Mitsubishi Electric FR-A820-00046 Instruction Manual page 833

Parameters
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-A800-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-A800-E only)
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-A800-E: an Ethernet connector communication error) occurs and Pr. 502
becomes invalid.
For FR-A800-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.
During position control, an error occurs even if "2" is set in Pr. 502.
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).
FR-A800
(N) Operation via communication and its settings
set Pr. 551 "PU
,
5 - 631