Failure Search SMA Solar Technology AG
50 SB13_21TL-IA-IEN121060 Installation Guide
Vac-Bfr
Vac-Srr
The grid voltage is no longer within the permissible range ("Bfr" or "Srr" is
an internal message of no relevance for the user). This fault can be
caused by any of the following conditions:
• Grid disconnected (miniature 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 voltage and connection on the inverter.
• If the grid voltage lies outside the acceptable range because of
local grid conditions, ask the network 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 voltage is within the tolerable range but the "Vac-Bfr" or
"Vac-Srr" errors are still being displayed, contact the SMA
Serviceline.
Vpv-Max Overvoltage at DC input. The inverter could be damaged.
Corrective measures
Immediately disconnect the inverter from the grid.
1. Turn off the miniature circuit-breaker.
2. If an external DC switch-disconnector is available, disconnect it.
3. If an Electronic Solar Switch is installed, remove it.
4. Disconnect all the DC connectors.
5. Check the DC voltage:
– If the DC voltage is above the maximum input voltage, check the
plant design or contact the PV array installer.
– If the DC voltage is below the maximum input voltage,
reconnect the inverter to the PV array as described in section
5.4"Connecting the PV Array (DC)" (page29).
If the message reappears, disconnect the inverter again and contact the
SMA Serviceline (see section 13"Contact" (page72)).
Vinternal The internal hardware monitor has detected an overvoltage condition in
the intermediate circuit of the inverter.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Message Description and Corrective Measure
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