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15. Connection of the communication and control signals (continuation)
+5V output connection
On the communication and control signal terminal block
The maximum absorption permitted from this auxiliary power supply voltage is 100 mA.
Connection of RS485 LOGGER serial communication line
The RS485 LOGGER serial communication line on the communication and control signal terminal block
monitoring devices that communicate with the Modbus communication protocol. On the communication and control signal terminal block
connection points for each serial line signal (+T/R, -T/R and RTN) so as to be able to make a daisy-chain connection ("in-out") of multiple inverters.
Connection of a monitoring system to the RS485 LOGGER communication line consists of first connecting all the units in the chain in the "daisy-chain" ("in-
out") configuration, respecting corresponding signals, and then activating the communication line termination resistance in the last element in the chain by
setting the RS485-LOGGER line termination switch
For long distance connections, it is preferable to use a shielded twisted pair cable with characteristic impedance of Z0=120 Ohm
like the one shown in the following table:
Signal
Positive data
Negative data
Reference
Shield
Configurable Relay connection (OUTPUT 1 and OUTPUT 2)
The inverter is equipped with 2 multifunction relays with configurable activation. It can be connected with normally open contact (being connected between
the NO terminal and the common contact C) and with normally closed contact (being connected between the NC terminal and the common contact C).
This multifunction relays can be used in different operating configurations that can be selected by accessing the web server user interface
Different types of devices (light, sound, etc.) can be connected to the relay, provided they comply with the following requirements:
- Alternating current
Maximum Voltage: 240 Vac / Maximum Current: 1 A
- Direct current
Maximum Voltage: 30 Vdc / Maximum Current: 0.8 A
- Cable requirements
Conductor cross-section: from 0.14 to 1.5 mm
The ALARM contact can be used only with systems that ensure a safety isolating additional at least (supplementary insulation in
relation to the DC input voltage)
Ethernet connection
The ethernet connection allows a direct data transfer to the ABB server for monitoring purpose.
When the inverter will be powered on, network parameters are automatically set and the inverter starts
transmissing telemetry data to the Aurora Vision® CLOUD platform.
The connection of the ethernet communication cable must be made on the specific connectors
on the communication and control board inside the REACT2-UNO
connected in daisy chain or ring configuration use both connectors.
The cable should be compliant to the following specification:
- Cable type: Patch or Cross type, 100BaseTx, CAT5e (or higher) with shielding STP or FTP.
- UV-resistant if used outdoors
- Type of plug: metallic shielded RJ45
- The maximum length that can reach these cables is 100 meters, and it is always advisable
not to let them pass by the power cords to avoid interference with data transmission.
- Maximum inverters number connected over one single daisy chain is 40
In order to avoid ground loop (that could create communication issues) the shield of any Ethernet cable must be connected to the
RJ45 plug in only one side, the other side of the shield should be leaved floating. This could be guaranteed by crimping the shield
or the screen of the ethernet cable to the RJ45 connectors only at one end of each cables.
Three topologies of ethernet connection to the router are available:
Ring configuration
The ring configuration is the preferrable way to connect the units in order to allow reaching inverters in case of single inverter fault.
In case inverters are connected to the networking switch with a ring topology is recommended to enable SPT protocol on the switch
On each configuration of connection the maximum length of the cable must be 100m maximum between inverter – inverter and inverter – switch.
Please refer to Aurora Vision documents available on ABB website for further information how to get an Aurora Vision account for remotely monitoring and
managing the installed solar assets.
there is auxiliary voltage of +5V.
21
(to the ON position).
37
Symbol
+T/R
-T/R
RTN
2
ROUTER
+T/R
-T/R
RTN
+T/R
-T/R
RTN
30
located
02
. If the inverters of the plant need to be
Daisy chain configuration
ROUTER
- 18 -
40
is reserved for the connection of the inverter to
30
Star configuration
ROUTER
EN
40
there are two
METER-485
CARD
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