Checking The Pv Array For Ground Faults - SMA SUNNY MINI CENTRAL 4600A Installation Manual

SMA Solar Technology AG
9.3.1 Checking the PV Array for Ground Faults
1. Disconnect the inverter from both the DC and AC sides as described in section 7.2 "Opening
the Inverter" (page 55).
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.
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.
☑ A ground fault exists if the measured voltages are stable and the sum of the voltages from
the positive pole to the ground potential and from the negative pole to the ground potential
of a string is approximately equal to the voltage between the positive and negative poles.
Installation Manual SMC46-60A-IA-IEN120471
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