Mitsubishi Electric 800 Series Instruction Manual page 548

Operation selection at a communication error (Pr.502, Pr.779)
• For communication using RS-485 terminals or a communication option, 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, enabled only when the Mitsubishi inverter protocol is selected)
or at a signal loss detection (Pr.336, Pr.539).
Pr.502
Fault type
setting
0 (initial
value)
1, 11
2, 12
Communication
line
3
4
0, 3
1, 2, 11,
Communication 12
option (when a
communication
option is used)
4

If in communication by the communication option, "E.OP1" is displayed.

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-
accelerate even when the communication error is removed during deceleration.
• The motor is decelerated to a stop according to the setting of Pr.111 Third deceleration time when an error occurs while
Pr.502 = "11 or 12".
Pr.502 setting
0 Output shutoff
1 to 4 Deceleration stop according to the selected deceleration time (selectable using the RT or X9 signal)
11, 12 Deceleration stop according to the setting of Pr.111
• When a communication error is detected while communication with the RS-485 terminals is performed, the Alarm (LF)
signal is output to an output terminal of the inverter. To use 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. (To output the
LF signal even if communication through RS-485 terminals is not performed for the time set in Pr.336 or longer, or during
communication using a communication option, set "3 or 4" in Pr.502.)
At fault occurrence
Operation Indication
Output shutoff E. SER

Output to
"E.SER"
decelerate
indication after
and stop the
stop

motor.
Operation Normal
continues at
the frequency
"CF" warning
set in
Pr.779.

Output shutoff "E. 1"
Output to
decelerate
"E. 1" after stop
and stop the
motor.
Operation
continues at
the frequency "CF" warning
set in
Pr.779.

Operation to a stop at a communication error occurrence
(N) Operation via communication and its settings
Fault (ALM)
Operation
signal
Output stop
ON
status
continues.
ON after stop
OFF Restart

OFF Normal
ON
Output stop
status
ON after stop
continues.
Operation
continues at
OFF
the frequency
set in Pr.779.
At fault removal
Fault (ALM)
Indication
signal
E. SER ON

Normal OFF
Normal OFF
"E. 1" ON
"CF" warning OFF
547
PARAMETERS
5
GROUP
N