Omron SYSDRIVE 3G3MV

8-11
8-1-2 Warning Detection (Nonfatal Error)
ThewarningdetectionisatypeofInverterprotectivefunctionthatdoesnot
operatethefaultcontactoutputandreturnstheInvertertoitsoriginalstatus
once the cause of the error has been removed. The Digital Operator
flashes and display the detail of the error. If a warning occurs, take
appropriate countermeasures according to the table below.
Note Some warnings or some cases stop the operation of the Inverter as
described in the table.
H Warning Displays and Processing
Fault
display
Fault name and Meaning Probable cause and remedy
uU
(flashing)
Main circuit undervoltage
(UV)
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 line is disconnected.
® Check the above and take necessary
countermeasures.
· Incorrect power supply voltage
® Make sure that the power supply
voltage is within specifications.
OU
(flashing)
Main circuit overvoltage
The main circuit DC voltage has
reached the overvoltage
detection level (410 VDC for
200-V Inverters, 820 VDC for
400-V Inverters).
· The power supply voltage is too high.
® Decrease the voltage so it will be
within specifications.
OH
(flashing)
Radiation fin overheated (OH)
The temperature of the
radiation fins of the Inverter has
reached 110_C ± 10_C.
· The ambient temperature is too high.
® Ventilate the Inverter or install a
cooling unit.
OH3
(flashing)
Warning/Fault contacts do
not change state.
OH3 (Inverter overheating
pre-alarm)
OH3 signal is input.
· Release the input of inverter overheating
pre-alarm signal.
Maintenance Operations Chapter 8