Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 632

 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
Communication
2, 12
line
3
4
0, 3
1, 2, 11,
Communication
12
option (when a
communication
option is used)
4
*1 If in communication by the communication option, "E.OP1" is displayed.
*2 Under position control, the operation is continued to the target position.
*3 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
*1
Output shutoff
E. SER
"E.SER"
Output to
indication after
decelerate and
*1
stop the motor
stop
Operation Normal
continues at
the frequency
"CF" warning
*2
set in Pr.779.
Output shutoff "E. 1"
Output to
decelerate and "E. 1" after stop
stop the motor
Operation
continues at
"CF" warning
the frequency
*2
set in Pr.779.
Operation to a stop at a communication error occurrence
Fault (ALM)
Operation
signal
Output stop
ON
status
continues.
ON after stop
*3
OFF
Restart
OFF Normal
ON
Output stop
status
ON after stop
continues.
Operation
continues at
OFF
the frequency
set in Pr.779.
5.15 (N) Communication operation parameters
At fault removal
Fault (ALM)
Indication
signal
*1
ON
E. SER
Normal OFF
Normal OFF
"E. 1" ON
"CF" warning OFF
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
631