An LL fault in INVT GD10 drive indicates an Electronic Underload Fault. This means that the inverter's output current has fallen below a pre-set underload threshold.

Common Causes of LL Faults:

1. Reduced Load:

   • The load connected to the motor may have decreased significantly or been removed entirely.
   • This can occur due to mechanical failures, process changes, or other factors.

2. Incorrect Underload Threshold Setting:

   • The underload threshold may be set too low, causing frequent false alarms.
   • Check the drive's parameter settings and adjust the underload threshold as needed.

3. Inverter Malfunction:

   • A fault in the inverter's internal circuitry can trigger an LL fault, even if the load is sufficient.

Troubleshooting Steps:

1. Check the Load:

   • Verify that the load connected to the motor is appropriate and functioning correctly.
   • Ensure that the load is not significantly reduced or removed.

2. Adjust Underload Threshold:

   • Consult the drive's manual to determine the correct underload threshold setting.
   • Adjust the setting to avoid false alarms.

3. Inspect the Inverter:

   • Visually inspect the inverter for any signs of damage or overheating.
   • Check the connections and wiring for any loose or damaged components.