SMA SUNNY MINI CENTRAL 4600A Installation Manual page 72

Troubleshooting
Result
☑ You have found a ground fault.
☑ You have found no ground fault.
Location of the Ground Fault
The approximate position of the ground fault can be determined from the ratio of the measured
voltages between the positive pole against ground potential (PE) and the negative pole against
ground potential (PE).
Example:
In this case, the ground fault is between the 2nd and 3rd PV modules.
☑ The ground fault check is now complete.
72 SMC46-60A-IA-IEN120471
Measure
• The installer of the PV array 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 7.3 "Closing the
Inverter" (page 58).
It is likely that one of the thermally monitored
varistors is defective.
• Check the varistors as described in section
9.3.2 "Checking the Function of the
Varistors" (page 73).
SMA Solar Technology AG
Installation Manual