SMA America, LLC 5 Troubleshooting
User Manual SB6-11TLUS-BA-eng-BUS121211 31
REL_INV_OPEN
REL_GRID_OPEN
A grid relay does not open. The inverter checks the relays connecting it to
the power distribution grid before feeding power into the grid.
If the grid relays do not function properly, the inverter cannot connect to
the power distrubution grid.
Corrective measures:
• Contact installer.
Riso The electrical insulation between the PV plant and ground is defective.
The resistance between the positive and negative DC connection to
ground is outside the permissible range. The inverter disconnects from the
power distribution grid.
Corrective measures:
• Contact installer.
Riso-Sense Insulation measurement failed.
The inverter disconnects from the power distribution grid. As soon as the
error has been remedied, the inverter tries to feed into the power
distribution grid again. If the inverter cannot feed into the power
distribution grid after several attempts, the inverter trips the permanent
operation inhibition.
Corrective measures:
• Contact installer.
ROM The internal test of the inverter control system firmware failed.
The inverter disconnects from the power distribution grid. As soon as the
error has been remedied, the inverter tries to feed into the power
distribution grid again. If the inverter cannot feed into the power
distribution grid after several attempts, the inverter trips the permanent
operation inhibition.
Corrective measures:
• If the message occurs frequently, contact the installer.
SD-DI-Conv The inverter has detected an insulation fault on the DC side.
The inverter disconnects from the power distribution grid. As soon as the
error has been remedied, the inverter tries to feed into the power
distribution grid again. If the inverter cannot feed into the power
distribution grid after several attempts, the inverter trips the permanent
operation inhibition.
Corrective measures:
• Contact installer.
Message Cause and corrective measures
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