Electrical Connection
SMA America, LLC
54
SB50US-80US-eng-IUS112633
Installation Guide
Positive 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).
In order to check whether your inverter is grounded as intended, please observe section
6.5.2 ”DC Input Grounding” (page 49).
1. Connect the negative DC cable to the terminal
labeled PV UNGROUNDED (A) in the SMA DC
Disconnect.
2. Connect the positive DC cable to the terminal
labeled PV GROUNDED (A) in the SMA DC
Disconnect.
4. Using a screwdriver, make a hole in the left sealing
grommet.
5. Remove the rubber membrane.