Troubleshooting SMA Solar Technology AG
72 SMC9-11TLRP-IEN100640 Installation Guide
Shutdown Temporary inverter fault.
Corrective measures
• Contact the SMA Serviceline.
STM Timeout Internal program run fault.
Corrective measures
• If this fault occurs often, contact the SMA Serviceline.
Vac-Bfr
Vac-Srr
The grid voltage on line 2 is no longer within the permissible range
("Bfr" or "Srr" is an internal message that has no meaning for the user).
This code can be caused by any of the following conditions:
• Grid disconnected (line circuit breaker, fuse),
•AC cable is broken or
• AC cable is highly resistive.
For safety reasons, the inverter disconnects itself from the grid.
Corrective measures
• Check the grid current and grid connection on the inverter.
• If the grid voltage lies outside the acceptable range because of
local grid conditions, ask the utility operator if the voltages can be
adjusted at the feed-in point or if they agree to changes in the
values of the monitored operational limits (operating parameters:
Vac-Min and Vac-Max).
• If the grid frequency is within the tolerable range, yet "Vac-Bfr," or
"Vac-Srr" faults are still being displayed, please contact the SMA
Serviceline.
Message Description and corrective measure
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