Displays and Messages SMA America, LLC
66 SB50US-80US-IA-en-36 Installation Manual
8.2 LED Fault Indicators
Ground Fault
If the yellow and red LEDs light up simultaneously, the inverter detected a ground fault. The inverter
will not restart automatically after detecting a ground fault.
• Locate the ground fault and rectify it. Observe section 9 ”Troubleshooting” (page 77).
• Then restart the inverter.
Cleared GFDI Fuse
The GFDI fuse was cleared or is not present. This fuse protects the PV plant if a ground fault is present
in the PV array.
• Locate and rectify the ground fault. Observe section 9 ”Troubleshooting” (page 77).
• Then replace the GFDI fuse. The GFDI fuse is located in the fuse holder on the inverter board.
GFDI fuse
The ground fault may also trip the GFDI fuse.
In "Turbine" mode, all GFDI fuses are deactivated.
CAUTION
Risk of fire due to incorrectly dimensioned fuse.
Risk of injury due to fire.
• Only replace faulty fuses with fuses of the same type and size.
• The Sunny Boy is shipped with a Littelfuse KLKD 1 Amp, 600 V AC/DC type fuse.
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