Trane Tracer MP503 Installation And Operation Manual

Installation and
Operation

Tracer MP503
Input/Output Module

CNT-SVX09B-EN

April 2005

CNT-SVX09B-EN

Tracer MP503 Input/Output Module Installation and Operation

This guide and the information in it are the property of American Standard Inc. and may not be used or reproduced in whole or in part,
without the written permission of American Standard Inc. Trane, a business of American Standard, Inc., has a policy of continuous
product and product data improvement and reserves the right to change design and specification without notice.

Although Trane has tested the hardware and software described in this guide, no guarantee is offered that the hardware and software
are error free.

Trane reserves the right to revise this publication at any time and to make changes to its content without obligation to notify any per­son of such revision or change.

Trane may have patents or patent applications covering items in this publication. By providing this document, Trane does not imply
giving license to these patents.

The following are trademarks or registered trademarks of American Standard Inc.: Trane, Tracer, Rover.



™

The following are trademarks or regist er ed trade m ar ks of the i r re sp ec tive companies or organ ization s : BACnet from



™

Printed in the U.S.A.
© 2005 American Standard Inc. All rights reserved

ASHRAE; Neuron, LonMark, LonTalk, and LonWorks from Echelon Corporation; National Electrical Code form the National
Fire Proctection Association, Inc.

CNT-SVX09B-EN

NOTICE:

Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully:

WARNING

Indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation, which, if not avoided, may result in minor or moderate injury.
It may also be used to alert against unsafe practices.

CAUTION

Indicates a situation that may result in equipment damage or property damage.

The following format and symbol conventions appear at appropriate sections throughout this manual:

IMPORTANT

Alerts installer, servicer, or operator to potential actions that could cause the product or system to
operate improperly but will not likely result in potential for damage.

Note:

A note may be used to make the reader aware of useful information, to clarify a point, or to describe
options or alte rnatives.

◆ This symbol precedes a procedure that consists of only a single step.

CNT-SVX09B-EN

Contents

Chapter 1 Overview and specifications . . . . . . . . . . . . . . . . . . 1

Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Storage environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Operating environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Agency listing/compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Additional components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Power transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Input devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Output devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 2 General wiring information. . . . . . . . . . . . . . . . . . . 5

Input/output terminal wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

AC-power wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Communication-link wiring and addressing . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 3 Mounting the module . . . . . . . . . . . . . . . . . . . . . . . 9

Location recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Operating environment requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chapter 4 Applications of the Tracer MP503 . . . . . . . . . . . . . 11

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Binary inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Thermistor inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

0–20 mA inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

0–10 Vdc inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Wiring requirements and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

CNT-SVX09B-EN i

Contents

Chapter 5 Network variable bindings . . . . . . . . . . . . . . . . . . 15

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Network variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Binding network variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Tracer MP503 bindings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Receiving data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Sending data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Examples of network variable bindings . . . . . . . . . . . . . . . . . . . . . . . . . 19

Example 1: Display sensor readings from a Tracer MP503

on a Tracer MP581 operator display . . . . . . . . . . . . . . . . . . . . . . . . 19

Example 2: Display sensor readings from a Tracer MP503

on two different Tracer MP581 operator displays . . . . . . . . . . . . . 21

Example 3: Control a binary output on the Tracer MP503

from a Tracer MP581 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Example 4: Use a sensor reading on a Tracer MP503

to control a pump VFD on a Tracer MP581 . . . . . . . . . . . . . . . . . . 23

Chapter 6 Status indicators for operation and

communication . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Tracer MP503 circuit board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Service Pin button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Interpreting LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Service LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

LonTalk LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Binary output LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Chapter 7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Initial troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Binary output (relay output) troubleshooting. . . . . . . . . . . . . . . . . . . . . 33

Universal input troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

ii CNT-SVX09B-EN

Chapter 1

Overview and specifications

This guide provides installation and configuration information for the
Tracer MP503 input/output (I/O) module, as well as a description of its
operations. The overview includes a product description, spe cifications,
and descriptions of additional components needed in some Tracer MP503
applications.

Product description

The Tracer MP503 I/O module is a field-installed device used to monitor
inputs and control binary outputs. The module has four universal inputs
that can be configured as binary, thermistor, 0–20 mA, or 0–10 Vdc, as
well as four binary outputs.

