What to do if Omron Inverter shows OC Over Current?
M
Mr. Matthew SmithAug 17, 2025
If your Omron Inverter displays an OC Over Current error, it could be due to several reasons: a shorted Inverter output phase-to-phase, a shorted motor, a locked rotor, too heavy of a load, acceleration/deceleration time being too short, a contactor on the Inverter output opening or closing, using a special motor, or using a motor with a rated current larger than the Inverter’s output current. Try removing the motor and running the Inverter without it. You can also check the motor for a phase-to-phase short, verify the acceleration/deceleration times, and check the Inverter for a phase-to-phase short at the output.
E
Emily JacksonAug 20, 2025
What to do if Omron VARISPEED L7 displays GF Ground Fault?
M
Mr. Sean WintersAug 20, 2025
If you're seeing a GF Ground Fault error on your Omron Inverter, it could be due to one of the Inverter outputs being shorted to ground, a defective DCCT, or the output contactor opening when the inverter output was still active. Remove the motor and run the Inverter without it. Also, check the motor for a phase to ground short. Verify the DCCT reading by checking the output current with a clampmeter. Finally, check the control sequence for wrong motor contactor signals.
W
William ShermanAug 23, 2025
What to do if Omron VARISPEED L7 displays OV DC Bus Overvolt?
K
Kelly KeyAug 23, 2025
If your Omron Inverter is showing an OV DC Bus Overvolt error, it could be because the deceleration time is set too short, causing the regenerative energy from the motor to be too large. Increase the deceleration time or connect a braking option. Also, check if the power supply voltage is too high and decrease it to meet the inverter’s specifications. Finally, check the braking chopper/resistor to ensure they are working correctly.
G
griversAug 26, 2025
What to do if Omron Inverter displays OL1 Motor Overload?
D
Donald BrownAug 26, 2025
If your Omron Inverter shows an OL1 Motor Overload error, it might be due to a load that is too large, acceleration/deceleration times that are too short, or cycle times that are too short. Recheck the cycle time, the size of the load, and the acceleration/deceleration times. Also, check the V/f characteristics if the voltage settings of the V/f pattern is incorrect. Finally, verify that the setting of Motor Rated Current is correct.
T
Teresa BensonAug 28, 2025
What to do if Omron VARISPEED L7 Inverter displays PUF DC Bus Fuse Open?
L
Laura CooperAug 28, 2025
If your Omron Inverter displays a PUF DC Bus Fuse Open error, it could be due to shorted output transistors or terminals. Check the motor and motor cables for short circuits or insulation failures. After correcting the fault, replace the inverter.
J
Julie CampbellAug 31, 2025
Why does Omron VARISPEED L7 Inverter show UV1 DC Bus Undervolt?
S
Sarah ClarkAug 31, 2025
The UV1 DC Bus Undervolt error on your Omron Inverter can be caused by voltage fluctuations in the power supply that are too high. Check the input voltage. Also, check the wiring of the input terminals and extend the settings.
B
Brendan HamiltonSep 3, 2025
What to do if Omron VARISPEED L7 displays OH Heatsink Overtemp?
S
Sandra RobertsSep 3, 2025
If your Omron Inverter displays an OH Heatsink Overtemp error, the temperature may be too high. Check for dirt build-up on the fans or heatsink. Reduce the ambient temperature around the drive. If needed, replace the cooling fan(s).
S
Sheila OwenSep 6, 2025
What does it mean when Omron VARISPEED L7 displays UV2 CTL PS Undervolt?
R
Rachel HaleSep 6, 2025
If your Omron Inverter displays a UV2 CTL PS Undervolt error, it indicates that an external load was pulling down the Inverter’s power supplies, or there was an internal short in the power/gate drive board. Remove all connections to the control terminals and cycle the power to the Inverter. If the issue persists, replace the Inverter.
Y
ymeltonSep 8, 2025
What to do if Omron VARISPEED L7 displays OS Overspeed Det?
K
Kathy MaloneSep 8, 2025
If your Omron Inverter displays an OS Overspeed Det error, it could be due to overshooting/undershooting. Adjust the ASR settings. Also, check the reference circuit and reference gain if the reference was too high. Check the settings.
S
sharon41Sep 12, 2025
What does it mean if Omron VARISPEED L7 Inverter displays Ext Run Active Cannot Reset?
N
Nicholas JohnsonSep 12, 2025
The 'Ext Run Active Cannot Reset' error on your Omron Inverter means that the RUN command has not been removed and a RESET command is input by digital input or by the RESET button on the digital operator, or the fault was tried to be reset when a direction signal (Up/Down) was still active. Remove the RUN signal first and reset the error. Remove the direction signal and retry to reset the fault. If the fault reset is handled by a PLC, check the sequence.
Omron VARISPEED L7 Specifications
General
Cooling Method
Forced air cooling
Type
VARISPEED
Output Frequency
0 to 400 Hz
Control Method
V/f control, Sensorless vector control
Overload Capacity
150% for 60 seconds
Communication
Modbus RTU
Protection Functions
Overcurrent, overvoltage, undervoltage, overload, overheating, short circuit
To Next Page
General
