Micro-controller Communication Failure
SMA · SUNNY BOY 5000US-8000US Solar Inverter
¿Qué significa Bfr-Srr ?
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.
Causas comunes
- Internal communication failure between sequential control system (BFR) and current control system (SRR).
Pasos de reparación & Lista de verificación
Haga clic en los pasos para seguir su progreso.
- 1
Verify current status and any additional diagnostic messages displayed on the inverter's screen or via the monitoring interface.
- 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
Review the inverter's internal event log for specific sub-codes or patterns related to the BFR-SRR communication failure.
- 4
Check the inverter's currently installed firmware version and compare it with the latest recommended version from SMA for potential updates.
- 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.