Mitsubishi Electric 800 Series Instruction Manual page 165

CAUTION
• When Pr.502 = "6" and a communication line error (PU disconnection, Ethernet communication fault, communication
option fault) occurs, or a communication option fault occurs, the operation continues. When setting "6" in Pr.502, provide
a safety stop countermeasure other than via communication. For example, input a signal through an external terminal
(RES, MRS, or X92) or press the PU stop on the operation panel.
 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.
Communication line status
Communication error
(E.OP1)
Alarm signal (LF)
• Operation from the error occurrence until the Pr.500 setting time elapses
Fault type
PU disconnection,
Ethernet
communication fault,
communication option
fault
Option fault (when a
communication option
is used)
*1 When the communication returns to normal within the time period set in Pr.500, the protective function (E.OP1) is not activated.
*2 When the frequency command interface is switched to the one other than NET during operation, the frequency command given from an external
device can be made valid.
 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.
Count timing depending on
communication line status
NOTE
• Communication error count is temporarily stored in the RAM memory. The error count is stored in the 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 the EEPROM depending
on the reset timing.
164
5. Common Settings
Normal
Error
Pr.500
setting time
Pr.502
Operation
setting
0
1
Operation
2
*1
continues.
6
0 Output shutoff
Output to decelerate
1, 2
and stop the motor
6 Operation continues
at the frequency set in
*2
Pr.779.
Normal
Normal
Error
Recognition
Pr.500
setting time
Display
*1
Normal
"E. 1"
"E. 1" after stop
"CF" warning
Error Normal
Incremented by 1
ON
Fault (ALM) signal
*1
OFF
ON
ON after stop
OFF
Error
Incremented by 1