SMA STP 10000TL-10 Installation - Manual (Page 84)

12 Troubleshooting SMA Solar Technology AG
84 STP10-17TL-IA-en-32 Installation Manual
☑ An earth fault is present if the measured voltages are stable and the sum of the voltages of
the positive pole against earth potential and the negative pole against earth potential of a
string is approximately equal to the voltage between the positive and negative poles.
Location of the Earth Fault
The approximate location of the earth fault can be calculated from the ratio of the voltages
measured between plus and earth potential and minus and earth potential.
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.
• Restart the inverter (see Section 7
"Commissioning", page 56).
☑ You have not detected any earth fault. It is likely that one of the thermally monitored
varistors is defective.
• Check varistors (see Section 12.3
"Checking the Function of the Varistors",
page 85).