Omron VARISPEED L7 Manual page 255

Display
UL3
Undertorque Det 1
(flashing)
UL4
Undertorque Det 2
(flashing)
OS
Overspeed Det
(flashing)
PGO
PG Open
(flashing)
7
DEV
Speed Deviation
(flashing)
EF0
Opt External Flt
(flashing)
10
7-
Table 7.3 Alarm Detection
Meaning
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.
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.
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.
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
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.
An over acceleration of the car was
detected (A1-02 = 6 only)
Communication Option Card External
Fault
Probable causes
Motor was underloaded
Motor was underloaded
Overshooting/undershooting occurs.
The reference was too high.
The settings in F1-08 and F1-09 are not
appropriate.
The PG wiring is broken.
The PG is wired incorrectly.
Power is not supplied to the PG.
The load is too large.
The acceleration time and deceleration
time are too short.
The load is locked.
The settings in F1-10 and F1-11 are not
appropriate.
The load is too large
Magnet position offset is wrong
Sheave diameter, gear ratio or roping
setting incorrect
Too short acceleration or deceleration
time.
An external fault condition was input
from by communication option card.
Corrective Actions
Ensure the values in L6-02 and L6-
03 are appropriate.
Check application/machine status
to eliminate fault.
Ensure the values in L6-05 and L6-
06 are appropriate.
Check application/machine status
to eliminate fault.
Adjust the ASR settings in the C5
parameter group.
Check the reference circuit and ref-
erence gain.
Check the settings in F1-08 and
F1-09.
Fix the broken/disconnected wir-
ing.
Check the wiring
Supply the correct power to the PG.
Reduce the load.
Lengthen the acceleration time and
deceleration time.
Check the mechanical system.
Check the settings in F1-10 and F1-
11.
Reduce the load
Check the PG direction, check
F1-22 and perform an encoder off-
set tuning.
Verify the settings of S3-13, S3-14
and S3-15.
Adjust the acceleration and deceler-
ation times.
Check for an external fault condi-
tion.
Verify the parameters.
Verify communication signals