SMA Solar Technology AG Troubleshooting
Installation Guide SB33_38-IEN111851 53
9.2 Error Messages
When a disturbance occurs, the inverter generates a message which depends on the operating mode
and the type of the detected disturbance.
Message Description and Corrective Measure
!PV-Overvoltage!
!DISCONNECT DC!
Overvoltage at DC input.
Overvoltage can destroy the inverter.
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 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 below the maximum input voltage,
reconnect the inverter to the PV generator as described in
section 5.5.4”Connecting the PV Generator (DC)” (page33).
If the message appears again, disconnect the inverter again and contact
the SMA Serviceline (see section 13”Contact” (page73)).
ACVtgRPro The 10-minute-average grid voltage is no longer within the permissible
range. This can be caused by either of the following:
• The grid voltage at the connection point is too high.
• The grid impedance at the connection point is too high.
The inverter disconnects to assure compliance with the voltage quality of
the grid.
Corrective measures
Check the grid voltage at the connection point of the inverter:
• If, due to the local grid conditions, the grid voltage is 253 V or
more, ask the electric power company whether the voltage at the
feed-in point can be adjusted, or whether it would agree to an
alteration of the limit value of the ACVtgRPro parameter for voltage
quality monitoring.
• If the grid voltage is continually within the acceptable range, and
this error is still displayed, contact the SMA Serviceline.
Bfr-Srr Internal measurement comparison fault or hardware defect.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
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