SMA SC 400HE Installation - Manual (Page 81)

SMA Solar Technology AG External Connections
Installation Guide SCxxxHE-IEN104432 81
9. Connect the DC cables on the cage clamps directly to the low-voltage HRC fuse holders.
10. Tape sealing tape to the front side of the remaining sliding plates.
12. If necessary, seal the free space around the cable inlet using PU foam.
6.6.3 Additional Connections of DC Main Distributors
In the event that the quantity of optional low-voltage HRC fuses in the Sunny Central prove to be
insufficient, the possibility exists to connect additional DC strings to the Sunny Central. To this end, up
to two more DC main distribution boxes (Sunny Main Boxes) can be connected in the DC terminal
area of the Sunny Central.
The following two figures illustrate the connection points for the Sunny Main Boxes. Two bore holes
for M12 have been drilled into the output rails.
NOTICE!
Improper handling can cause faulty terminal connection
• Do not use any grease for the connection of the DC cables to the terminals.
• The cable endings and terminal points must be free of grease and dirt.
Connection to LV / HRC 3 fuses
If LV / HRC 3 fuses are used, no cage clamps are required. The DC cable is then connected
to the low-voltage fuse holders with terminal lugs, see notes in chapter 6.6.1 ”Connecting
the DC Cable to the Busbar” (page 77).
11. Insert the sliding plate into the DC cabinet.
Number of Sunny Main Boxes and their corresponding connection cross-sections
• Two additional external Sunny Main Boxes with a maximum connection cross-section
of 1 x 300 mm² per potential
• An additional external Sunny Main Box with a maximum connection cross-section of
2 x 300 mm² per potential