SMA SUNNY BOY 2000HF - 11 Troubleshooting; Checking the PV Array for Ground Faults

Troubleshooting SMA Solar Technology AG
72 SB20HF-30HF-IA-IEN120431 Installation Manual
11 Troubleshooting
11.1 Checking the PV Array for Ground Faults
If the inverter displays event number "35" and the red LED glows at the same time, then there is
probably a ground fault in the PV array.
Check the strings for ground faults as described below:
1. Disconnect the inverter from the AC and DC side as described in section 8"Disconnecting the
Inverter from Voltage Sources" (page58).
2. Measure the voltages between the positive pole of
each string and the ground potential (PE).
3. Measure the voltages between the negative pole of
each string and the ground potential (PE).
4. Measure the voltages between the positive and
negative poles of each string.
DANGER!
Risk of lethal electric shock.
• Only touch the cables of the PV array on their insulation.
• Do not connect strings with ground 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.