(N) Operation via communication and its settings
562
PARAMETERS
NOTE
• Fault output indicates the Fault signal (ALM) and an alarm bit output.
• When the fault output is set enabled, fault records are stored in the faults history. (A fault record is written to the faults history
at a fault output.)
• When the fault output is not set enabled, fault record is overwritten to the faults history of the faults history temporarily but not
stored.
• After the fault is removed, the fault indication goes back to normal indication on the monitor, and the faults history goes back
to the previous status.
• If Pr.502 is set to "1, 2, or 3", the normal deceleration time setting (settings like Pr.8, Pr.44, and Pr.45) is applied as the
deceleration time. Normal acceleration time setting (settings like Pr.7 and Pr.44) is applied as the acceleration time for
restart.
• When Pr.502 = "2 or 3", the inverter operates with the start command and the speed command, which were used before the
fault.
• If a communication line error occurs, then the error is removed during deceleration while Pr.502 = "2", the motor re-
accelerates from that point.
• The Pr.502 and Pr.779 settings are valid when communication is performed via the RS-485 terminals or a communication
option.
• These parameters are valid under the Network operation mode. When performing communication with RS-485 terminals, set
Pr.551 PU mode operation command source selection to "2 (initial value)".
• Pr.502 is valid for the device that has the command source under the Network operation mode. If a communication option is
installed while Pr.550 = "9999 (initial value)", a communication error in RS-485 terminals occurs and Pr.502 becomes invalid.
• If the communication error setting is disabled with Pr.502 = "3", Pr.335 = "9999", and Pr.539 = "9999", the inverter does not
continue its operation with the frequency set by Pr.779 at a communication error.
• If a communication error occurs while continuous operation at Pr.779 is selected with Pr.502 = "3", the inverter operates at
the frequency set in Pr.779 even though the speed command source is at the external terminals.
Example) If a communication error occurs while Pr.339 = "2" and the external terminal RL is ON, the operation is continued at
the frequency set in Pr.779.
• During position control, a fault is output without deceleration even if Pr.502 = "2".
Pr.7 Acceleration time, Pr.8 Deceleration time page 285
Pr.335 RS-485 communication retry count page 563
Pr.336 RS-485 communication check time interval page 563
Pr.539 Modbus-RTU communication check time interval page 579
Pr.550 NET mode operation command source selection page 316
Pr.551 PU mode operation command source selection page 316
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