SMA SB 1200 Installation - Manual (Page 58)

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58 SB12-17-IA-en-52 Installation Guide
Location of the ground fault
The approximate position of the ground fault can be determined from the ratio of the measured
voltages between the plus pole against ground potential and the minus pole against ground
potential (PE).
Example:
In this case, the ground fault is between the second and third PV module.
☑ The ground fault check is finished.
Result Action
☑ You have found a ground fault. • The installer of the PV generator must
remedy the ground fault in the affected
string. You can determine the location of the
ground fault as described below.
• Do not reconnect the faulty string.
• Close the inverter and commission it as
described in section 6.1 ”Commissioning
the Inverter” (page 38).
☑ You have found no ground fault. It is likely that one of the thermally monitored
varistors is defective.
• Check the varistors as described in section
9.3.2 ”Checking the Functioning of the
Varistors” (page 59).