Omron M1 Series

Alarm
code
Alarm
sub-
code
Name Description Check point and remedy reference
(0LU)
Inverter over-
load
(1) The ambient tem-
perature exceeds the
inverter specification
range
Measure the ambient temperature.
→ Reduce the ambient temperature such
as by improving the air flow to the pan-
el.
(2) 1st Manual Torque
Boost V
oltage (F09*)
too high
Check 1st Manual Torque Boost V
oltage
(F09*) and readjust so that this does not stall
even if data is lowered.
→ Adjust F09*.
(3) Short acceleration/
deceleration time
Recalculate acceleration/deceleration torque
and acceleration/deceleration time required
from the moment of inertia of the load and
acceleration/deceleration time.
→ Lengthen the acceleration/deceleration
time (F07, F08, E10 to E15, H56).
(4) High load Measure the output current.
→ Reduce the load (use the Overload ear-
ly warning 2 Level (OL2) (E34), and re-
duce the load before an overload oc-
curs.) (During winter
, the load may in-
crease.)
→ Decrease the Carrier Frequency (F26).
→
Enable Overload Prevention Control
(H70)
(5) The airflow path is
blocked
Check that there is sufficient installation
space.
→ Ensure sufficient installation space.
Check for fin clogging.
→ Clean.
(6) Reduced fan airflow
because of the cooling
fan service life or of
damage
Check the cumulative run time of the cooling
fan. (Refer to 7-8-13 Cooling Fan Life W
arn-
ing Signal (WAF)
on page 7-99.)
→ Replace the cooling fan.
Visually check that the cooling fan is operat-
ing correctly.
→ Replace the cooling fan.
(7) Long output wiring,
with high leakage cur-
rent
Measure the leakage current
→
Insert an output circuit filter (OFL).
(0PL)
Output phase
loss detection
(1) Disconnected invert
output wiring
Measure the output current.
→ Replace the output wiring.
(2) Motor windings bro-
ken
Measure the output current.
→ Replace the motor.
(3) Loose inverter out-
put terminal connection
Check if inverter output terminal screws are
loose.
→ Tighten to the recommended tightening
torque.
9 Troubleshooting
9-21
M1 Series Standard Type User's Manual (I669)
9-1 Alarm Display and Remedies
9
9-1-2 Alarm Code List