SMA STP 15000TL Installation - Manual (Page 75)

SMA Solar Technology AG Troubleshooting
Installation Manual STP20TLHE-IA-IEN122222 75
11 Troubleshooting
11.1 Checking the PV Array for Earth Faults
If the inverter displays event numbers "3501", "3601" or "3701", there is a high probability of an
earth fault in the PV array.
Check the strings for earth faults as described below:
1. Disconnect the inverter as described in Section 8 "Disconnecting the Inverter from Voltage
Sources" (page 58).
2. Measure the voltages between the plus pole of
each string and the earth potential (PE).
3. Measure the voltages between the minus pole of
each string and the earth potential (PE).
4. Measure the voltages between the plus and minus
poles of each string.
DANGER!
Danger to life due to live PV array.
• Only touch the cables of the PV array by their insulation.
• Do not connect strings with earth faults to the inverter.
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.