SMA SMC 4600A Installation - Manual (Page 65)

SMA Solar Technology AG Troubleshooting
Installation Manual SMC46-60A11-IA-en-81 65
Location of the Earth Fault
The approximate position of the earth fault can be determined from the ratio of the measured
voltages between the positive pole against earth potential (PE) and the negative pole against
earth potential (PE).
Example:
In this case, the earth fault is between the second and third PV modules.
☑ The earth fault check is now complete.
Result Measure
☑ You have detected an earth fault. • The installer of the PV array must remedy
the earth fault in the affected string. You can
determine the location of the earth fault as
described below.
• Do not reconnect the faulty string.
• Close and commission the inverter as
described in Section 7.3 "Closing the
Inverter" (page 51).
☑ You have not detected any earth 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 Function of the
Varistors" (page 66).