SMA America, LLC Displays and Messages
SB50US-80US-IA-en-36 SB50US-80US-IA-en-36 67
Control System Fault
The yellow LED is continuously lit up. Operation of the Sunny Boy is permanently inhibited
The inverter no longer feeds into the power distribution grid and must be serviced by a qualified
service technician.
• Follow section 7.2 ”The Sunny Boy Does Not Resume Operation” (page 59) or contact SMA.
Grid Failure
The yellow LED lights up for 5 seconds, goes out for 3 seconds, then flashes 2 times. This sequence is
repeated 3 times. As long as a grid failure continues to be present, this flashing code will repeat itself.
The flashing code can be caused by one of the following conditions:
• Grid undervoltage (< Vac Min)
• Grid overvoltage (> Vac Max)
• Grid underfrequency (< fac Min)
• Grid overfrequency (> fac Max)
• Sudden change in the power frequency or the grid voltage
Monitor the status of the power distribution grid at the AC terminal blocks in the Sunny Boy and the
AC disconnect switch between the Sunny Boy and the power distribution grid.
DANGER
Danger to life due to high voltages in the inverter.
Risk of death or serious injury due to electric shock.
• Only qualified personnel may perform work on the inverter.
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