Omron SYSDRIVE 3G3JV User Manual page 182

Maintenance Operations
Fault Fault name and meaning
display
uU1
Main circuit undervoltage
(UV1)
The main circuit DC voltage
has reached the undervoltage
detection level (200 V DC for
the 3G3JV-A2j, 160 V DC for
the 3G3JV-ABj, and 400 V
DC for the 3G3JV-A4j).
%h
Radiation fin overheated
(OH)
The temperature of the
radiation fins of the Inverter
has reached 110_C ± 10_C.
Probable cause and remedy
• 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.
• 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.
Chapter 8
8-3