Capacitor Over Temperature

What does F45 mean?

This Automatic Fault signifies a capacitor over-temperature shutdown at 105 °C, safeguarding internal components from overheating. The fault clears automatically when the capacitor temperature drops to 105 °C.

• Inadequate cooling or restricted airflow to the inverter's internal capacitor bank.
• Excessive ripple current flowing through the DC-link capacitors due to heavy loads or harmonic distortion on the AC side.
• High ambient temperature within the inverter enclosure or equipment cabinet.
• Aging or failing DC-link capacitors exhibiting increased Equivalent Series Resistance (ESR), leading to greater heat dissipation.
• Faulty temperature sensor specifically monitoring the capacitor bank.

Click steps to track your progress.

1. 1

   Verify the operation of all cooling fans within the inverter enclosure by checking fan rotation and airflow at exhaust vents.

2. 2

   Clean air filters and ensure sufficient clearance around the inverter for proper heat dissipation (e.g., 100mm on all sides).

3. 3

   Measure the ambient temperature inside the inverter enclosure and compare it to the specified operational range (e.g., max 50°C).

4. 4

   Inspect the capacitor bank for visual signs of bulging, leaking electrolyte, or discoloration, indicating capacitor degradation.

5. 5

   Monitor the DC bus voltage and ripple amplitude using an oscilloscope to detect excessive ripple current that could cause overheating.