Operation Selection At A Communication Error (Pr.502, Pr.779) - Mitsubishi Electric 800 Series Instruction Manual

4.3.3

Operation selection at a communication error (Pr.502, Pr.779)

• During communication via the RS-485 terminals, the inverter operation at a communication error can be selected. The
operation is active under the Network operation mode.
• Select the stop operation at the retry count excess (Pr.335, only with Mitsubishi inverter protocol) or at a signal loss
detection (Pr.336, Pr.539).
• When a communication error is detected during communication via the RS-485 terminals, the Alarm (LF) signal is output via
an output terminal of the inverter. For the LF signal, set "98 (positive logic) or 198 (negative logic)" in any of Pr.190 to Pr.196
(output terminal function selection) to assign the function to the output terminal. (If communication is not performed for
the time set in Pr.336 or longer, the LF signal is output when "3 or 4" is set in Pr.502.)
Pr.502
setting Operation
0
Output shutoff
(initial value)
1 Output to
decelerate and
2
stop the motor
Operation
3
continues at the
set frequency of
4
Pr.779.


Under position control, the operation is continued to the target position.

When the communication error is removed during deceleration, the motor re-accelerates.
Under position control, the motor does not re-accelerates even when the communication error is removed during deceleration.
At fault occurrence
Fault (ALM)
Indication
signal
"E. SER" ON
ON after stop
"E. SER" after
stop
OFF
Normal OFF
"CF" OFF
At fault removal
Operation Indication
Output stop status
"E. SER"
continues.
Restart Normal

Normal Normal
Fault (ALM)
signal
ON
OFF
OFF
29
PARAMETER
4