Installation and Maintenance Manual

Wired Controllers—Communication Wiring
UNT-SVX07D-EN 75
Note: The BACnet Device ID is displayed as the Software
Device ID on the Tracer TU Controller Settings
page in the Protocol group.
Connection Wiring
Field-supplied BACnet MS/TP link wiring must be installed
in compliance with NEC and local codes. The wire must be
low-capacitance, 18-gauge, stranded, tinned-copper,
shielded, twisted-pair. The illustration below shows an
example of BACnet link wiring with multiple UC400
controllers.
Note: For more details, refer to Wiring Guide: Unit
Controller Wiring for the Tracer SC™ System
Controller (BAS-SVN03D-EN, or the most recent
revision).
Power Supply
Please read all of the warnings, cautions, and notices
below before proceeding with this section.
A separate transformer is recommended for each UC400
controller. The line input to the transformer must be
equipped with a circuit breaker sized to handle the
maximum transformer line current.
If a single transformer is shared by multiple UC400
controllers:
• The transformer must have sufficient capacity.
• Polarity must be maintained for every UC400
con
troller powered by the transformer.
Important: If t
he polarity is inadvertently reversed
between two controllers powered by the
same transformer, a difference of 24Vac will
occur between the grounds of each
controller, which can result in:
• Partial or full loss of communication on
the entire BACnet MS/TP link
• Improper function of the UC400
co
ntroller outputs
• Damage to the transfor
mer or a blown
transformer fuse
ADDRESS
0
1
2
3
4
5
6
7
8
9
x1
0
1
2
3
4
5
6
7
8
9
x10
0
1
2
3
4
5
6
7
8
9
x100
001 0201
ADDRESS
0
1
2
3
4
5
6
7
8
9
x1
0
1
2
3
4
5
6
7
8
9
x10
0
1
2
3
4
5
6
7
8
9
x100
ADDRESS
0
1
2
3
4
5
6
7
8
9
x1
0
1
2
3
4
5
6
7
8
9
x10
0
1
2
3
4
5
6
7
8
9
x100
001 0201
ADDRESS
0
1
2
3
4
5
6
7
8
9
x1
0
1
2
3
4
5
6
7
8
9
x10
0
1
2
3
4
5
6
7
8
9
x100
BACnet
Device ID for
this UC400
The first three digits
are determined by the
address rotary dials on
the Tracer SC system
controller.
The fourth digit is
determined by the link
number to which the
UC400 controller is
attached.
The last three digits
are determined by the
rotary address dials
on the UC400
controller.
= 0012001
UC400
L
i
n
k
2
L
i
n
k
1
BI LINK IMC
+
VDC
AIAIAI AI AI
PP
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
BI LINK IMC
+
VDC
AIAIAI AI AI
PP
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
BI LINK IMC
+
VDC
AIAIAI AI AI
PP
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
+
+
BI LINK IMC
+
VDC
AIAIAI AI AI
PP
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
+
BI LINK IMC
+
VDC
AIAIAI AI AI
PP
TX
RX
LINK IM
SERVI
SERVICE TOOL
IM
+
Tracer SC
UC400
UC400
UC400
Zone sensor
communications
jack wiring
Trane BACnet
Terminator
Zone
Sensor
Zone
Sensor
Zone
Sensor
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
CAUTION
Personal Injury and Equipment Damage!
After installation, make sure to check that the 24 Vac
transformer is grounded through the controller. Failure
to check could result in personal injury and/or damage
to equipment. Measure the voltage between chassis
ground and any ground terminal on the UC400
controller. Expected result: Vac £ 4.0 V
NOTICE:
Avoid Equipment Damage!
Sharing 24 Vac power between controllers could cause
equipment damage.
UNT-SVX07_-EN.book Page 75 Friday, April 27, 2012 9:40 AM