SMA SB 6000TL‑US Installation - Manual (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.
3.
Damage to the measuring device through overvoltage
• Only use a measuring device with a DC input voltage range of at least 600 V.