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er8
RS-485 communications error
Problem
A communications error occurred during RS-485 communication.
Possible Causes
What to Check and Suggested Measures
(1) Communications
conditions of the inverter
do not match that of the
host equipment.
Compare the settings of the y codes (y01 to y10) with those of the
host equipment.
Î
Correct any mismatch.
(2) Even though
no-response error
detection time (y08) has
been set,
communications is not
performed within the
specified cycle.
Check the host equipment.
Î
Change the settings of host equipment software or disable the
no-response error detection (y08 = 0).
(3) The host equipment
(e.g., PLCs and
computers) did not
operate due to incorrect
settings or
software/hardware
defective.
Check the host equipment.
Î
Remove the cause of the equipment error.
(4) RS-485 converter did
not operate due to
incorrect connections or
settings, or defective
hardware.
Check the RS-485 converter (e.g., check for poor contact).
Î
Change the various RS-485 converter settings, reconnect the
wires, or replace hardware with recommended devices as
appropriate.
(5) Broken communications
cable or poor contact.
Check the continuity of the cable, contacts and connections.
Î
Replace the cable.
(6) Inverter affected by
strong electrical noise.
Check if appropriate noise control measures have been
implemented (e.g., correct grounding and routing of control and
main circuit wires).
Î
Implement noise control measures.
Î
Implement noise reduction measures at the host side.
Î
Replace the RS-485 converter with a recommended insulated
one.