OH2 fault in an INVT GD10 drive indicates IGBT Overheat condition. This means that the temperature of the inverter's power modules has exceeded a critical threshold.

Common Causes of OH2 Faults:

1. Excessive Load:

   • Prolonged operation at high load can generate excessive heat.
   • Mechanical issues like bearing failures or belt slippage can increase the motor's load and, consequently, the inverter's load.

2. Poor Ventilation:

   • Obstructed airflow to the inverter's cooling fans can impede heat dissipation.
   • Dust accumulation on the heat sink can reduce its efficiency.

3. Environmental Factors:

   • High ambient temperature can exacerbate the heat dissipation problem.
   • Direct sunlight or exposure to heat sources can increase the inverter's operating temperature.

4. Internal Component Failure:

   • Faulty power modules or other internal components can generate excessive heat.

Troubleshooting Steps:

1. Check the Load:

   • Ensure the load on the motor is within its rated capacity.
   • Verify the mechanical condition of the driven equipment.

2. Inspect the Inverter's Ventilation:

   • Clean the inverter's cooling fans and heat sink to remove dust and debris.
   • Ensure proper airflow to the inverter.

3. Check the Ambient Temperature:

   • Avoid operating the inverter in excessively hot environments.
   • Consider using additional cooling measures like fans or air conditioning.

4. Verify Internal Components:

   • Inspect the power modules and other components for signs of damage or overheating.
   • Consult the inverter's manual for specific diagnostic procedures.