DC Over Voltage

What does F49 mean?

This Escalating Automatic Fault occurs if the DC voltage exceeds the High Battery Cut Out (HBCO) setting. It can also be triggered if batteries are disconnected at the DC breaker while the XW Pro is charging, leading to potential overcharging or damage to connected equipment.

• Overcharging from a connected source (e.g., solar array, rectified generator) due to charge controller malfunction or incorrect settings (e.g., P4-05 'Bulk Voltage' too high).
• Sudden disconnection of the battery bank while a charging source is active, causing voltage surge on the DC bus.
• Faulty DC voltage sensing circuit on the inverter control board reporting erroneously high voltage.
• High Battery Cut Out (HBCO) parameter (e.g., P3-11) set too low for the connected battery bank's float or absorption voltage.
• Regenerative braking feedback from a connected motor drive without adequate braking resistor or regeneration absorption.

Click steps to track your progress.

1. 1

   1. Measure actual DC bus voltage at the inverter's DC input terminals (e.g., DC+ and DC-) using a calibrated multimeter.

2. 2

   2. Verify the settings of connected charging sources (e.g., solar charge controller, AC-DC converter) for output voltage limits (e.g., bulk, absorption, float voltage parameters).

3. 3

   3. Confirm all DC breakers between the inverter and battery bank are closed and connections are secure to prevent accidental disconnections.

4. 4

   4. Review inverter parameter (e.g., P3-11 or 'High Battery Cut Out') and adjust if necessary, ensuring it aligns with battery manufacturer's overcharge protection recommendations.

5. 5

   5. Inspect DC bus capacitors for bulging or leakage, which may indicate a fault in voltage regulation.