Mitsubishi Electric FR-F740 EC Instruction Manual page 417

Parameter
NOTES The fault output indicates fault output signal (relay output – terminals ABC) or alarm bit output.
When the setting was made to provide a fault output, the fault description is stored into the
faults history. (The fault description is written to the faults history when a fault output is pro-
vided.) When no fault output is provided, the fault definition overwrites the fault indication of
the faults history temporarily, but is not stored. After the fault is removed, the fault indication
returns to the ordinary monitor, and the faults history returns to the preceding fault indication.
When the Pr. 502 setting is "1", "2" or "3" the deceleration time is the ordinary deceleration
time setting (e.g. Pr. 8, Pr. 44, Pr. 45). In addition, acceleration time for restart is the normal
acceleration time (e.g. Pr. 7, Pr. 44).
When "2" or "3" is set in Pr. 502, run command/speed command at restarting follows the
command before an fault occurrence.
When "2" is set in Pr. 502 at occurrence of a communication error and the error is removed
during deceleration, the inverter accelerates again at that point.
These parameters are valid when communication is performed from the RS485 terminals or
a communication option.
These parameters are valid under the Network operation mode. When performing communi-
cation with RS485 terminals, set Pr. 551 "PU mode operation command source selection" =
"2" (initial setting).
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 setting), a com-
munication error in RS485 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.
FR-F700 EC
Communication operation and setting
6 - 267