Mitsubishi Electric FR-F700PJ Series, Инструкция по эксплуатации

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Communication operation and setting
4.20.3 Operation selection at communication error occurrence (Pr. 121, Pr. 122, Pr. 502, Pr. 779)
(1) Retry count setting (Pr. 121)
 Set the permissible number of retries at data receive error occurrence. (Refer to page 230 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
Pr. 190 or 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 will
come to trip (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.
(NET operation mode at initial value)
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. (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 inverter 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
normally
779
Operation frequency
during
communication
error
9999
0 to
400Hz
Motor runs at the specified frequency at a communication error.
9999 Motor runs at the frequency used before the communication error.
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)
Computer
Reception error
Fault (E. PUE)
Inverter
Inverter
Computer
ENQ
ACK
NAK
NAK
LF OFF
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 ON ALM
ON ON
Reception error
Reception error Reception error
Computer
Inverter
Inverter
Computer