SMA Solar Technology AG Failure Search
Installation Guide SB13_21TL-IA-IEN121060 47
9.2 Error Messages
When an error occurs, the inverter generates a message which depends on the operating mode and
the type of the detected error.
Message Description and Corrective Measure
!PV Overvoltage!
!DISCONNECT DC!
Overvoltage at DC input.
Overvoltage can destroy the inverter.
Corrective measures
Disconnect the inverter from the grid immediately.
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)).
Bfr-Srr Internal measurement comparison fault or hardware defect.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Fault current
dI-Srr
The inverter has detected a drastic change in the differential current. The
integrated differential current monitoring system plays an important part
in ensuring personal safety.
A drastic change in the differential current can be caused by a sudden
ground fault, residual current or an actual fault in the device. The inverter
disconnects from the grid.
Corrective measures
• If the "dl-Bfr" or "dl-Srr" message appears for no apparent reason,
check the plant for correct insulation and a possible ground fault,
as described in section 9.3.1"Checking the PV Array for a Ground
Fault" (page52).
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