SMA SMC 4600A Installation - Manual (Page 64)

Troubleshooting SMA Solar Technology AG
64 SMC46-60A11-IA-en-81 Installation Manual
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 48).
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 is present if the measured voltages are stable and the sum of the voltages of
the positive pole against earth potential and the negative pole against earth potential of a
string is approximately equal to the voltage between the positive and negative poles.
DANGER!
Danger to life due to electric shock
• Only touch the insulation of the PV array cables.
• Do not connect strings with earth faults to the inverter.
NOTICE!
Excessive voltages can destroy the multimeter
• Only use multimeters with a DC input voltage range of up to at least 1,000 V.