Omron SYSDRIVE 3G3MV A2002, User Manual

Page: 256 / 348

8-3
Fault
display
Probable cause and remedy Fault 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-A2
j
, 160 VDC
for the 3G3MV-AB
j
, and
400 VDC for the
3G3MV-A4
j
).
·
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