Operation
Chapter 5
Data
Description
Cause and action
display
uU1
Main circuit undervoltage (UV1)
• The input power voltage dropped.
• Open-phase occurred.
The DC voltage of the main circuit
dropped below the specified level.
3G3EV-A2jjj: Approximately 200 V
or less
• An instantaneous power interruption
occurred.
3G3EV-ABjjj: Approximately
160 V or less
3G3EV-A4jjj-CUE: Approximately
400 V or less
• Check the power voltage.
• Check the power input line for discon-
nection.
• Check the terminal block screws for
looseness.
Control power supply fault (UV2)
• Turn the power off, then on.
uU2
%h
A voltage fault occurred in control
power supply.
• If this problem persists, replace the
Unit.
Radiation fin overheated (OH)
• Load is excessive.
The radiation fin overheated because
of ambient temperature rise or Inverter
temperature rise due to overload.
Reduce the load.
• The V/f characteristics are inappropri-
ate.
Reset constant Nos. 24 to 26.
• The acceleration/deceleration time or
cycle time is too short.
Increase the acceleration/de-
celeration time or cycle time.
• The ambient temperature is too high.
Install a cooling fan or air con-
ditioner.
5-5
OMRON [ OMRON ELECTRONICS LLC ]
