Omron SYSDRIVE 3G3MV User Manual page 256

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