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SMA Solar Technology AG 10 Troubleshooting
Installation Manual SB13_21TL-IA-en-65 47
10.2.3 Errors, Disturbances, Warnings
Errors, disturbances and warnings are shown in the display and start in the first line with the word
"Error", "Fault" or "Warning". In the second line of the display, the cause of the error, fault or warning
is shown.
MPP Peak The inverter is operating in MPP mode above its nominal power.
MPP-Search The inverter is calculating the MPP.
Grid
monitoring
Grid monitoring. If irradiation is low or an error has occurred, this message
appears before the inverter is connected to the electricity grid.
Offset Offset alignment of the measurement electronics
Riso Measuring the insulation resistance of the PV plant
Disturbance The inverter has detected a disturbance. The specific disturbance message is also
displayed (see Section10.2.3 "Errors, Disturbances, Warnings", page47).
Stop Operation interrupted
V-Const Constant voltage mode.
Waiting The conditions for grid connection are not (yet) fulfilled.
Message Description and Corrective Measures
!PV-Overvoltage!
!DISCONNECT DC!
Overvoltage at the DC input. The inverter may be destroyed. This message
is additionally highlighted by rapid flashing of the backlight.
Corrective measures:
1. Disconnect the miniature circuit-breaker.
2. If there is an external DC switch-disconnector, turn it off.
3. If an ESS is in use, disconnect it.
4. Release and disconnect all DC connectors using a screwdriver
(blade width 3.5 mm).
Insert a screwdriver into one of the side slots.
–Pull the DC connectors out.
5. Check whether the DC voltage is below the maximum input voltage of
the inverter. If the DC voltage is below the maximum input voltage of
the inverter, reconnect the DC connectors to the inverter.
If the DC voltage is above the maximum input voltage of the inverter,
check the PV plant design or contact the installer of the PV array.
6. If this message recurs frequently, disconnect the inverter from voltage
sources (see Section 8) and contact the SMA Service Line.
47


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