Mitsubishi Electric FR-A500 Instruction Manual page 243

<When used with communication options >
Operation at a communication error occurrence (when a communication option is
connected)
You can select operation at a communication error occurrence by setting Pr. 500 to Pr. 502 during network
operation with a communication option. (not available with the FR-A5NM, FR-A5NP, and FR-A5NR
(communication options).)
(1) Operation selection at a communication error occurrence
1) Pr. 500 "communication error recognition waiting time
You can set the waiting time from when a communication line fault occurs until it is recognized as a
communication error.
Parameter Number
500
Communication line status
Communication error (OP3)
The communication line fault which still persists after the time set in Pr. 500 has elapsed is recognized as a
communication error.
When the fault is restored to normal communication within the set time, it is not regarded as a
communication error and operation continues.
2) Pr. 501 "communication error occurrence count display"
The cumulative number of communication error occurrences can be indicated. Write 0 to erase this
cumulative count.
Parameter Number
501
Count timing depending on
communication line status
At the point of communication line fault occurrence, Pr. 501 "communication error occurrence count display"
is incremented by 1.
Note: The communication error occurrence count is stored into RAM temporarily. Since this data is stored
2
in E PROM at one-hour intervals, performing power-on reset or inverter reset may cause the Pr. 501
data to be the value stored in E
Setting Range
0 to 999.8s
Setting Range
0
Normal Abnormal
Incremented by 1
2
PROM the last time depending on the reset timing.
Minimum Setting Increments
0.1s
Normal Abnormal
Time set in Pr. 500
Minimum Setting Increments
1
Normal Abnormal
Incremented by 1
234
OPTIONS
Factory Setting
0
Recognition
Factory Setting
0