SMA SI 3.0-11 Installation - Manual (Page 37)

SMA Solar Technology AG 7 Electrical Connection
Installation Manual SI30M-44M-60H-80H-IA-en-30 37
7.4.7.8 Connecting the Cable of the Multicluster Communication
In a multicluster system, the masters of the various clusters communicate with each other (see Multicluster Box
documentation). An SI-SYSCAN.BGx communication interface must be installed in each master for Multicluster
communication. This communication is not necessary for a multicluster system with one cluster. If the Sunny Island was
ordered with the "Communication for multicluster system" order option, SI-SYSCAN.BGx is installed in each master.
Figure 11: Design of the SI-SYSCAN.BGx
Cable requirements:
☐ Classification: CAT5e
☐ Maximum cable length: 30 m
Procedure:
1. If no SI-SYSCAN.BGx communication interface is installed, install SI-SYSCAN.BGx in each master
(see SI-SYSCAN-NR documentation).
2. Remove the terminator from the SysCanOut pin connector on the master of the main cluster and plug it into the
SysCanIn pin connector.
3. Plug the yellow data cable into the SysCanOut pin connector on the main cluster master (see Section 7.5.4
"Connecting the Data Cable", page 54).
4. Plug the other end of the yellow data cable into the SysCanIn pin connector on the master of the extension cluster 1.
5. Connect the other extension clusters with each other as described in steps 3 and 4. Remove the terminators for this.
6. Leave the terminator plugged into the unused SysCanOut pin connector. This closes the communication bus.
7.4.7.9 Connecting RS485
The SI-COMSMA.BGx communication interface is required for communication with a communication device
(e.g. Sunny WebBox) or other SMA products (e.g. PV inverter). If the Sunny Island was ordered with the
"Communication for RS485" order option, the SI-COMSMA.BGx is installed on each master.
Position Designation
A Mounting hole
B Type label
C SysCanIn pin connector
D SysCanOut pin connector