Rs-485 Network Layout; Installing The Rs-485 Cable - Advanced Energy AE 3TL 600 Series Installation And Operation Manual

RS-485 NETWORK LAYOUT

When multiple inverters or other Modbus slave devices are connected to a single
Modbus master device, the multiple devices need to be connected in a daisy chain
layout.
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Important
When multiple devices are wired to the network, the network shield must be
terminated to earth ground at one point on the network, typically at the
beginning or the end. For device connections, the shield must be rewired to
provide a continuous shield and isolated from ground.

Installing the RS-485 Cable

RS-485 WIRING REQUIREMENTS
The Modbus RTU connections are made using shielded, insulated, 18-24 gauge
twisted-pair communication cable that has a characteristic impedance of 120 Ω. If the
RS-485 network will not pass through any high voltage (> 300 V) areas, then 300 V
rated cable may be used in the low voltage data monitoring compartment of the
inverter. Check with your local inspector or project engineer if you need assistance in
determining this requirement.
Some appropriate 300 V data cables include:
• Belden 3105A (1P22 AWG shielded)
• Belden 3082A (1P15 AWG + 1P18 AWG shielded)
Belden 7897A (1P15 AWG + 1P18 AWG shielded) is an example of a 600 V rated
cable that may also be used; others exist as well.
TO CONNECT RS-485
Pin 1 Unassigned
Pin 2 RS-485 +
Pin 3 RS-485 -
Pin 4 Shield / Reference
Bus termination (wire jumper) between pins 1 and 2 and pins 3 and 4
1. Insert the communication and control wires from below with conduits or
connector(s). The communication wires shall be installed in the cable ducts
provided.
Ethernet, RS-485 (IN and OUT), and Analog (Sensor) terminals are provided.
570-1003552-05A
RS-485 OUT
Data Monitoring and Controls
Advanced Energy® AE 3TL Inverters
RS-485 IN
Pin 1 Unassigned
Pin 2 RS-485 +
Pin 3 RS-485 -
Pin 4 Shield / Reference
7‑3