Electrical Connection
SMA America, LLC
56
SB50US-80US-eng-IUS112633
Installation Guide
6.5.5 DC Connection with Additional DC Distribution
For a parallel connection of more than 1 string in front of the integrated DC Disconnect, use the
COMBINED terminal on the non-grounded side.
Using the Spring Terminal Labeled COMBINED
1. Insert an insulated screwdriver into the slot in the spring terminal provided.
2. Press the screwdriver upward.
☑ The spring clamp terminal is open.
3. Feed the stripped cable into the spring clamp terminal.
4. Pull the screwdriver back into its original position.
5. Remove the screwdriver.
☑ The spring clamp terminal is closed and the cable is fixed.
6. Pull on the cable to check whether it is secure.
DC Connection with Additional DC Distribution, Negative Grounding
3. Tighten all cables in the terminal blocks in the SMA DC Disconnect with a torque of 15 in-
l
b
s
.
(1.7 Nm).
1. Connect the positive DC cable to the terminal (A)
labeled COMBINED in the SMA DC Disconnect.
2. Connect the negative DC cable (B) to the terminal
labeled PV GROUNDED in the SMA DC
Disconnect.