OC3 fault in INVT GD10 drive indicates an overcurrent fault during constant speed operation. This means the motor is drawing more current than the drive can handle while running at a steady speed.

Common Causes:

1. Mechanical Overload: The motor may be overloaded due to excessive mechanical load or friction.
2. Incorrect Motor Parameter Settings: If the motor parameters are not configured correctly, the drive may miscalculate the required current.
3. Power Supply Issues: Insufficient power supply or voltage fluctuations can also trigger the OC3 fault.
4. Internal Drive Faults: In rare cases, internal faults within the drive itself can trigger the OC3 fault.

Troubleshooting Steps:

1. Check Mechanical Load:
   • Ensure that the motor shaft rotates freely and there are no mechanical obstructions.
   • Check for any binding or excessive friction in the mechanical system.
2. Verify Motor Parameters:
   • Ensure that the motor's rated power, voltage, and current are correctly entered in the drive's parameter settings.
   • Consult the motor's nameplate for accurate values.
3. Check Power Supply:
   • Verify that the power supply voltage and current are within the specified range.
   • Ensure that the power supply is capable of delivering the required power to the drive.
4. Check for Internal Faults:
   • If the above steps do not resolve the issue, it may be necessary to inspect the drive's internal components.