SMA Solar Technology AG Failure Search
Installation Guide SMC6-8TL-IEN101040 67
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 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 provider if the voltage can be
adjusted at the feed-in point or if it would 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
VpvMax Overvoltage at DC input. The inverter may be damaged.
Corrective measures
Immediately disconnect the inverter from the grid.
1. Turn off the line circuit breaker.
2. Remove the Electronic Solar Switch.
3. Disconnect all the DC plug connectors.
4. Check DC voltage:
– If the DC voltage exceeds the maximum input voltage, check the
plant design or contact the person who installed the PV
generator.
– If the DC voltage is under the maximum input voltage, reconnect
the inverter to the PV generator as described in section
5.4.4”Connecting the PV Generator (DC)” (page34).
If the message occurs again, disconnect the inverter again and contact
the SMA Serviceline (see section 13”Contact” (page85)).
UZWK-Max The internal hardware monitor has detected an overvoltage condition in
the intermediate circuit of the inverter.
Corrective measures
• If this fault occurs often, contact the SMA Serviceline
Message Description and corrective measure
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