SMA 600-US - Manual (Page 44)

9 Troubleshooting SMA America, LLC
44 CU600-1000US-IA-en-10 Installation Manual
9 Troubleshooting
9.1 LED Signals
The LEDs are part of the reverse polarity detection of the Connection Unit 1000-US and signalize if a
string has been connected correctly or with the wrong polarity.
Figure 13: LED signals of the reverse polarity detection for the SMA Connection Unit 1000-US
Item LED Status Explanation
A LED INPUT A glowing red String at INPUT A is connected with the wrong polarity.
B LED middle glowing green String at INPUT A and/or INPUT B is connected
correctly
C LED INPUT B glowing red String at INPUT B is connected with the wrong polarity