SMA SC 500U Installation - Manual (Page 51)

SMA Solar Technology AG
Installation Guide SC500U-IUS093411 51
Negative Grounding
1. Connect the DC– cables to the grounded rails on
the left wall of the interface cabinet (see also
Section 8.4 "Requirements for Connecting cables
to Rails" (page 47)). The rail is marked "DC–".
2. Tighten the 2 screws of each cable lug in clockwise
direction using a torque of 55 ft-lbs (75 Nm).
☑ The DC– cables are now connected.
3. Connect the DC+ cables to the non-grounded rails
on the rear wall of the interface cabinet (see also
Section 8.4 "Requirements for Connecting cables
to Rails" (page 47)). The rail is marked "DC+".
4. Tighten the 2 screws of each cable lug in clockwise
direction using a torque of 55 ft-lbs (75 Nm).
☑ The DC+ cables are now connected.
Positive Grounding
1. Connect the DC+ cables to the grounded rails on
the left wall of the interface cabinet (see also
Section 8.4 "Requirements for Connecting cables
to Rails" (page 47)). The rail is marked "DC+".
2. Tighten the 2 screws of each cable lug in clockwise
direction using a torque of 55 ft-lbs (75 Nm).
☑ The DC+ cables are now connected.
3. Connect the DC– cables to the non-grounded rails
on the rear wall of the interface cabinet (see also
Section 8.4 "Requirements for Connecting cables
to Rails" (page 47)). The rail is marked "DC–".
4. Tighten the 2 screws of each cable lug in clockwise
direction using a torque of 55 ft-lbs (75 Nm).
☑ The DC– cables are now connected.