Omron SYSDRIVE 3G3MV - Page 267

8-14
Fault
display
Probable cause and remedyFault name and Meaning
UL3
(flashing)
ON: Warning
UL3 (Undertorque detection)
Flashing: fault contacts do
not change state.
V/f mode: Inverter output
current fell below the preset
value in constant n118.
Vector mode: Motor current or
torque fell below the preset
value in constants n097 and
n118.
· Load (output current or output torque) is
too low.
® Check the driven machine and correct
the cause of the fault, or decrease the
value of constant n118 up to the
lowest value allowed for the machine.
UL3 OFF: Protective operation
ON: Output is shut OFF and
motor coasts to a stop.
When undertorque is detected,
inverter performs operation
according to the preset setting
of constant n117.
ser
(flashing)
Sequence error (SER)
A sequence change has been
input while the Inverter is in
operation.
Local or remote selection is
input while the Inverter is in
operation.
Note The Inverter coasts to a
stop.
· A sequence error has occurred.
® Check and correct the sequence.
bb
(flashing)
External base block (bb)
The external base block
command has been input.
Note The Inverter coasts to a
stop.
· The external base block command has
been input.
® Remove the cause of external base
block input.
· The sequence is incorrect.
® Check and change the external fault
input sequence including the input
timing and NO or NC contact.
Maintenance Operations Chapter 8