OMRON 3G3MV Inverter Practical Guide

2. Warning (non fatal error, indicator light flashing)

Reason for displaying name and countermeasures

Uu (flashing) main circuit undervoltage power supply voltage low or phase loss check power supply

Ou (flash) overvoltage, high power supply voltage, reduced power supply voltage

Overheating of OH (flash) radiator and OH fault, but did not reach the trip value to improve ventilation

CAL communication standby did not receive normal DSR message. Check the communication line and master station program

OP1-OP5 parameter settings are incorrect, multifunctional input is repeated, V/f conditions are not met, upper and lower limits are reversed, frequency hopping sequence is incorrect, and the parameters are checked and corrected

OL3 (flashing) over torque detection mechanical jamming or over torque inspection mechanical system; Increase the setting value of n098/n099

BB external base block multifunctional input receives BB command to exclude BB signal

EF (flash) forward and reverse, input forward and reverse commands simultaneously, and turn on for more than 0.5 seconds. Check the timing

STP (flashing) emergency stop operator STOP key or emergency stop input action reset and restart

FAN cooling fan malfunction: Fan stuck or poorly wired. Check the fan and replace it if necessary

3. Fault reset method

Connect the multifunctional input (set to 5).

Press the STOP/RESET button on the numeric operator (with the RUN command set to OFF).

Disconnect the power supply of the main circuit and wait for the CHARGE light to turn off before powering it back on.

Note: If the command is in the ON state, the reset signal will be ignored.

Maintenance and replacement of spare parts

1. Regular inspection items

Check if the terminal screws are loose and if the radiator has accumulated dust.

Confirm that the cooling fan is running normally without any abnormal noise.

Clean the interior with dry compressed air (4-6kg/cm ²).

The lifespan of electrolytic capacitors is closely related to the operating environment temperature, and the lifespan is approximately doubled for every 10 ° C decrease.

2. Cooling fan replacement

The 3G3MV fan is located under the radiator. Replacement steps:

Remove the front cover and bottom cover.

Press the left and right sides of the fan cover and lift it up to remove the fan.

Unplug the fan connector (CN4 or CN10, depending on the model) and remove the wire protection tube.

Replace the fan with a new one, ensuring that the wind direction is towards the heat sink (exhaust outward).

Reconnect and reinstall the connector.

3. Parameter replication and validation

By using the built-in EEPROM of the digital controller, parameters can be copied between frequency converters of the same specifications. Operation:

Set n177=1 (read allowed).

Set n176=rEd (read frequency converter parameters to the operator).

Connect the target frequency converter and set n176=Cpy (write).

Using vFy can compare parameter differences.

Parameters that cannot be copied: n176, n177, n178 (fault log), n179 (software number), as well as n011-n017, n036, n080 between different capacities.