Wiring Overview Outline; General Instructions; Bacnet Ms/Tp Link - Trane HUV Installation, Operation And Maintenance Manual

Wired Controllers—Communication Wiring

Wiring Overview Outline

General
Instructions
(p. 66)
BACnet MS/TP
Link
Setting the
Address (p.
Power Supply
Wiring
Requirements
(p. 68)

General Instructions

Conformance to Regulatory Standards
All wiring must comply with the National Electrical Code™
(NEC™) and local electrical codes.
Connecting Wires to Terminals
To connect wires to the UC400 controller or the expansion
modules:
1. Strip the wires to expose 0.28 inch (7 mm) of bare wire.
2. Insert the wire into a terminal connector.
3. Tighten the terminal screw to 0.5 to 0.6 N-m (71 to
85 ozf-in or 4.4 to 5.3 lbf-in.).
4. Tug on the wires after tightening the screws to ensure
all wires are secure as shown on the right.

BACnet MS/TP Link

Setting the Address
The rotary address dials on the UC400 controller serve one
or two purposes depending upon the network: they are
always used for the MAC Address, which is sometimes all
66
Connection
66) Wiring (p. 67)
Power ON Check
(p. 68)
or part of the BACnet Device ID (refer to the illustration
below).
IM C
24
VAC
XFRM
AO1 AO2
UI 1 UI 2
BI 4 BI 5
1
ADDRESS
BO1 BO2 BO3
0 0 0
x100 x10 x1
RELAYS TRIAC SUPPLY
BO1 BO2 BO3
NO NC C NO NC C NO NC C A
Use a 1/8 inch (3.2 mm) flathead screwdriver to set rotary address
dials. Dials rotate in either direction.
MAC Address.
The MAC Address is required by the RS-
485 communication protocol on which BACnet operates. A
UC400 controller can use a MAC Address from 001 to 120.
Important: Each device on the link must have a unique
MAC Address/Device ID. The controller
rotary addresses should be sequentially set,
with no gaps in the numbering, starting with
001 on each link (for example 001, 002, 003,
004 and so on). A duplicate address or a 000
address setting will interrupt
communications and cause the Tracer SC
device installation process to fail.
BACnet Device ID.
The BACnet Device ID is required by
the BACnet network. Each device must have a unique
number from 001 to 4094302.
BACnet networks without a Tracer SC system
controller
On BACnet networks without a Tracer SC system
controller, the Device ID can be assigned one of two ways:
• It can be the same number as the MAC Address,
determined by the rotary address dials on the UC400
controller. For example, if the rotary address dials are
set to 042, both the MAC Address and the BACnet
Device ID are 042.
• It can be soft set using the Tracer TU service tool. If the
BACnet Device ID is set using the Tracer TU service
tool, the rotary address dials only affect the MAC
Address, they do not affect the BACnet Device ID.
BACnet networks with a Tracer SC system
controller
On BACnet networks with a Tracer SC system controller,
the Device ID for the UC400 controller is always soft set by
the system controller using the following scheme
illustrated below.
P 1 P 2
LINK IMC
TX
RX
SERVI C E
SERVICE TOOL
BO4 BO5 BO6 BO7 BO8 BO9
CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS
TRIACS
B BO4 BO5 BO6 BO7 BO8 B BO9 A
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