SMA SC 500HE-US Installation - Manual (Page 63)

SMA America, LLC 8 Electrical Connection
Installation Manual SC500HEUS-IA-US_en-14 63
Connection to busbars
1. Open the Sunny Central as described in section 10.1.
2. Position the cable lug or lugs on the busbar.
3. Insert the lock washers and screws into the holes.
4. Tighten the screw with a nut in a clockwise direction using a torque of 55 ft.-lbs.
5. Connect all grounding cables as described above.
6. The DC– cables are connected.
8.6.2 PV Modules: DC+ Connection at Negative Grounding and
DC − Connection at Positive Grounding
Connection with Terminal Blocks
The illustration below shows a Sunny Central which is equipped for connection to 9 or 18 DC strings.
1. Strip the cable by about 1.2 in. (30 mm).
2. Open the screw terminal completely.
A Busbars for the connection of the PV modules'
grounded DC path cables.
A Screw terminals for the connection of the PV modules'
ungrounded DC path cables.
Position: Interface Cabinet, right wall, middle.
1.2 in.