SMA AUTOMATIC SWITCH BOX L - Manual (Page 36)

Electrical Connection SMA Solar Technology AG
36 AS-BoxL-IEN084410 Installation Guide
5.9 Communication
The Automatic Switch Box transfers voltage measurement signals and current measurement signals to
Sunny Backups. These signals are transferred via the control cables and sensor cables (red). The
Automatic Switch Box is controlled by the Sunny Backup via a CAN bus with the communication cable
(black).
Before you can connect the control, sensor and communication cables in the Automatic Switch Box,
you have to guide the cables into the Automatic Switch Box through the two-part cable openings. To
do this, proceed as in chapter 5.9.1 "Guiding cables into the Automatic Switch Box" (page 36). Then
connect the cables as described in chapter 5.9.2 "Connecting the control and sensor cables"
(page 38) and chapter 5.9.3 "Connecting the communication cable" (page 39).
5.9.1 Guiding cables into the Automatic Switch Box
1. Loosen the screws of the fastening plate of the two-part cable opening inside the Automatic
Switch Box.
2. Remove the fastening plate and place it to the side.
3. Remove cable opening from the housing.
4. Loosen screws of the two-part cable opening.
5. Remove the half without the T-shaped fastening pieces.
6. Lay a communication cable as well as a control and sensor cable with sufficient length from the
opening to the desired connection through the part of the cable opening with the T-shaped
fastening pieces. Fix them in place with cable ties.
7. Bolt the halves back together. Fasten the screws finger-tight.
The cables and the placeholder (plastic rod) have to be fitted tightly between both sides of the
two-part cable opening. Otherwise, a proper seal of the enclosure cannot be guaranteed.
8. Insert cable opening including cable into the housing from the outside.
9. Attach fastening plate of the two-part cable opening and fasten the screws finger-tight.
10. Repeat steps 1 - 9 for the remaining control and sensor cables. A two-part cable opening is
available for this.
☑ Cables are guided into the Automatic Switch Box.