8-3
Fault
display
Probable cause and remedyFault name and
meaning
OU Overvoltage (OV)
The main circuit DC
voltage has reached the
overvoltage detection
level (410 VDC for 200-V
Inverters, 820 VDC for
400-V Inverters)
· There is excessive regenerative energy with no
braking resistor or Braking Resistor Unit con-
nected.
® Connect the Braking Resistor Unit or a braking
resistor.
® Increase the deceleration time.
· The regenerative energy has not been processed
though a braking resistor or Braking Resistor Unit.
® Set n092 for stall prevention during
deceleration to 1 (disable)
· The braking resistor or Braking Resistor Unit is not
wired properly.
® Check and correct the wiring.
· The power supply voltage is too high.
® Decrease the voltage so it will be within
specifications.
· There is excessive regenerative energy due to
overshooting at the time of acceleration.
® Suppress the overshooting as much as
possible.
· The braking transistor is damaged.
® Change the Inverter.
uU1 Main circuit
undervoltage (UV1)
The main circuit DC
voltage has reached the
undervoltage detection
level (200 VDC for the
3G3MV-A2j, 160 VDC
for the 3G3MV-ABj, and
400 VDC for the
3G3MV-A4j).
· Power supply to the Inverter has phase loss,
power input terminal screws are loose, or the
power cable is disconnected.
® 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 n081 so that the Inverter
restarts after power is restored)
® Improve the power supply.
· The internal circuitry of the Inverter is damaged.
® Change the Inverter.
Maintenance Operations Chapter 8
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