(N) Operation via communication and its settings
125
5
GROUP
N
Retry count setting (Pr.121)
• Set the permissible number of retries for data receive error occurrence. (Refer to
for data receive error for retry.)
• When the data receive errors occur consecutively and the number of retries exceeds the permissible number setting, a
communication fault (E.PUE) occurs and the inverter output is shut off.
• When a data transmission error occurs while "9999" is set, the inverter output is not shut off but outputs the Alarm (LF)
signal. To use the LF signal, set "98 (positive logic) or 198 (negative logic)" in any of
Pr.190 to Pr.195 (Output terminal
function selection)
to assign the function to an output terminal.
Signal loss detection (Pr.122)
• If signal loss is detected between the converter unit and the computer, the communication fault (E.PUE) will occur and the
inverter output is shut off.
• When the setting is "9999", communication check (signal loss detection) is not made.
• When the setting is "0", communication is not possible.
• Setting any value from 0.1 s to 999.8 s will enable signal loss detection. To detect signal loss, data must be sent from the
computer within the communication check time interval (for further information on control codes, refer to
). (The
converter unit makes a communication check (clearing of communication check counter) regardless of the station number
setting of the data sent from the master.)
Computer
Example:
Pr.121
= "1" (initial value)
Example:
Pr.121
= "9999"
Reception error
Reception error
Fault (E.PUE)
Converter unit
Computer
Converter unit
Computer
Converter unit
Computer
ENQ
ACK
NAK
NAK
LF
OFF
OFF
ENQ
ACK
NAK
NAK
ON
ON
Illegal
Illegal
ENQ
ACK
Normal
ENQ
Illegal
ENQ
Illegal
Reception error
Reception error
ALM
ON
ALM
Converter unit
Computer
Example: PU connector communication,
Pr.122
= 0.1 to 999.8 s
Check start
Fault (E.PUE)
Time
Converter unit
Converter unit
Computer
Communication
check counter
Pr.122
ENQ
ALM
OFF
ON
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