Omron SYSDRIVE 3G3EV SERIES User Manual page 69

Data
display
Overcurrent (OC)
The Inverter output current
instantaneously exceeded 250% of the
rated amperage.
Main circuit overvoltage (OV)
Because regenerative energy from the
motor was excessive, the DC voltage
of the main circuit exceeded
approximately 410 V.
Main circuit undervoltage (UV1)
The DC voltage of the main circuit
dropped below the specified level.
3G3EV-A2
Approximately 200 V or less
3G3EV-AB
Approximately 160 V or less
Control power supply fault (UV2)
A voltage fault occurred in control
power supply.
Description
R:
R:
Cause and action
The output side of the Inverter is
shorted or grounded.
Load inertia is excessive.
The acceleration and deceleration
time settings are too short.
A special motor is used.
The motor was started during free
running.
The magnetic contactor on the output
side of the Inverter was opened and
closed.
Determine the cause of the error, take
the necessary action, and reset the
system.
The deceleration time setting is too
short.
Increase the deceleration time.
Connect a braking resistor (or braking
resistor unit).
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.
Chapter 5