SMA Sunny Boy 3000TL-US Installation Manual page 42

6 Electrical Connection
12. Insert the equipment grounding conductor of the
PV array into the grounding terminal in the DC
Disconnect and tighten the terminals using a
flat-blade screwdriver (blade width: 5 mm)
(torque: 15 in-lb (1.7 Nm)).
13. Check the PV array for ground faults (see Section 11.4 "Checking the PV System for Ground
Faults", page 71).
14. Connect the first string for input A to the terminal
blocks for input A. Use a flat-blade screwdriver
(blade width: 5 mm) for this (torque: 15 in-lb.
(1.7 Nm)).
• Insert the cable DC+ into the screw terminal +
and tighten the terminal. Ensure the correct
polarity when doing so.
• Insert the cable DC − into the screw terminal −
and tighten the terminal. Ensure the correct
polarity when doing so.
15. If there is another string for input A, connect it in the same way to the terminal blocks for input A.
16. Connect the first string for input B to the terminal
blocks for input B. Use a flat-blade screwdriver
(blade width: 5 mm) for this (torque: 15 in-lb.
(1.7 Nm)).
• Insert the cable DC+ into the screw terminal +
and tighten the terminal. Ensure the correct
polarity when doing so.
• Insert the cable DC − into the screw terminal −
and tighten the terminal. Ensure the correct
polarity when doing so.
17. If there is another string for input B, connect it in the same way to the terminal blocks for input B.
18. Ensure that all screw terminals are correctly connected and that the cables are securely
positioned in the screw terminals
19. Turn the rotary switch of the DC Disconnect to the Off position.
42 SB3-5TLUS22-IA-en-12
SMA America, LLC
Installation Manual