SMA 10000TL - The Red LED Glows Continuously (Ground Fault)

Troubleshooting SMA Solar Technology AG
74 SMC9-11TLRP-IEN100640 Installation Guide
9.3 The Red LED Glows Continuously (Ground Fault)
The inverter has detected a ground fault in the PV generator.
Proceed as follows to find it:
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 and minus
pole of a string against the ground potential.
☑ If voltage is found, 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 plus against ground potential and minus against ground potential.
Example:
The ground fault is between the second and third module in this case.
NOTICE!
Excessive voltages can destroy the measuring device!
• Only use measuring devices with a DC input voltage range up to at least 1000 V.
DANGER!
Risk of lethal electric shock!
In case of a ground fault, the PV generator may carry high voltages.
• Do not touch the frame of the PV generator.
• Wait until no voltage can be measured.
• Do not connect strings with ground faults to the inverter.