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3. Repeat step 2 for each string.
4. The table illustrated below shows the various results and corresponding measures.
Result
You have found a ground fault.
You have found no ground fault.
9.1.2 Checking the Function of the Varistors
Varistors are wearing parts. Their functioning becomes restricted through aging or due to repeated
responses as a result of overvoltages. It is therefore possible that one of the thermallly monitored
varistors has lost its protective functioning, and thus the red LED is permanently lit.
Position of varistors
The position of the varistors are to be determined with the help of the diagram below.
Observe the following allocation of the terminals:
• Terminal A: outer terminal
(varistor connection with crimp)
• Terminal B: middle terminal
• Terminal C: outer terminal
(varistor connection without crimp)
You can check the functioning of the varistors in the following manner:
1. Open the Sunny Boy as described in section 7.1 "Opening the Sunny Boy" (page 29).
Installation Guide
Measure
• The installer of the PV generator must remedy the
ground fault in the affected string before you may
reconnect the string to the Sunny Boy.
• Do not reconnect the faulty string.
• Close the Sunny Boy and operate as described in
section 7.2 "Closing the Sunny Boy" (page 30).
It is likely that one of the thermally monitored varistors is
defective.
• Check the varistors as described in section
9.1.2 "Checking the Function of the Varistors"
(page 33).
SB3300TLHC-IEN094121
Troubleshooting
33
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