SMA SI 3.0-11 Installation - Manual (Page 36)

7 Electrical Connection SMA Solar Technology AG
36 SI30M-44M-60H-80H-IA-en-30 Installation Manual
7.4.7.6 Connecting the Data Cable of the Multicluster Box
For a multicluster system, the Multicluster Box communicates with the master of the main cluster via a black
data cable (see Multicluster Box documentation). The black data cable is part of the scope of delivery of the
Multicluster Box.
Requirements:
☐ The total length of the communication bus must not exceed 30 m. Keep in mind that the communication bus connects
several nodes such as additional Sunny Island inverters.
Cable requirements:
☐ Classification: CAT5e
☐ Type of plug: RJ45
Procedure:
1. Plug the data cable into a free ComSync pin connector on a
Sunny Island of the main cluster. Ensure that the cable is correctly
connected (see Section 7.5.4 "Connecting the Data Cable",
page 54).
2. Connect the other end of the data cable to the Multicluster Box (see Multicluster Box documentation).
3. Ensure that the communication bus is closed at each end, e.g. with a terminator.
7.4.7.7 Connecting Control and Measuring Cables of the Multicluster Box
For a multicluster system, the Multicluster Box communicates control and measuring data with the three
Sunny Island inverters of the main cluster via three red data cables (see Multicluster Box documentation).
The red data cables are part of the scope of delivery of the Multicluster Box.
Procedure:
• Plug the red data cables into the pin connector BackupVtgCur on
the Sunny Island units of the main cluster (see Section 7.5.4
"Connecting the Data Cable", page 54). Observe the following
assignment:
• Connect the master with the Mstr./L1 connection of the
Multicluster Box.
• Connect slave 1 with the Slv1./L2 connection of the Multicluster
Box.
• Connect slave 2 with the Slv2./L3 connection of the Multicluster
Box.