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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 167

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Pr.
549
Protocol selection
N000
342
Communication EEPROM
N001
write selection
502
Stop mode selection at
N013
communication error
 Communication EEPROM write selection (Pr.342)
• The parameters storage device can be changed from EEPROM and RAM to RAM only for parameter write performed via
the inverter's PU connector. Use this function if parameter settings are changed frequently.
• When it is desired to change the parameter values frequently, set "1" in
the values 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).
NOTE
• Turning OFF the inverter's power supply clears the modified parameter settings when Pr.342 = "1 (write only to RAM)".
Therefore, the parameter values at next power-ON are the values last stored in EEPROM.
• The parameter setting written in RAM cannot be checked on the operation panel. (The values displayed on the operation panel
are the ones stored in EEPROM.)
 Operation selection at a communication error (Pr.502)
• You can select the inverter operation when a communication line error occurs during communication through the PU
connector. The operation is active under the Network operation mode.
• Select the stop operation at the retry count excess (
or at a signal loss detection (
Pr.502
Fault type
setting
0
(initial
value)
Communication
line
1
2
• The following charts show operations when a communication line error occurs.
166
5. PARAMETERS
5.11 (N) Communication operation parameters
Name
Initial value
0
0
0
).
Pr.336, Pr.539
At fault occurrence
Operation
Indication
Output shutoff
"E.PUE"
Output to
decelerate and
"E.PUE"
stop the motor
Setting
range
0
Mitsubishi inverter protocol (computer link)
1
MODBUS RTU protocol
Parameter values written by communication are written to the
0
EEPROM and RAM.
Parameter values written by communication are written to the
1
RAM.
Inverter operation when a
communication error occurs
0
Output shutoff
ALM signal output
Output to decelerate and stop
1
the motor
ALM signal output after stop
Output to decelerate and stop
2
the motor
Pr.342 Communication EEPROM write selection
, enabled only when the Mitsubishi inverter protocol is selected)
Pr.335
Fault (ALM)
Operation
signal
Output stop
ON
status
continues.
ON after stop
OFF
Restart
Description
Inverter operation after a
communication error is
cleared
Output stop status continues.
Output stop status continues.
Restart
At fault removal
Fault (ALM)
Indication
signal
"E.PUE"
remains
ON
displayed.
Normal
OFF
to write

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