Cause : Overtemperature heat sink AC inverter comes when the temperature of the power unit heat sink has exceeded the permissible limit value due to insufficient cooling, fan failure, overload, ambient temperature too high, pulse frequency too high.

Siemens fault 30004 indicates an overtemperature condition in the power unit heat sink of an AC inverter, specifically the Sinamics series drive. Here's a breakdown of the issue and troubleshooting steps:

Cause of Fault 30004:

The fault signifies that the heat sink, which is responsible for dissipating heat generated by the inverter during operation, is exceeding its safe temperature limit. This can happen due to several reasons:

1. Insufficient Cooling: The most common cause is inadequate cooling. This could be due to:

• Blocked air vents or filters on the inverter housing.
• Faulty cooling fan not circulating air properly.
• Ambient temperature exceeding the inverter's specified operating range.

2. Overload: If the inverter is overloaded and working beyond its rated capacity for an extended period, it can generate excessive heat, exceeding the heat sink's ability to dissipate it.

3. Component Failure: Less likely, a malfunction within the inverter's power unit itself could lead to abnormal heat generation.

Troubleshooting Steps:

1. Check Cooling System:

• Visually inspect the inverter housing for any blocked air vents or dust buildup on filters. Clean any blockages to ensure proper airflow.
• Verify that the cooling fan is functioning correctly. The fan should be spinning freely and not making any unusual noises.

2. Verify Ambient Temperature:

• Ensure the ambient temperature surrounding the inverter is within the operating range specified in the Siemens manual for your specific drive model. If the environment is too hot, consider additional cooling measures like air conditioning or relocating the inverter to a cooler area (if possible).

3. Review Load Conditions:

• Analyze the current load on the motor connected to the inverter. If it's consistently exceeding the inverter's rated capacity, you might need to adjust the motor load or upgrade the inverter to a higher capacity model.