Mitsubishi Electric FR-D710W-0.1K, Инструкция по эксплуатации

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183
Communication operation and setting
4
P
ARAM
ETE
R
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4.19.3 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. (Refer to
page 191
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, Pr. 192 or Pr. 197 (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
The above parameters can be set when Pr. 160 Extended function display selection = "0".
(Refer to page 163)
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.
How the inverter operates at a communication error differs according to the
Pr. 502 Stop mode selection at communication error
setting.
Computer
Reception error
Reception error
Fault (E. PUE)
Inverter
Inverter
Computer
ENQ
ACK
NAK
NAK
Computer
LF OFF OFF
Reception
error
Inverter
Inverter
Computer
ENQ
ACK
NAK NAK
ON
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"
ON OFF
Reception
error
ALM ON