PV Powered 3000 Manual de instalación descargar pdf (Pagina 57)

SMA Solar Technology AG Troubleshooting

Installation Manual SB25_30-IA-IEN115050 57

9.3.1 Checking the PV Array for Earth Faults

1. Disconnect the inverter from both the DC and AC sides as described in Section 7.2 "Opening

the Inverter" (page45).

2. Measure the voltages between the positive pole of

each string and the earth potential (PE).

3. Measure the voltages between the negative pole of

each string and the earth potential (PE).

4. Measure the voltages between the positive and

negative poles of each string.

☑ An earth fault exists if the measured voltages are stable and the sum of the voltages from the

positive pole to the earth potential and from the negative pole to the earth potential of a

string is approximately equal to the voltage between the positive and negative poles.

DANGER!

Risk of lethal electric shock

• Only touch the cables of the PV array on 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.

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PV Powered 3000 Manual de instalación Pagina 57