SMA SB 2500 Installation - Manual (Page 57)

SMA Solar Technology AG Troubleshooting
Installation Manual SB25-30-IA-en-51 57
Location of the Earth Fault
The approximate position of the earth fault can be determined from the ratio of the measured
voltages between the plus pole against earth potential and the minus 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 finished.
Result Measure
☑ You have found 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.
• Commission the inverter as described in
Section 6.1 "Commissioning the Inverter"
(page 37).
☑ You have found no 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 58).