SMA SC 500U Installation - Manual (Page 53)

SMA Solar Technology AG
Installation Guide SC500U-IUS093411 53
8.6.2 Connecting AC
1. Pay close attention to all safety precaution measures regarding the low voltage grid.
2. Switch off the AC disconnect and secure it against accidental switching on.
3. Ensure that no voltage is present.
4. Open the Sunny Central as described in Section 10 "Opening the Sunny Central" (page 60).
5. Lead the cables into the Sunny Central as described in Section 6 "Attaching the Conduits"
(page 35).
6. Connect ground cables to the terminal blocks at the
bottom right of the Sunny Central.
7. Open the screw terminal completely.
8. Plug the copper inner conductor of the cable into the
screw terminal.
9. Tighten the screw terminal using an Allen key. The
required torque is 42 ft-lbs (57 Nm).
10. Connect all grounding cables of the modules as
described above.
DANGER
High voltages are present in the live components of the low voltage grid.
Death resulting from burning and electric shock.
11. Open the AC terminals completely.
12. Connect phase A to the terminal marked "A". Tighten
the screw terminal using an Allen key. The required
torque is 42 ft-lbs (57 Nm).
A
Stop S tart
4
3