
Communication operation and settings
Parameter
6 - 200
Retry count setting (Pr.121)
Set the permissible number of retries at data receive error occurrence. (Refer to page 6-211 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, Pr. 192 or Pr. 197.
쑶
Example
쑴
PU connector communication at different settings of parameter 121
I001354E
Fig. 6-104:
Data transmission error
NOTE
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.
ENQ
ACK
NAK
NAK
ENQ
ACK
NAK
NAK
ENQ
ACK
ENQ
E
NQ
Computer
⇓
Data flow
Inverter
Inverter
⇓
Data flow
Computer
Wrong
Reception error
Fault E.PUE
Reception error
Wrong
PU connector communication, Pr. 121 = 1 (initial value)
PU connector communication, Pr. 121 = 9999
Reception
error
Reception
error
Computer
⇓
Data flow
Inverter
Inverter
⇓
Data flow
Computer
OFF
OFF
ON
Wrong
Wrong
Normal
LF
OFF
ON
Содержание FR-D720S SC EC
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Страница 24: ...Description of the case Product checking and part identification 1 4 ...
Страница 108: ...Operation panel Operation 4 20 ...
Страница 436: ...Setting for the parameter unit and operation panel Parameter 6 286 ...
Страница 484: ...Measurements on the main circuit Maintenance and inspection 8 14 ...
Страница 504: ...Specification change Appendix A 20 ...
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Страница 510: ...Index Appendix A 24 ...
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