Mitsubishi Electric FR-F800 Series Instruction Manual page 513

*3 Data check time
Monitoring, operation command, frequency setting (RAM) Less than 12 ms
Parameter read/write, frequency setting (EEPROM)
Parameter clear / All parameter clear
Reset command
 Retry count setting (Pr.121, Pr.335)
• Set the permissible number of retries at data receive error occurrence. (Refer to
• When the data receive errors occur consecutively and the number of retries exceeds the permissible number setting, a
communication fault (PU connector communication: E.PUE, RS-485 terminal communication: E.SER) occurs and the
inverter output is shut off.
• When a data transmission error occurs while "9999" is set, the inverter does not shut off its output but outputs the Alarm
(LF) signal. To use the LF signal, set "98 (positive logic) or 198 (negative logic)" in any parameter from Pr.190 to Pr.196
(Output terminal function selection) to assign the function to an output terminal.
Computer
Inverter
Computer
Inverter
NOTE
• For the RS-485 terminal communication, the operation at a communication error occurrence depends on the Pr.502 Stop
mode selection at communication error setting. (Refer to
512
5. PARAMETERS
5.12 (N) Communication operation parameters
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Item
Example: PU connector communication, Pr. 121 = "1" (initial value)
Inverter
Computer
ALM
Example: PU connector communication, Pr. 121 = "9999"
Inverter
Computer
LF OFF
ALM
search engine
Check time
Less than 30 ms
Less than 5 s
No reply
Illegal Illegal
Reception error
Illegal Illegal
Reception error
ON
OFF
page 500.)
page 511 for data receive error for retry.)
Fault (E.PUE)
Reception error
ON
Normal
Reception error
ON