Communication-Link Wiring; Input/Output Terminal Wiring - Trane Tracer MP503 Manual

Figure 6. AC-power wiring for metal enclosure

Communication-link wiring

The Tracer MP503 communicates with the building
automation system (BAS) and with other controllers
®
by means of a LonTalk
communication link. For instructions on LonTalk
communication wiring and addressing, follow the
Tracer Summit Hardware and Software Installation
guide (BMTW-SVN01E), the Tracker Building
Automation System Hardware Installation guide
(BMTK-SVN01D), or another BAS installation
manual.

Input/output terminal wiring

All input/output terminal wiring for the Tracer
MP503 must meet the following requirements:
• All wiring must be in accordance with the
National Electrical Code and local codes.
• Use only 18–22 AWG, stranded, tinned-copper,
shielded, twisted-pair wire.
• Binary output wiring must not exceed 1000 ft
(300 m).
• Binary input and 4–20 mA input wiring must not
exceed 1000 ft (300 m).
• Thermistor input and 0–10 Vdc input wiring must
not exceed 300 ft (100 m).
• Do not run input/output wires in the same wire
bundle with any AC-power wires.
The Tracer MP503 has four binary outputs and four
universal inputs.
Earth-ground
stud
(formerly called Comm5)
24 Vdc outputs
The Tracer MP503 provides power for mA and Vdc
sensors. The DC OUT 24V outputs are current-
limited to 80mA (see Figure 7 on page 6). If sensors
draw more than 80mA, the output of the circuit
drops from 24V to 0V. Periodically, the circuit is
turned On to test the current draw and if the draw is
less than 80mA, the 24V DC OUT output returns to
24Vdc.
Binary outputs
The binary outputs are form A (SPST) relay outputs.
These relays are not dry contacts; they switch
24 Vac. A pilot relay is required for any application
requiring dry contacts. Relays connected to the
binary outputs on the I/O module (see Figure 7 on
page 6) cannot exceed 12 VA or 0.5 A current draw at
24 Vac.
Universal inputs
® Each of the four universal inputs may be configured as:
• Binary
• Thermistor
• 0–20 mA
• 0–10 Vdc
You can configure each input using the device plug-
in and a service tool, such as the Rover™ service
tool. The inputs are software configurable only;
there are no jumpers to set on the circuit board. The
inputs are factory-configured to be thermistors.
Figure 7 on page 6 shows some common sensor types
wired to the Tracer MP503.
5 3270 3332 C