ABB REACT-3.6-TL Product Manual page 94

OUT
IN
21
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:
Shield continuity must be provided along the communication line and must be grounded at a
single point using terminal 19 or 20 ( ).
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When connecting a single inverter to the monitoring system, activate the
communication line termination resistance by setting the switch for RS485
M-B line termination 20 (to the ON position).
Set a different RS485 address on each inverter of the chain. An address
can be chosen freely from out of 1 to 63.
The inverter address is set using the display and the keyboard (see the
specific chapter).
When an RS-485 connection is being used, if one or more inverters
are added to the system at a later time, it is necessary to remember to
reset to OFF the switch on the termination resistance being used by the
inverter which previously was the last in the system.
Each inverter is supplied with one (1) preset RS485 address and with an
RS485 M-B line termination switch
Connect the signals respecting the following positions:
Terminal Terminal
Description
name number
7, 8 -T/R of the RS485 M-B communication line
RS485 9, 10 +T/R of the RS485 M-B communication line
M-B Reference (RTN) of the RS485 M-B
11, 12
communication line
SH
+T/R
-T/R
RTN
SH
+T/R
-T/R
RTN
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5 - Installation
20 in the OFF position.
Signal
Positive data
Negative data
Reference
Shield
Symbol
+T/R
-T/R
RTN
SH ( )