8-4
Fault
display
Probable cause and remedyFault name and
meaning
uU2 Control power supply
undervoltage (UV2)
The control power supply
voltage has reached the
undervoltage detection
level.
· Internal circuit fault.
® Turn the Inverter OFF and ON.
® Change the Inverter if the same fault occurs
again.
OH Radiation fin
overheated (OH)
The temperature of the
radiation fins of the
Inverter has reached
110_C ± 10_C.
· The ambient temperature is too high.
® Ventilate the Inverter or install a cooling unit.
· The load is excessive.
® Reduce the load.
® Decrease the Inverter capacity.
· The V/f setting is incorrect.
® Reduce the V/f set voltage.
· The acceleration/deceleration time is too short.
® Increase the acceleration/deceleration time.
· The ventilation is obstructed.
® Change the location of the Inverter to meet the
installation conditions.
· The cooling fan of the Inverter does not work.
® Replace the cooling fan.
Maintenance Operations Chapter 8
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