Mitsubishi Electric FR-F820-00077 Instruction Manual page 636

(N) Operation via communication and its settings
NOTES If a communication line error occurs, then the error is removed during deceleration while Pr. 502 =
"2", the motor re-accelerates from that point. (When a communication option is used, acceleration
does not restart at a communication option error.)
The Pr. 502 and Pr. 779 settings are valid when communication is performed via the RS-485 termi-
nals, via the Ethernet connector (FR-F800-E only), 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 com-
mand source selection" ≠ "1".
● When performing communication via the Ethernet connector (FR-F800-E only), set Pr. 551 "PU
mode operation command source selection" ≠ "5".
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 (for FR-F800-E: an Ethernet connector communication error) occurs and Pr. 502
becomes invalid.
For FR-F800-E: If the communication error setting is disabled with the settings of Pr. 502 = "3" and
Pr. 1432 = "9999", the inverter does not continue its operation at the frequency set in Pr. 779 when
a communication error occurs.
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 commu-
nication 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 RL signal is input through an external
terminal, the operation is continued at the frequency set in Pr. 779.
CAUTION:
E
When Pr. 502 = "3" and a communication line error occurs, or Pr. 502 = "4" and a communication
line error or a communication option fault occurs, the operation continues. When setting "3 or
4" in Pr. 502, provide a safety stop countermeasure other than via communication. For example,
input a signal through an external terminal (RES, MRS, or X92) or press the PU stop on the
operation panel (refer to page 4-2).
5 - 464
Parameters