SMA Solar Technology AG GRID-CONNECT-BOX 12, Operating Manual, Page: 19 / 40

SMA Solar Technology AG 6 Electrical Connection
Operating Manual GRID-BOX-12-3-20-BE-en-11 19
6.4 Connecting the Utility Grid
Cable requirements:
Conductor material: copper
The conductor cross-section must be selected according to the rated input power of the utility grid.
Conductor cross-section: 50 mm² to 150 mm²
The power cables must be ground-fault- and short-circuit protected.
The line conductors, neutral conductor and grounding conductor must have the same cross-section.
The AC conductors and DC conductors must always be routed in separate cables.
Procedure:
1. Insert the Multicluster-Box power cables into the Grid-Connect-Box (see Section 9.3, page 25).
2. Connect the grounding conductor to the spring-cage terminal
PE at terminal X301:4 (see Section 9.4.1, page 26).
3. Connect the neutral conductor to the spring-cage terminal N at terminal X301:5 .
4. Connect the line conductors to the spring-cage terminals L1 , L2 and L3 at the terminals X301:1-3 .
5. Ensure that a right-hand rotating magnetic field is present at the grid-connection point.
6. Provide for strain relief of the power cables in the spring-cage terminal by attaching them to the appropriate cable
support rail. Use the strain reliefs and counter-sleeves included in the scope of delivery for this.
6.5 Connecting the Control Cables
Assignment of spring-cage terminals with the control cables:
Figure 10: Overview of spring-cage terminals in the Grid-Connect-Box
Position Explanation
A Multicluster-Box grounding contactor interlock (DC)
B Grid-Connect-Box grid contactor feedback (DC)
C Grid-Connect-Box voltage measurement (AC)
D Multicluster-Box generator contactor interlock (AC)
E Grid-Connect-Box AC contactor interlock (AC)