6 Electrical Connection
SMA America, LLC
46
SB3-5TLUS22-IA-en-10
Installation Manual
11. Check the PV array for ground faults (see Section 9.5 "Checking the PV Plant for a Ground
Fault", page 76).
12. Connect the first string to the terminal blocks for
input
A
:
• Connect the DC+ cable to the screw terminal
+
(torque: 15 in-lb (1.7 Nm)). Ensure the correct
polarity when doing so.
• Connect the DC- cable to the screw terminal
‒
(torque: 15 in-lb (1.7 Nm)). Ensure the correct
polarity when doing so.
13. If there is another string with an identical rating, connect it in the same way to the terminal blocks
for input
A
.
14. Connect a different string to the terminal blocks for
input
B
.
• Connect the DC+ cable to the screw terminal
+
(torque: 15 in-lb (1.7 Nm)). Ensure the correct
polarity when doing so.
• Connect the DC- cable to the screw terminal
‒
(torque: 15 in-lb (1.7 Nm)). Ensure the correct
polarity when doing so.
15. If there is another string with an identical rating, connect it in the same way to the terminal blocks
for input
B
.
16. Ensure that all screw terminals are correctly connected and that the cables are securely
positioned in the screw terminals
17. Push the DC Disconnect lid diagonally under the
upper edge of the enclosure and press the lid
down. The lid must be flush with the enclosure
edge.
Closing the DC Disconnect
