Automationdirect.com Stellar SR44, User Manual

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1st Ed, Rev B 07/31/2019
SR44 Series Soft Starter User Manual
Chapter 7: Optional Hardware
7.1.2 – Connecting the Communication Card
1) Isolate the SR44 from all electrical power sources.
2) Remove the front cover.
3) For size-2 soft starters (174A & higher), insert the Local/Remote extension cable through the
starter and out the plugged hole in the bottom of the unit. Then connect the Local/Remote
switch to the extension cable.
For size-1 soft starters (146A & below), discard the extension cable.
4) Install the “Local/Remote” label and switch/cable assembly (supplied with SR44-RS485) in the
plugged hole in the bottom left corner of the starter. Orient the switch so that the white dot
faces the ”Remote” side of the label.
5) Install the SR44-RS485 communication card onto the J7 26-pin header (lower middle of main
PCB), and then connect the cover keypad cable from the main PCB board to the 4-pin socket
on the SR44-RS485 communication card.
6) Install the “Local/Remote” cable onto the SR44-RS485 board in the 2-pin socket.
7) Set Communication Card jumpers J1–J5 as shown in Network Connections drawing.
The starter can now communicate via serial communications when the “Local/Remote” switch is
placed in “Remote”. This setting disables the integral keypad on the cover of the starter.
Switching to “Local” will disable serial communication, and enable the integral keypad.
Functions of SR44-RS485 Jumpers J1–J5
• J1: This jumper is for use only with the SR44-KPD Remote Keypad, and only the starter closest
to the keypad should have this jumper installed. It passes 12V through to the RJ45
connectors to supply power to the remote keypad.
• J2: This jumper is for use only with the SR44-KPD Remote Keypad, and only the starter closest
to the keypad should have this jumper installed. It shorts out the 1k
Ω
grounding resistor.
• J3: This jumper connects the serial comms isolated ground to the local unit ground. If multiple
SR44s (with SR44-RS485) are connected, one of them must have this jumper shorted.
• J4: This jumper is for use only with RS-485 networks It connects a 100
Ω
terminating resistor
between the A and B RS485 lines on both the RJ45 and screw terminal connections. Only
the nodes at each physical end of the RS-485 network should have terminating resistors.
• J5: This jumper connects a 1k
Ω
resistor between screw terminal G and local ground. Normally
only the last starter in the network should have this jumper installed.
SR44-RS485
Comms Card
Jumpers J1–J5
Jumpers installed *
(Middle Starters) *
NONE
B A G
SR44
Soft Start
Station 1 *
SR44
Soft Start
Station 2
SR44
Soft Start
Station 3
SR44-RS485
Comms Card
Jumpers J1–J5
Jumpers installed
(Middle Starters)
NONE
B A G
SR44-RS485
Comms Card
Jumpers J1–J5
J4, J5
Jumpers installed
(Last Starter)
B A G
Network Start Network End
Modbus
Master
PLC
Terminating
Resistor (100Ω)
B A G
One PLC Controlling Multiple SR44 Soft Starters via Serial Protocol
(using screw terminals and Belden 9841 or equivalent shielded, twisted-pair cabling)
SG+
SG- G
Legend
for J1–J5
Jumpers:
Jumpers
Uninstalled
Jumpers
Installed
* The ‘Network Start’ terminating resistor is installed at the PLC, and Station 1 is jumpered as a ‘Middle Starter’.
* For RS-485 connection to only one SR44, install jumpers 4, 5.
7–3