SMA Solar Technology AG Failure Search
Installation Guide SB13_21TL-IA-IEN121060 51
Watchdog Internal program run fault.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Zac-Bfr
Zac-Srr
The grid impedance is no longer within the permissible range ("Bfr" or
"Srr" is an internal message of no relevance for the user). For safety
reasons, the inverter disconnects itself from the grid. The impedance is
calculated from both the grid impedance and the impedance of the
power supply line cable (AC cable) of the inverter.
Corrective measures
• Check the grid impedance and grid connection on the inverter.
• Use an AC cable with an adequate diameter (= low impedance) as
described in section 5.2.2"Connecting the Inverter to the Power
Distribution Grid (AC)" (page24). If required, re-tighten the screws
on the AC terminals.
• If this fault recurs, contact the SMA Serviceline.
Message Description and Corrective Measure
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