SMA SUNNY BOY 1600TL, Installation Manual

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50 SB16_21TL-IA-IEN112351 Installation Guide
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)" (page 24). If required, re-tighten the screws
on the AC terminals.
• If this fault recurs, contact the SMA Serviceline.
Message Description and Corrective Measure