Mitsubishi Electric 800 Series Instruction Manual page 32

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.
• When Pr.502  "0", the normal deceleration time setting (setting in Pr.8, Pr.44, Pr.45, or the like) 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, 3 or 4", 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.
• These parameters are valid under the Network operation mode. When performing communication through RS-485
terminals, set Pr.551 PU mode operation command source selection  "1".
• 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 or 4", 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 or 4", 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".
Caution
 When a communication line error occurs while Pr.502 = "3 or 4", the inverter continues operation. When setting "3 or 4" in Pr.502,
provide a safety stop countermeasure other than via communication. For example, input a signal (RES, MRS, or X92) through an
external terminal or press the PU stop on the operation panel.
31
PARAMETER
4