7-10
7
UL3
Undertorque Det 1
(flashing)
Undertorque Detection 1
The Inverter’s output current (V/f con-
trol) or the output torque (Vector con-
trol) fell below L6-02 for longer than
the time set in L6-03 and L6-01 is set to
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 con-
trol) or the output torque (Vector con-
trol) fell below L6-05 for longer than
the time set in L6-06 and L6-04 is set to
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 is set to 1 or 3
and F1-03 is set to 3.
The motor speed feedback (U1-05)
exceeded the value set in F1-08 for a
time longer than the setting of F1-09.
Overshooting/undershooting occurs.
Adjust the ASR settings in the C5
parameter group.
The reference was too high.
Check the reference circuit and ref-
erence 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 is set to 3 and
A1-02 is set to 1 or 3.
Detected when no PG (encoder) pulses
are received for a time longer than the
setting of F1-14
The PG wiring is broken.
Fix the broken/disconnected wir-
ing.
The PG is wired incorrectly. Check the wiring
Power is not supplied to the PG. Supply the correct power to the PG.
DEV
Speed Deviation
(flashing)
Excessive Speed Deviation
Detected when F1-04 is set to 3 and
A1-02 is set to 1 or 3.
The speed deviation is higher than the
setting of F1-10 for longer than the set-
ting of F1-11.
The load is too large. Reduce the load.
The acceleration time and deceleration
time are too short.
Lengthen the acceleration time and
deceleration time.
The load is locked. Check the mechanical system.
The settings in F1-10 and F1-11 are not
appropriate.
Check the settings in F1-10 and F1-
11.
An over acceleration of the car was
detected (A1-02 = 6 only)
The load is too large Reduce the load
Magnet position offset is wrong
Check the PG direction, check
F1-22 and perform an encoder off-
set tuning.
Sheave diameter, gear ratio or roping
setting incorrect
Verify the settings of S3-13, S3-14
and S3-15.
Too short acceleration or deceleration
time.
Adjust the acceleration and deceler-
ation times.
EF0
Opt External Flt
(flashing)
Communication Option Card External
Fault
An external fault condition was input
from by communication option card.
Check for an external fault condi-
tion.
Verify the parameters.
Verify communication signals
Table 7.3 Alarm Detection
Display Meaning Probable causes Corrective Actions
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