SMA SB 3000TL-20 Installation - Manual (Page 80)

Troubleshooting SMA Solar Technology AG
80 SB30TL_40TL_50TL-IA-IEN120231 Installation Guide
Location of the ground fault
The approximate position of the ground fault can be determined from the ratio of the measured
voltages between the plus pole against ground potential (PE) and the minus pole against
ground potential (PE).
Example:
In this case, the ground fault is between the second and third PV module.
☑ The ground fault check is finished.
Result Measure
☑ You have found a ground fault. • The installer of the PV generator must remedy
the ground fault in the affected string before
you may reconnect the string to the inverter.
The illustration below shows the location of
the ground fault.
• Do not reconnect the faulty string.
• Re-commission the inverter as described in
section 6.1 ”Commissioning the Inverter”
(page 53).
☑ You have not found a 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 81).