215
Communication operation and setting
4.20.3 Operation selection at communication error occurrence (Pr. 121, Pr. 122, Pr. 502)
(1) Retry count setting
(Pr.121)
Set the permissible number of retries at data receive error occurrence. (
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
any of
Pr. 190 to Pr. 192 (output terminal function selection)
.
You can select the inverter operation when a communication line error occurs during RS-485 communication from the
PU connector.
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 inverter trips
(depends on
Pr. 502
).
Valid only Mitsubishi inverter (computer link operation) protocol
9999
If a communication error occurs, the inverter will not come to trip.
122
PU communication
check time interval
0
0
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.
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 inverter trips (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, 3
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
The above parameters can be set when
Pr. 160 User group read selection
= "0".
REMARKS
Pr. 121
is valid only when Mitsubishi inverter (computer link operation) protocol is selected.
Pr. 121
is not valid when Modbus-
RTU communication protocol is selected.
Computer
Reception error
Reception error
Fault (E. PUE)
Inverter
Inverter
Computer
ENQ
ACK
NAK
NAK
Computer
Reception
error
Reception
error
Inverter
Inverter
Computer
ENQ
ACK
NAK
NAK
Wrong
Wrong
ENQ
ACK
Normal
ENQ
Wrong
ENQ
Wrong
Example: PU connector communication,
Pr. 121
= "1" (initial value)
Example: PU connector communication,
Pr. 121
= "9999"
OFF
OFF
LF
ON
OFF
ON
Summary of Contents for FR-E710W-0.1K
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