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10 Troubleshooting SMA Solar Technology AG
50 SB13_21TL-IA-en-65 Installation Manual
K1-Close
K1-Open
K2-Open
Error during relay test.
Corrective measures:
Contact the SMA Service Line if this disturbance occurs frequently or
several times in a row.
MSD-dI
MSD-Fac
MSD-Vac
MSD-Timeout
Internal measurement comparison fault or hardware defect.
Corrective measures:
If this message is displayed frequently, contact the SMA Service Line.
Offset Error in measurement data capture
Corrective measures:
If this message is displayed frequently, contact the SMA Service Line.
Riso The electrical insulation between the PV plant and earth is defective.
The resistance between the positive and negative DC connection to earth is
outside the permissible range.
Corrective measures:
Ensure that the PV plant is insulated correctly.
Check the PV array for earth faults (see Section 10.5.1).
ROM The inverter firmware is faulty.
Corrective measures:
If this message is displayed frequently, contact the SMA Service Line.
Shut-Down Temporary inverter disturbance.
Corrective measures:
Contact the SMA Service Line.
STM Timeout Internal program run disturbance.
Corrective measures:
If this message is displayed frequently, contact the SMA Service Line.
Message Description and Corrective Measures
50


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