Omron SYSDRIVE 3G3EV User Manual page 62

Operation
Data
display
uU1
Main circuit undervoltage (UV1)
The DC voltage of the main circuit
dropped below the specified level.
3G3EV-A2jjj: Approximately 200 V
or less
3G3EV-ABjjj: Approximately
160 V or less
3G3EV-A4jjj-CUE: Approximately
400 V or less
uU2
Control power supply fault (UV2)
A voltage fault occurred in control
power supply.
%h
Radiation fin overheated (OH)
The radiation fin overheated because
of ambient temperature rise or Inverter
temperature rise due to overload.
Description Cause and action
• The input power voltage dropped.
• Open-phase occurred.
• An instantaneous power interruption
occurred.
• Check the power voltage.
• Check the power input line for discon-
nection.
• Check the terminal block screws for
looseness.
• Turn the power off, then on.
• If this problem persists, replace the
Unit.
• Load is excessive.
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.
Chapter 5
5-5