Troubleshooting; The Red Led Is Continuously On; Check Pv Generator For Ground Fault - SMA SUNNY MINI CENTRAL 6000TL Installation Manual

Troubleshooting

9 Troubleshooting
Should the Sunny Mini Central display other blink codes or display messages than those described
in section 6 „Commissioning" (40), please refer to the operating manual of the Sunny Mini Central
to find the exact meaning of the display message or the blink code and, if necessary, the details on
troubleshooting.
Please do not attempt any other repairs than those described here, but instead use the 24-hour
replacement service (the Sunny Mini Central is made ready for shipping within 24 hours and then
given to a shipping company) and the SMA Solar Technology AG repair service.
9.1 The Red LED is Continuously On
Either a ground fault exists in the PV generator or at least one of the varistors for the overvoltage
protection is defective.
9.1.1 Check PV Generator for Ground Fault
1. Disconnect the Sunny Mini Central from both the DC and AC connections, as described in
section 7.1 „Opening the Sunny Mini Central" (46).
NOTICE!
Excessive voltages can destroy the measuring device!
• Only use measuring devices with a DC input voltage range up to at least 700 V.
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.
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.
• Do not touch PE.
• Wait until no voltage can be measured.
• Do not connect strings with ground faults to the Sunny Mini Central.
54 SMC6-8TL-IEN093231
SMA Solar Technology AG
Installation Guide