Alarm
code
Alarm
sub-
code
Name Description Check point and remedy reference
(ErP)
RS-485 com-
munications er-
ror (communi-
cations port 2)
(1) Different communi-
cations conditions with
host equipment
Check that parameter (y11 to y19) data
matches host equipment settings.
→ Correct the difference.
(2) Communication
time-out detection timer
(parameter y18) is set,
but communications are
not performed at a de-
fined cycle
Inspect the host controller side.
→ Change the host controller software
settings, or disable the communication
time-out detection timer (parameter
{y08}/y18=0).
Set (parameter y18 = 0) to disabled.
(3) Error in host control-
ler (software, settings,
hardware, etc.)
Inspect the host controller (programmable
controller
, PC, etc.).
→ Eliminate the cause of the error in the
host controller.
(4) Error in the RS-485
converter (connection,
settings, hardware,
etc.)
Inspect the RS-485 converter (bad connec-
tion, etc.).
→ Change RS-485 converter settings, re-
connect, or replace hardware (replace
with recommended equipment).
(5) Communications ca-
ble disconnection, bad
connection
Check cable continuity and connections of
the cable.
→
Replace the communications cable.
(6) Strong noise re-
ceived from surrounds
Check methods for measures against noise
(grounding conditions, communications ca-
ble/main circuit wiring and installation).
→ Implement measures against noise.
→ Implement measures against noise for
the host controller
.
→ Replace the RS-485 converter with the
recommended equipment (isolated
type).
(7) T
ermination resist-
ance is not set correctly
Check if this inverter is the network terminal
device.
→ Set the RS-485 communications termi-
nating resistor selector switch (SW3/
SW2) correctly
.
(If terminal, switch is ON)
9 Troubleshooting
9-9
M1 Series Standard Type User's Manual (I669)
9-1 Alarm Display and Remedies
9
9-1-2 Alarm Code List
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