AC Overload

What does F63 mean?

This Escalating Automatic Fault occurs due to an excessive load on the AC output. If triggered 3 times in 5 minutes, it becomes a manual fault, indicating the inverter's capacity is being consistently exceeded.

• Total connected AC load (e.g., sum of motor drives, heaters, lighting) exceeds the inverter's maximum continuous AC output power rating.
• High inrush current from inductive loads (e.g., motors, transformers) upon startup or during switching events.
• Short circuit or ground fault on the AC output wiring downstream of the inverter causing excessive current draw.
• Incorrectly set overload protection parameters (e.g., P2-10 'Overload Trip Current' or P2-11 'Overload Delay Time') in the inverter.
• Failure of an internal current sensing circuit within the inverter, leading to false overload detection.

Click steps to track your progress.

1. 1

   1. Measure the total current drawn from the AC output terminals (L1, L2, L3) using a clamp meter under normal operating conditions.

2. 2

   2. Reduce the number of active loads connected to the inverter's AC output to ensure the total power consumption is below the inverter's rating.

3. 3

   3. Inspect AC output wiring and connected loads for any signs of short circuits or ground faults, checking resistance between phases and phase-to-ground.

4. 4

   4. Review and adjust inverter's AC overload protection parameters (e.g., P2-10, P2-11) according to connected load characteristics and inverter specifications.

5. 5

   5. Implement soft starters or variable frequency drives (VFDs) for high-inrush inductive loads to mitigate peak current demands.