Automationdirect.com Stellar SR44, User Manual

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7–2
1st Ed, Rev B 07/31/2019
SR44 Series Soft Starter User Manual
7.1 – SR44-RS485 Communication Card
7.1.1 – Communication Card General Information
An optional RS-485 communication adapter card is available for use with SR44 Soft Starters.
• Communication Adapter Part Number: SR44-RS485
• Allows control to be switched between an integral Keypad or alternately through an external
isolated network based on the Modbus standard
• Provides the ability to set up, control, and monitor single or multiple SR44 Soft Starters
• Provides an RS-485 interface with 50V isolation for demanding industrial applications
• Suitable for connection to a Remote Keypad or RS-485 serial network at 9600 baud 8, N, 1
• Allows maximum network lengths: 25 meters [82 ft] for RJ45 connections;
1200m [3937 ft] for RS-485 screw-terminal connections
• Allows connection via RJ45 connectors, or through screw terminals (2-wire)
SR44 Main PCB (not to scale)
J7 Connector
J1–J5
B A G
LEDs
4-pin
socket
2-pin
socket
26-pin connector
primary
RJ45
socket
2ndary
RJ45
socket
SR44-RS485
communication
options selection
links (jumpers)
connections for
Remote Keypad &
addtn’l soft starters
alternate
RS-485 2-wire
connection for
HMI or PLC
connection for on-board keypad
connection for
Local/Remote switch
Fault
Transmit
Receive
Board Power ON
(not to scale)
SG- G
SG+
(for future use)
SR44-RS485 Card
Keypad
Cable
SR44 Main
Circuit Board
Alternative Network
Screw Terminals
Std CAT 5E
Network Cables
Location of
SR44-RS485
Serial Card
fitted on
SR44 main
circuit board
SR44-RS485
Communication
Card and Switch
dot for
alignment
Serial Communication and the soft starter’s integral Local Keypad are mutually exclusive. Only one function
can control the starter at a time. Switching to “Local” will always disable remote control of the starter.
Chapter 7: Optional Hardware