4-3
Fault
display
Probable cause and remedyFault name and meaning
uU1
Main circuit undervoltage
(UV1)
The main circuit DC voltage
has reached the undervoltage
detection level (160 V DC for
the 3G3JV-A1j).
• Power supply to the Inverter has phase loss, power input
terminal screws are loose, or the power cable is discon-
nected.
→ Check the above and take necessary countermeasures.
• Incorrect power supply voltage
→ Make sure that the power supply voltage is within
specifications.
• Momentary power interruption has occurred.
→ Use the momentary power interruption compensation
(Set n47 so that the Inverter restarts after power is
restored)
→ Improve the power supply.
• The internal circuitry of the Inverter is damaged.
→ Change the Inverter.
%h
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 4
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