
6
-10
OH3
Motor Overheat 1
(flashing)
Motor Overheating Alarm
Detected when the level at A2,
programmed for motor tempera-
ture (Thermistor input, H3-09 =
E), exceeds 1.17 V for the time
L1-05 and L1-03 = 3.
Overheating of the motor as mea-
sured by the motor thermistor.
Recheck the cycle time and
the size of the load.
Recheck the accel and decel
times (C1-
)
Recheck the V/f pattern
(E1-
).
Recheck the motor rated cur-
rent value (E2-01)
OL3
Cur Stuck 1
(flashing)
Cur Stuck 1
The Inverter’s output current (V/f
control) or the output torque (Vec-
tor control) exceeded L6-02 for
longer then the time set in
L6-03 and L6-01 = 1 or 2
Motor was overloaded
Ensure the values in L6-02
and L6-03 are appropriate.
Check application/machine
status to eliminate fault.
OL4
Cur Stuck 2
(flashing)
Cur Stuck 2
The Inverter’s output current (V/f
control) or the output torque (Vec-
tor control) exceeded L6-02 for
longer then the time set in
L6-03 and L6-01 = 1 or 2
Motor was overloaded
Ensure the values in L6-05
and L6-06 are appropriate.
Check application/machine
status to eliminate fault.
UL3
Undertorque Det 1
(flashing)
Undertorque Detection 1
The Inverter’s output current (V/f
control) or the output torque (Vec-
tor control) fell below L6-02 for
longer then the time set in L6-03
and L6-01 = 5 or 6.
Motor was underloaded
Ensure the values in L6-02
and L6-03 are appropriate.
Check application/machine
status to eliminate fault.
UL4
Undertorque Det 2
(flashing)
Undertorque Detection 2
The Inverter’s output current (V/f
control) or the output torque (Vec-
tor control) fell below L6-05 for
longer then the time set in L6-06
and L6-04 = 5 or 6.
Motor was underloaded
Ensure the values in L6-05
and L6-06 are appropriate.
Check application/machine
status to eliminate fault.
OS
Overspeed Det
(flashing)
Overspeed Alarm
Detected when A1-02 = 1 or 3
and F1-03 = 3.
The motor speed feedback
(U1-05) exceeded the value set in
F1-08 for a time longer than the
setting in F1-09.
Overshooting/undershooting are
occurring.
Adjust the ASR settings in the
C5 parameter group.
The reference was too high.
Check the reference circuit
and reference gain.
The settings in F1-08 and F1-09
are not appropriate.
Check the settings in F1-08
and F1-09
PGO
PG Open
(flashing)
PG Disconnection
Detected when F1-02 = 3 and A1-
02 = 1 or 3.
Detected when no PG (encoder)
pulses are received for a time
longer than the setting in F1-14
There is break in the PG wiring.
Fix the broken/disconnected
wiring.
The PG is wired incorrectly.
Fix the wiring
Power is not being supplied to the
PG.
Fix the wiring.
Power isn't being supplied to the
PG.
Supply power to the PG prop-
erly.
Table 6.2 Alarm Detection
Display
Meaning
Probable causes
Corrective Actions
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