Internal Measurement Comparison Error

What does MSD-FAC/MSD-Idif mean?

An internal measurement comparison error has occurred in the Sunny Boy SB50US-80US-IUS094030, indicating a significant discrepancy between the values measured by the BFR (Betriebsführungsrechner) and SRR (Stromregelungsrechner) processors. This suggests an inconsistency in internal data acquisition related to frequency (FAC) or differential current (Idif).

• Discrepancy between BFR and SRR measured values for frequency (FAC).
• Discrepancy between BFR and SRR measured values for differential current (Idif).

Click steps to track your progress.

1. 1

   Measure AC grid voltage and frequency at the inverter's AC input terminals to confirm stability and compliance with specifications.

2. 2

   Inspect all DC input and AC output wiring, including ground connections, for proper termination, damage, or corrosion.

3. 3

   Verify all grid-related and safety-relevant parameters (e.g., frequency limits, voltage thresholds, ground fault settings) in the inverter's configuration.

4. 4

   Perform a controlled power cycle of the inverter (disconnect AC and DC, wait 5 min, reconnect) to clear potential transient errors.

5. 5

   Check the inverter's diagnostic logs and real-time data for specific measurement discrepancies between internal processors (BFR/SRR) if accessible via the user interface or service tool.