SMA SUNNY BOY - Manual (Page 15)

SMA Solar Technology AG Operating Modes
User Manual SB_SMC-BEN092840 15
3.4 Failures
A distinction is made between critical and non-critical failure messages.
Thanks to a comprehensive safety concept the number of critical conditions that can occur has been
reduced to one single situation:
PV generator voltage is too high.
This is indicated by the following blink code on the yellow LED:
The yellow fault LED lights up for 5 seconds when the fault occurs, and then starts emitting the
following blink code: 3 seconds off and then 4 brief consecutive blinks. This code is emitted 3 times
in succession. If this fault is still present, the fault signal starts over again.
Non-Critical Failure Conditions
All other display codes indicate some form of fault condition which is not usually dangerous to people
or equipment, but which should nevertheless be investigated and corrected without delay.
Despite all precautions, it is possible that other faults may occur which cannot be signaled (e.g. failure
of the status display). In order to detect such faults, the system operator should use the explanations
in the following section to check the plausibility of the displayed mode (e.g. an illuminated green LED
in the dead of night indicates a defect, just as does a non-illuminated LED on a sunny day).
More detailed diagnoses are possible using the communications options detailed in Section
6 "Measurement Channels and Messages" (page 28).
NOTICE!
DC input voltage too high. Destruction of the inverter.
• Contact your installer, who will immediately disconnect the PV generator from the
inverter and check the DC voltage, as described in the inverter's installation guide.
Generator Failure
The same blink code is generated when a generator failure occurs. This falls into the
category of a non-critical failure which is dealt with in more detail in Section 3.4.6 "The
yellow LED blinks 4 times" (page 20).