Failure Search; Checking The Pv Generator For A Ground Fault - SMA SUNNY BOY 2000HF Installation Manual

Failure Search

11 Failure Search
11.1 Checking the PV Generator for a Ground Fault
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 generator.
Check the strings for ground faults, as described in the following:
1. Disconnect the inverter on the AC and DC sides as described in section 8.2 "Disconnect the
Inverter from Voltage Sources" (page 60).
DANGER!
Risk of lethal electric shock.
• Only touch the cables of the PV generator 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.
2. Measure the voltages between the positive 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.
74 SB20_25_30HF-IEN102911
SMA Solar Technology AG
Installation Guide