Powell BriteSpot BSG3, Instruction Bulletin

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22 Installation
01.4IB.48040C
BriteSpot™ BSG3
4) Connect Communication Wiring (Two Wire
RS-485 MODBUS)
The only serial protocol that is recognized
by the G3 Conversion Module is 2 wire
RS-485 MODBUS. The device acts as a client
on the network. The wiring table below
refers to Figure 24 and details that terminals
3, 4, and 5 are reserved for the RS-485 port.
Twisted shielded cable shall be used such
as Belden #3105.
Table E Terminals 1-5
Terminal
Number Name
Function
Wire
Gauge
Wire
Type
1 V-
Input Voltage
Negative
22
Unshielded
(<3m)
Shielded
(>3m)
2 V+
Input Voltage
Positive
3 Rx-
Inverting,
2-wire, RS-485
4 Tx+
Non-Inverting,
2 wire, RS-485
Shielded
twisted
pair
5 Shd
Shielding of
communication
pair
5) Grounding
Grounding of the unit can be achieved via
DIN rail contact or via grounding terminal.
a. Grounding via DIN rail
The G3 unit is intended to be mounted
to a grounded DIN rail. For this purpose
unit is equipped with a grounding plate
located on the DIN mounting clip. This
plate provides contact between the G3
chassis and the DIN rail. Use zinc-plated
yellow-chromate steel DIN rail to assure
proper grounding. Secure the DIN rail
to the mounting surface approximately
every 200 mm (8”).
Figure 25 Typical Grounding via Grounded Din
Rail
10/
100
STAT
RST
ID#:
BriteSpot
G3
BS3
BS2
BS1
LINK COM SYS
4 5 6
7 8 9
1 2 3
Ground Bus
Metal Enclosure Wall
Grounded DIN rail
b. Grounding via dedicated PE terminal
and grounding conductor.
The G3 unit is equipped with a
dedicated PE terminal (Terminal 8).
This terminal is internally connected
to grounding DIN clip contact plate.
Use this contact to ground the unit if
grounded DIN rail is not available.
Figure 26 Typical Grounding via PE Terminal
10/
100
STAT
RST
ID#:
BriteSpot
G3
BS3
BS2
BS1
LINK COM SYS
4 5 6
7 8 9
1 2 3
Ground Bus
Enclosure Wall
Grounding Conductor