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Communication operation and setting
4.19.4 Communication EEPROM write selection (Pr. 342)
⋅ When changing the parameter values frequently, set "1" in Pr. 342 to write them to the RAM. The life of the EEPROM
will be shorter if parameter write is performed frequently with the setting unchanged from "0 (initial value)" (EEPROM
write).
4.19.5 Operation selection at communication error (Pr.502, Pr.779)
When parameter write is performed from PU connector, RS-485 terminal, and communication option connected
to the inverter, parameter’s storage device can be changed from EEPROM + RAM to only RAM. Set this
parameter when frequent parameter changes are required.
Parameter
Number
Name Initial Value
Setting
Range
Description
342
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.
The above parameters can be set when Pr. 160 User group read selection = "0". However, it can be set any time when the communication
option is connected.
(Refer to page 190)
REMARKS
⋅ When Pr. 342 is set to "1" (only RAM write), the new values of the parameters will be cleared at power supply-OFF of the inverter.
Therefore, the parameter values available when power is switched ON again are the values stored in EEPROM previously.
For communication using RS-485 terminals or a communication option, operation at a communication error can
be selected. The operation is active under the Network operation mode.
Parameter
number
Name
Initial
value
Setting
range
Description
502
Stop mode selection at
communication error
0
At error
occurrence
Indication
Fault
output
At error
removal
0
Coasts to
stop
E.SER* Output
Stops
(E.SER)*
1
Decelerates
to stop
E.SER after
stop*
Output after
stop
Stops
(E.SER)*
2
Decelerates
to stop
E.SER after
stop*
Without
output
Restarts
3
Continues
running at
Pr. 779
⎯
Without
output
Operates
normally
779
Operation frequency
during communication
error
9999
0 to 400Hz
Motor runs at the specified frequency at a communication
error.
9999
Motor runs at the frequency used before the
communication error.
* E.OP1 or E.OP2 appears when using a communication option.
The above parameters can be set when Pr. 160 User group read selection = "0." (Refer to page 190.)
...... The specification differs according to the manufacture date. Refer to page 400 and check the SERIAL.