SMA SMC 7000HV Installation - Manual (Page 74)

Troubleshooting SMA Solar Technology AG
74 SMC70HV11-IA-IEN112970 Installation Manual
9.3.1 Checking the PV Array for Ground Faults
1. Disconnect the inverter from both the DC and AC connections as described in section
7.2 "Opening the Inverter" (page 56).
2. Measure the voltages between the plus pole of
each string and the ground potential (PE).
3. Measure the voltages between the minus 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.
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.