Alarm
code
Alarm
sub-
code
Name Description Check point and remedy reference
(0Un)
Overvoltage
(3) Short deceleration
time for the moment of
inertial of the load.
Recalculate the deceleration torque from the
moment of inertia of the load and the decel-
eration time.
→ Lengthen the deceleration time (F08,
E1
1, E13, E15, H56).
→ Enable Anti-regenerative Control Func-
tion Selection (H69) or Over-Excitation
Control Selection during Deceleration
Function Selection (H71).
→
Enable torque limit (F40, F41, E16,
E17).
→ Set 1st Rated Voltage at Base Fre-
quency (F05*) to 0, and increase brak-
ing performance.
→ Consider use of braking resistor.
(4) Short acceleration
time
Check if an overvoltage alarm occurs at the
end of sudden acceleration.
→ Lengthen the acceleration time (F07,
E10, E12, E14).
→ Use Acceleration/Deceleration Pattern
Selection (H07).
→ Consider use of braking resistor.
(5) High braking load Compare load braking torque and inverter
braking torque.
→ Set 1st Rated Voltage at Base Fre-
quency (F05*) to 0, and increase brak-
ing performance.
→ Consider use of braking resistor.
(6) Output has a ground
fault
If this operates correctly when run with wiring
removed from the inverter output terminal (U,
V
, W).
→ Check that the output wiring or the mo-
tor do not have a ground fault.
If an overvoltage is displayed when run with
wiring removed from the inverter output ter-
minal (U, V, W).
→ This indicates an inverter fault possibili-
ty. Please contact OMRON.
(7) Malfunction be-
cause of noise
Check that the Main Circuit DC Voltage at
the time of overvoltage is at or below the
overvoltage level.
→
Implement measures against noise.
→ Enable Retry Count at Trip (H04).
→ Connect a surge absorber to coils, sol-
enoids, etc. in magnetic contactors that
are the cause of noise.
(PbF)
Charging circuit
malfunction (1.5
kW min.)
(1) The charging circuit
is damaged
Repair of the inverter is required.
→ Please contact OMRON.
9 Troubleshooting
9-23
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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