6 Electrical Connection
SMA Solar Technology AG
Operating manual
NA-BOX-12-3-20-BE-en-12
20
2. Connect the grounding conductor to the spring-cage terminal
PE
at terminal
X201:5
(see Section 9.3,
page 26).
3. Connect the neutral conductor to the spring-cage terminal
N
at terminal
X201:4
.
4. Connect the line conductors to the spring-cage terminals
L1
,
L2,
and
L3
at the terminals
X201:1-3
.
5. Ensure that a right-hand rotating magnetic field is present at the connection point of the Multicluster-Box.
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 provided.
6.4
Connecting Control and Measuring Cables of the Multicluster-Box
Assignment of spring-cage terminals with the control cables:
1 2
5
4
6
3
3 4
7
6
5
1 2
8 9 10 11 12 13
PE
X210
X210
PE
PE
PE
PE
A
B C
D
E
F
Figure 9: Overview of the spring-cage terminals
Position
Designation
A
Multicluster-Box grounding contactor interlock (DC)
B
NA-Box AC contactor feedback (DC)
C
NA-Box voltage measurement (AC)
D
Multicluster-Box generator contactor interlock (AC)
E
NA-Box AC contactor 2 interlock (AC)
F
NA-Box AC contactor 1 interlock (AC)
Cable requirements:
☐ Conductor material: copper
☐ Conductor cross-section: 0.75 mm² to 2.5 mm²
☐ The AC conductors and DC conductors must always be routed in separate cables.
Ground connection at terminals X210 and X211
If the control cable between the Multicluster-Box and NA-Box contains a grounding conductor, the grounding
conductor terminal must not be connected on both sides.
Procedure:
1. Insert the control cables into the product (see Section 9.2, page 25).
2. Connect the control cables to the spring-cage terminals (see Section 9.4, page 27).
