Mitsubishi Electric FR-A720-00030-NA Instruction Manual page 376

Table of Contents

 Faults history

Fault history 1

Fault history 2

Fault history 3

Fault history 4

Fault history 5

Fault history 6

Fault history 7

Fault history 8

* Refer to page 411 for details of fault description.

(7) Pr. 343 Communication error count

You can check the cumulative number of communication errors.

The number of communication errors is temporarily stored into the RAM. As it is not stored into the EEPROM, performing

a power supply reset or inverter reset clears the value to 0.

(8) Output signal LF "alarm output (communication error warnings)"

During a communication error, the alarm signal (LF signal) is output by open collector output. Assign the used

terminal using any of Pr. 190 to Pr. 196 (output terminal function selection).

Communication

The LF signal can be assigned to the output terminal using any of Pr. 190 to Pr. 196. When terminal assignment is changed, the

other functions may be affected. Set parameters after confirming the function of each terminal.

Fault code list

Setting Range

Minimum Setting Range

Not increased

Communication error count is increased in

synchronization with leading edge of LF signal

Communication operation and setting

Being 2 bytes in length, the data is stored as

"H00". Refer to the lowest 1 byte for the fault

Performing write using the register 40501 batch-

clears the faults history. Set any value as data.

Initial Value

Turns off when normal data is received

Alarm data :

Data resulting in

communication error.