SMA SB 3000TL-20 Installation - Manual (Page 79)

SMA Solar Technology AG Troubleshooting
Installation Guide SB30TL_40TL_50TL-IA-IEN120231 79
11 Troubleshooting
11.1 Checking the PV Generator for a Ground Fault
If the inverter displays event number "35", "36" or "37", there is probably a ground fault in the PV
generator.
Check the strings for ground faults as described in the following:
1. Open the inverter as described in section 7.2 ”Opening the Inverter” (page 61).
2. Measure the voltages between the plus pole of the
strings and the ground potential (PE).
3. Measure the voltages between the minus pole of
the strings and the ground potential (PE).
4. Measure the voltages between the plus pole and
the minus pole of each string.
☑ If the voltages measured are stable and the total of the voltages from the plus pole against
ground potential and the minus pole against ground potential of a string roughly
corresponds to the voltage between the plus pole and minus pole, then there is a ground
fault.
Notice!
Excessive voltages can destroy the measuring device!
• Only use measuring devices with a DC input voltage range up to at least 1,000 V.