7-5
7
UL4
Undertorq Det 2
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
7 or 8.
Motor was underloaded.
Ensure the values in L6-05 and L6-
06 are appropriate.
Check application/machine status
to eliminate fault.
OS
Overspeed Det
Motor Overspeed
Detected when F1-03 is set to 0, 1 or 2
and A1-02 is set to 3.
The motor speed feedback (U1-05)
exceeded the setting 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
PG Disconnection
Detected when F1-02 is set to 0, 1 or 2
and A1-02 is set to 3 or 6
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. Fix the wiring.
Power is not supplied to the PG.
Supply power to the PG
properly.
Wrong brake control sequence. The
motor runs against the closed brake.
Check the sequence and if the brake
is opened when the inverter starts to
increase the speed.
DEV
Speed Deviation
Excessive Speed Deviation
Detected when F1-04 is set to 0, 1 or 2
and A1-02 is set to 3 or 6
The speed deviation is higher than the
setting of F1-10 for a time longer than
the setting 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 of F1-10 and F1-11 are not
appropriate.
Check the settings of F1-10 and F1-
11.
Wrong brake control sequence. The
motor runs against the closed brake.
Check the sequence and if the brake
is opened when the inverter starts to
increase the speed.
DV3
Wrong rotation direction
Detected when the speed deviation is
higher than 30% and the torque refer-
ence and acceleration have opposite
signs.
PG wire broken Check the PG wiring
Incorrect PG wiring Correct the wiring
Wrong magnet position compensation
value (F1-22)
Verify the PG direction and execute
an encoder offset auto tuning
The load is too large
Reduce the load and check the
brake
DV4
Wrong rotation direction
Detected when F1-19 is not 0, the
speed reference and motor speed have
opposite signs and the detection thresh-
old set in F1-19 is exceeded.
The magnet position offset setting in
F1-22 is wrong
Verify the PG direction and execute
an encoder offset auto tuning
The load is too large
Reduce the load and check the
brake
DV6
Over Acceleration
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 offset
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.
SVE
Zero Servo Fault
Zero Servo Fault
The motor position moved during Zero
Servo Operation.
The torque limit is too small. Increase the torque limit.
The load torque is too large. Decrease the load torque.
- Check for signal noise.
Table 7.1 Resetable Faults
Display Meaning Probable Causes Corrective Actions
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