Communication operation and setting
Operation selection at communication error occurrence (Pr. 121, Pr. 122, Pr. 502, Pr. 779)
You can select the inverter operation when a communication line error occurs during RS-485 communication from the
Number of PU
check time interval
Stop mode selection
The above parameters can be set when Pr. 160 Extended function display selection = "0".
Retry count setting (Pr. 121)
Set the permissible number of retries at data receive error occurrence. (Refer to page 230 for data receive error for retry)
When data receive errors occur consecutively and exceed the permissible number of retries set, an inverter trips (E.PUE)
and a motor stops (as set in Pr. 502).
When "9999" is set, an inverter fault is not provided even if data receive error occurs but an alarm signal (LF) is output.
For the terminal used for the LF signal output, assign the function by setting "98 (positive logic) or 198 (negative logic)" in
Pr. 190 or Pr. 192 (output terminal function selection).
Example: PU connector communication, Pr. 121 = "1" (initial value)
Example: PU connector communication, Pr. 121 = "9999"
0 to 10
Number of retries at data receive error occurrence. If the number of
consecutive errors exceeds the permissible value, the inverter will
come to trip (depends on Pr. 502).
Valid only Mitsubishi inverter (computer link operation) protocol
If a communication error occurs, the inverter will not come to trip.
(NET operation mode at initial value)
RS-485 communication can be made. Note that a communication
fault (E.PUE) occurs as soon as the inverter is switched to the
operation mode with command source. (NET operation mode at
Communication check (signal loss detection) time interval
If a no-communication state persists for longer than the permissible
time, the inverter will come to trip (depends on Pr. 502).
No communication check (signal loss detection)
Coasts to stop
Motor runs at the specified frequency at a communication error.
Motor runs at the frequency used before the communication error.
(Refer to page 197)
Fault (E. PUE)