185
Communication operation and setting
4.17.3 Operation selection at communication error occurrence
(Pr. 121, Pr. 122, Pr. 502, Pr. 779)
You can select the drive unit operation when a communication line error occurs during RS-485 communication from the
PU connector. The operation is active under the Network operation mode.
Parameter
Number
Name
Initial
Value
Setting Range
Description
121
Number of PU
communication
retries
1
0 to 10
Number of retries at data receive error occurrence. If the number of
consecutive errors exceeds the permissible value, the drive unit will
come to trip (depends on
Pr. 502
).
Valid only Mitsubishi drive unit (computer link operation) protocol
9999
If a communication error occurs, the drive unit will not come to trip.
(NET operation mode at initial value)
122
PU communication
check time interval
0s
0s
RS-485 communication can be made. Note that a communication
fault (E.PUE) occurs as soon as the drive unit is switched to the
operation mode with command source. (NET operation mode at
initial value)
0.1 to 999.8s
Communication check (signal loss detection) time interval
If a no-communication state persists for longer than the permissible
time, the drive unit will come to trip (depends on
Pr. 502
).
9999
No communication check (signal loss detection)
502
Stop mode
selection at
communication
error
0
At fault
occurrence
Indication
Fault
output
At fault removal
0
Coasts to stop
E.PUE
Output
Stop
(E.PUE)
1
Decelerates to
stop
After stop
E.PUE
Output
after stop
Stop
(E.PUE)
2
Decelerates to
stop
After stop
E.PUE
Without
output
Automatic restart
functions
3
Continues
running at
Pr. 779
—
Without
output
Operates in normal
condition
779
Operation speed
during
communication
error
9999
0 to 12000r/min /
0 to 8000r/min
Motor runs at the specified speed at a communication error.
9999
Motor runs at the speed used before the communication error.
The above parameters can be set when
Pr. 160 Extended function display selection
= "0".
The value left of the slash is for the 2.2K drive unit or lower. The one right of the slash is for the 3.7K drive unit.
If a value exceeding the upper speed limit of the motor is set, the actual operation will be limited at the maximum rotation speed. The setting range is for
the S-PM motor. The maximum setting value differs depending on the number of poles of the applied motor.
Summary of Contents for FR-D720-0.2K-G
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