ABB PVI-3.0-TL-OUTD-S-US, Product Manual

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3007CC3
3 - Mounting and wiring
S
erial communication (RS-485)
The inverter the communication line cabling can be connected using the RJ45 connectors or
using the terminal block. If the terminal blocks are used, the signal RTN, +T/R and –T/R have
to be cabled. If the RJ45 plugs are used, the pin-out is reported below.
Pin # Signal Description Notes
1,2,6,8 N/U Not Used -
3 +TR + Data Line 1
4 +R DO NOT CONNECT 2
5 -TR - Data Line 1
7 RTN Signal Return 1
1. Required for RS485 communication.
2. Required for Remote OFF control; DO NOT CONNECT pin #4 when cabling units with
AFD installed.
Use a cable designed for use with RS-485 communications such as Belden 3106A, which
is a data cable wire with one twisted pair for the +/-T/R signals, one ground conductor, and
a shield with drain wire (equivalent). The table below shows connections for a dual twisted
pair shielded cable.
Signal Symbol Pair Cable
Positive data +T/R A 1
Negative data -T/R A 2
Reference RTN B 1+2
Continuity of the shield in the RS-485 cable is important for low noise on the line; this is
particularly so for large plants with multiple inverters. For best results the shield must be tied
to ground at only one point on the line, typically at one end or the other.The shield wiring must
be continuous as it passes from one inverter to the next on a daisy chain, but must not be tied
to ground at these junctions.
D
aisy chain multi unit configuration
The RS-485 terminal block connectors or RJ45 connectors can be used to connect a single
inverter or implement a multi-unit wiring configuration called daisy chain.
• The terminal block has two rows of contacts.
• The upper and lower rows are internally paralleled to allow daisy chain connections.
• The two RJ45 connectors available for the RS-485 communication are equivalent to
each other and can be used interchangeably for the input or output of the line when
creating a daisy chain connection of the inverters.
WARNING! If a daisy chain connection is required for AFD installed inverters use
standard multiconductor RS-485 cable and connect the three RS-485 leads (-RTN,
+T/R, -T/R) using only the mating connector supplied with the inverter.
Do not connect pin 4 of RJ45 connector with any AFD installed inverters!