SMA SSM8-21-BS - Manual (Page 32)

6 Electrical Connection SMA Solar Technology AG
32 SSMxx-21-IA-BS-JP-en-20 Installation Manual
The data cables are connected to the lowest String-Monitor Unit measurement PCB via a connector.
Procedure:
To connect the data cables in the Sunny String-Monitor, carry out the following steps in the given sequence. The exact
procedure is described in the following sections.
• Preparing the data cables
• Connecting the data cables to the connectors
• Connecting the connector to the String-Monitor Unit
Preparing the Data Cables
Requirement:
☐ The data cables must be routed into the Sunny String-Monitor through the cable glands (see Section 6.2 "Inserting
the Cables into the Switch Cabinet", page 23)
Additionally required material (not included in the scope of delivery):
☐ 1 bootlace ferrule for conductor cross-section 6 mm
2
Procedure:
1. Dismantle the data cables by 100 mm.
2. Unravel the cable shield of the data cables.
3. Push the unraveled cable shield to one side of each data cable and twist.
4. If you are connecting two data cables, twist the cable shields of the data cables together.
5. Shorten the twisted cable shield to 20 mm.
6. Mount the bootlace ferrule on the twisted cable shield and crimp.
Connecting the Data Cables to the Connectors
Additionally required material (not included in the scope of delivery):
☐ 3 cable ties (dimensions: 100 mm x 2.5 mm)
Procedure:
1. Strip off the insulated conductors of the data cables by 10 mm.
2. Remove the connector of the lowest String-Monitor Unit.
3. Connect the insulated conductors of the data cables to the female connector in accordance with the circuit diagram:
• Hold the actuation lever down.
• Insert the insulated conductor:
Limited number of String-Monitor Units per Ethernet hub
Since the String-Monitor Unit measurement PCBs are supplied with voltage via the data cables, the number of
connected String-Monitor Units is limited.
• Do not connect more than ten String-Monitor Units per Ethernet hub.
The various types of Sunny String-Monitors are equipped with differing numbers of String-Monitor Units:
• Sunny String-Monitor SSM8-21: 1 String-Monitor Unit
• Sunny String-Monitor SSM16-21: 2 String-Monitor Units
Terminal Signal Color of insulated conductor*
Pin 1 GND_EXT Conductor pair: white/brown
Pin 2 RS485L green