SMA Wireless-Set485-01 - Manual (Page 16)

Electrical Connection SMA Solar Technology AG
16 WirelessSet485-IEN091511 Installation Guide
5 Electrical Connection
First connect all the devices on the inverter side and then those on the communication device side. For
each side, you need to carry out the following instructions in sequence.
5.1 Cabling Recommendations for the RS485
The cable length and quality affect the signal quality.
Note the following cabling recommendations in order to achieve good signal quality.
Indoors
For the indoors, use a cable with the following key properties.
• Cross-section: minimum 2 x 2 x 0.22 mm
2
, and minimum 2 x 2 x AWG 24
• Shielded
• Twisted pair cables
• The maximum cable length in each RS485 bus is 1,200 m.
We recommend the following cable types for indoors:
• SMA communication cable: COMCAB-INxxx*
* available in lengths of xxx=100 m/200 m/500 m and 1000 m.
Outdoors
For the outdoors, use a communication cable with the following key properties.
• Cross-section: minimum 2 x 2 x 0.22 mm
2
, and minimum 2 x 2 x AWG 24
• Shielded
• Twisted pair cables
• UV-resistant
• The maximum cable length in each RS485 bus is 1,200 m.
Inverter Side Communication Device Side
1. Connect the antenna cable to the radio
module.
2. Cabling the inverters.
3. Connect the RS485 Power Injector
("inverter").
– Connect the inverter to the RS485
Power Injector.
– Connect the radio module to the RS485
Power Injector.
– Affix the shield clamp.
1. Connect the antenna cable to the radio
module.
2. Connect the RS485 Power Injector
("Datalogger")
– Connect the communication device to
the RS485 Power Injector (see Sunny
Boy Control chapter5.4.2 or Sunny
WebBox chapter 5.4.3 ).
– Connect the radio module to the RS485
Power Injector.
– Affix the shield clamp.