occurrence At fault removal
Coasts to stop
E.SER display
ALM signal output
Stays stopped
(E.SER display
)
1
Deceleration stop
E.SER display after stop
ALM signal output after
stop
Stays stopped
(E.SER display
)
2
Deceleration stop
E.SER display after stop
Automatic restart
function
3
Operation continued at
the set frequency of
Pr. 779
Normal operation
779
N014
Operation frequency
during communication
error
9999
0 to 590 Hz
Set the frequency to be run at a communication error
occurrence.
9999
The motor runs at the frequency used before the
communication error.
Pr. 549 setting Communication protocol
0(initial value) Mitsubishi inverter protocol (computer link)
1 MODBUS RTU protocol
Tab. 5-266: Protocol selection