SMA Solar Technology AG Troubleshooting
Installation Guide SB33_38-IEN111851 55
Imax / overcurrent Overcurrent on the AC side. This message is displayed if the current on
the AC grid is larger than specified.
Corrective measures
• Check the plant design and grid conditions.
K1-Close
K1-Open
Error during relay test.
Corrective measures
• Contact the SMA Serviceline if this problem occurs often or several
times in succession.
MSD-Fac Internal measurement comparison fault or hardware defect.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
MSD-Vac Internal measurement comparison fault or hardware defect.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
MSD-Timeout Internal measurement comparison fault or hardware defect.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
MSD-Zac Internal measurement comparison fault or hardware defect.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Offset The "Offset" operating condition is a normal operating condition that
occurs prior to grid monitoring.
If "O-ffset" is displayed as an error, then there is a disturbance in the data
logging.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Riso The electrical insulation of the PV plant against ground is faulty. The
resistance between the DC plus and/or DC minus connection and ground
is outside the defined limit range.
Corrective measures
• Check the plant insulation.
• Check the plant for ground faults as described in section
9.3.1”Checking the PV Generator for a Ground Fault” (page58).
ROM The inverter firmware is faulty.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Message Description and Corrective Measure
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