Sma SB 6000TL‑US Installation User Manual download pdf (Page 54)

7 Displays and Messages SMA America, LLC

54 SB6-11TL-US-IA-en-13 Installation Manual

If the red LED is permanently lit, there is a ground fault in the PV array.

1. Disconnect the Sunny Boy from the DC and AC sides as described in Section 8.1"Opening the

Sunny Boy",page55.

2. Measure the voltages between the plus and minus pole of a string against the ground potential.

✖ If a voltage has been measured, there is a ground fault in the corresponding string.

• The approximate position of the ground fault can be determined from the ratio of the

measured voltages between the plus pole against ground potential and the minus pole

against ground potential.

Example:

The ground fault is between the second and third module in this case.

4. Repeat step 2 on each string.

5. Resolve the ground fault in the affected string.

6. Restart the Sunny Boy as described in Section 8.2"Closing the Sunny Boy",page56.

Damage to the measuring device through overvoltage

• Only use a measuring device with a DC input voltage range of at least 600 V.

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Sma SB 6000TL‑US Installation User Manual Page 54