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
