SMA SC 400HE Installation - Manual (Page 42)

Internal Electrical Connections SMA Solar Technology AG
42 SCxxxHE-IEN104432 Installation Guide
Connecting the Power Cables in the Right System
1. Connect L1 at the lower power module in the inverter cabinet.
2. Insert L1 through the cable gland A.
3. Connect L1 at the sinusoidal filter in the AC cabinet according to the label.
4. Tighten the cable gland A.
5. Connect L3 at the middle power module in the inverter cabinet.
6. Insert L3 through the cable gland B.
7. Connect L3 at the sinusoidal filter in the AC cabinet according to the label.
8. Tighten the cable gland B.
9. Connect L2 at the upper power module in the inverter cabinet.
10. Insert L2 through the cable gland C.
11. Connect L2 at the sinusoidal filter in the AC cabinet according to the label.
12. Tighten the cable gland C.
☑ The power cables are connected.
5.2 Connecting the Internal PE Connection
The individual switch cabinets are equipped with PE rails that must be connected together at the time
of installation. A pre-assembled PE cable can be found in the AC cabinet. The PE rails are located at
the bottom of the AC cabinet, behind the sinusoidal filter choke. A PE rail is located in the DC / inverter
cabinet at the bottom of the exterior wall of the DC cabinet, and an additional rail can be found in
the connecting point between the DC and inverter switch cabinet units.
1. Feed the cable behind the sinusoidal filter choke in the AC cabinet and the power units in the
inverter cabinet into the DC cabinet.
2. Connect the cable to the PE rail in the DC cabinet.
Laying cables
The power cables must be bundled in the inverter cabinet by using cable ties. This prevents
the cables from being damaged by pointed or sharp metal edges.