OH1 fault in an INVT GD10 drive indicates Overheat condition. This means that the internal components of the drive, such as the power modules or heat sink, have exceeded their maximum allowable temperature.

Common Causes of OH1 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.