PV Powered 3000 Installation Manual download pdf (Page 58)

Troubleshooting SMA Solar Technology AG

58 SB25_30-IA-IEN115050 Installation Manual

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38).

☑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59).

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PV Powered 3000 Installation Manual Page 58