Mitsubishi Electric 800 Series, Instruction Manual, Page: 552 / 727

(N) Operation via communication and its settings
PARAMETERS
551
5
GROUP
N
 Waiting time setting from the communication line error occurrence to the
communication error activation (Pr.500)
• When a communication option is used, use Pr.500 Communication error execution waiting time to set the time from
when the communication line error occurs until the inverter starts the operation for the communication error.
• When a communication line error occurs and lasts longer than the time set in Pr.500 , it is recognized as a communication
error. If the communication returns to normal within the time, it is not recognized as a communication error, and the
operation continues.
• Operation from the error occurrence until the Pr.500 setting time elapses

When the communication returns to normal within the time period set in Pr.500 , the protective function (E.OP1) is not activated.
 Displaying and clearing the communication error count (Pr.501)
• When a communication option is used, the cumulative count of communication error occurrences can be displayed. Write
"0" to clear this cumulative count.
• When a communication line error occurs, the setting of Pr.501 Communication error occurrence count display
increases by one.
• The cumulative count of communication error occurrences is counted from 0 to 65535. When the count exceeds 65535, the
displayed value is cleared and the counting starts over from 0 again.
NOTE
• Communication error count is temporarily stored in the RAM memory. The error count is stored in EEPROM only once per
hour. If power reset or inverter reset is performed, Pr.501 setting will be the one that is last stored to EEPROM depending on
the reset timing.

Error reset operation selection at inverter fault (Pr.349)
• An error reset command from a communication option can be invalidated in the External operation mode or the PU
operation mode.
Fault type
Pr.502
setting
Operation Indication Fault output
Communication line
0
Operation
continues.

Normal

Not provided.

1
2
3
4
Communication option
0, 3 Output shutoff "E. 1" Output
1, 2
Output to decelerate
and stop the motor.
"E. 1" after stop Output after stop
4 Operation continues. "CF" warning Not output
Pr.349 setting Description
0 (initial value) Error reset is enabled independently of operation mode.
1 Error reset is enabled in the Network operation mode.
100, 101 For details, refer to page 707 .
Normal
Error
Pr.500
setting time
Normal
Error
Communication line status
Alarm signal(LF)
( Pr.502 = 3)
Recognition
ON
Pr.500
setting time
Communication error
(E.OP1)
Normal Error
Count timing depending on
communication line status
Incremented by 1
Normal Error
Incremented by 1