SMA SB 2000HF-30 Installation - Manual (Page 73)

SMA Solar Technology AG Troubleshooting
Installation Manual SB20HF-30HF-IA-en-32 73
☑ A ground fault exists if the measured voltages are stable and the sum of the voltages from
the positive pole to the ground potential and from the negative pole to the ground potential
of a string is approximately equal to the voltage between the positive and negative poles.
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 second and third PV modules.
☑ The ground fault check is finished.
Result Measure
☑ You have found a ground fault. • 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.
• Recommission the inverter as described in
section 7 "Commissioning" (page 49).
☑ You have found no ground fault. It is likely that one of the thermally monitored
varistors is defective.
• Check the function of the varistors as
described in section 11.2 "Checking the
Function of the Varistors" (page 74).