SMA SC 500U Installation - Manual (Page 50)

SMA Solar Technology AG
50 SC500U-IUS093411 Installation Guide
8.5.2 Connecting the PV Modules
1. Open the Sunny Central as described in chapter 10 "Opening the Sunny Central" (page 60).
2. Cover the PV modules.
3. Switch off the fuses in the DC distribution boxes (e.g. Sunny Central String-Monitor) and secure
them against reconnection.
4. Follow all safety precautions of the module manufacturer.
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 (see also Section
8.4 "Requirements for Connecting cables to Rails"
(page 47)).
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.
The illustrations in this chapter show a Sunny Central which is equipped for connection to
9 or 18 DC strings.
DANGER
Voltage is present in PV modules exposed to light.
Death resulting from electric shock.
A
Stop S tart
4
3