Micro-controller Communication Failure

What does Bfr-Srr mean?

Communication between the BFR (Betriebsführungsrechner - Sequential Control System) and SRR (Stromregelungsrechner - Current Control System) micro-controllers is failing in the Sunny Boy SB50US-80US-IUS094030. This indicates an internal communication problem within the inverter.

• Internal communication failure between sequential control system (BFR) and current control system (SRR).

Click steps to track your progress.

1. 1

   Verify current status and any additional diagnostic messages displayed on the inverter's screen or via the monitoring interface.

2. 2

   Perform a full power cycle of the inverter by safely disconnecting both DC and AC power, waiting at least 5 minutes, and then reconnecting.

3. 3

   Review the inverter's internal event log for specific sub-codes or patterns related to the BFR-SRR communication failure.

4. 4

   Check the inverter's currently installed firmware version and compare it with the latest recommended version from SMA for potential updates.

5. 5

   Measure the incoming DC voltage from the PV array and the outgoing AC voltage at the inverter's output terminals to confirm they are within specified operating limits.