Storage environment

If a Tracer MP503 I/O module is to be stored for a substantial amount of
time, store it in an indoor environment that meets the following
requirements:

• Temperature: –40° to 185°F (–40° to 85°C)

• Relative humidity: 5–95% , no ncondensing

Operating environment

Operate a Tracer MP503 I/O module in an environment that meets the
following requirements:

• Temperature: –40°F to 158°F (–40°C to 70°C)

• Relative humidity: 5–95% , no n-condensing

Dimensions

Plastic-cover model dimensions
For complete dimensional drawing, see .

• Height: 5.375 in. (137 mm)

• Width: 6.875 in. (175 mm)

• Depth: 2 in. (51 mm)

CNT-SVX09B-EN 1

Chapter 1 Overview and specifications

Metal-cover model dimensions
For complete dimensional drawing, see .

• Height: 9.0 in (25 mm)

• Width: 10.37in. (263 mm)

• Depth: 2.25 in. (58 mm)

Clearances

For wi ring, vent ilation, and maintenance , provide the following minimum
clearances for the module, :

Plastic-cover model
(see Figure 1 on page 3)

• Front: 4.0 in. (102 mm)

• Each side: 1.0 in. (25 mm)

• Top and bottom: 4.0 in. (102 mm)

Metal-cover model
(see Figure 2 on page 3)

• Front: 24.0 in. (610 mm)

• Each side: 2.0 in. (51 mm)

• Top and bottom: 1.0 in. (25 mm)

Power

The transformer must meet the following minimum requirements for the
controller and its output devices:

• 19–30 Vac (24 Vac nominal)

• 50/60 Hz

• 9 VA and 12 VA maximum per binary output utilized

Operating environment

Operate a Tracer ZN517 unitary controller in an indoor environment that
meets the following requirements:

• Temperature: From –40°F to 160°F (–40°C to 70°C)

• Relative humidity: From 5–90%, noncondensing

2 CNT-SVX09B-EN

Figure 1. MP503 plastic-cover model dimensions and clearances

1 in.

(25 mm)

Operating environment

4 in.

(102 mm)

5.625 in.

(143 mm)

Clearances

Dimensions

(160 mm)

5.375 in. (137 mm)

1 in.

(25 mm)

(102 mm)

6.31 in.

Figure 2. MP503 metal-cover model dimensions and clearances

1 in.

(25 mm)

1.875 in.
(48 mm)

4 in.

4 in.

(102 mm)

6.5 in.

(165 mm)

6.875 in.

(175 mm)

2 in. (51 mm)

9 in.

(229 mm)

2 in.

(51 mm)

24 in.

(610 mm)

Clearances

Dimensions

CNT-SVX09B-EN 3

10.37 in.

(263 mm)

width with cover

1 in.

(25 mm)

(178 mm)

2 in.
(51 mm)

1 in.

(25 mm)

2.25 in.

(58 mm)

7 in.

0.28 in.
(7 mm)

9 in.

(229 mm)

10.25 in.

(260 mm)

width without cover

Chapter 1 Overview and specifications

Storage environment

If you are storing a Tracer ZN517 unitary controller for a substantial
amount of time, store it in an indoor environment that meets the
following requirements:

• Temperature: From –40° to 185°F (–40° to 85°C)

• Relative humidity: From 5–95%, noncondensing

Agency listing/compliance

CE—Immunity:

CE—Emissions:

EMC Directive 89/336/EEC
EN 50090-2-2:1996
EN 50082-1:1997
EN 50082-2:1995
EN 61326-1:1997

EN 50090-2-2:1996 (CISPR 22) Class B
EN 50081-1:1992 (CISPR 22) Class B
EN 55022:1998 (CISPR 22) Class B
EN 61326-1:1997 (CISPR 11) Class B

UL and C-UL listed:

Energy Management Equipment—PAZX (UL 916)
UL 94-5V (UL flammability rating for plenum use)
FCC Part 15, Subpart B, Class B

4 CNT-SVX09B-EN

Chapter 2

General wiring information

This chapter provides specifications and general information about wir­ing the Tracer MP503 I/O module. The module requires wiring for:

• Input/output terminals

• AC power to the module

• Communication-link wiring, if the module is to communicate with a

building automation system (BAS) or other LonTalk devices

Input/output terminal wiring

All input/output terminal wiring for the Tracer MP503 I/O module must
meet the following requirements:

• All wiring must comply with the National Electrical Code and local

codes.

• Use only 18 AWG twi sted-pair wire with stranded, tinned-copper con-

ductors. (Shielded wire is recommended.)

• 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.

For detailed wiring information and diagrams, see Chapter 4, “Applica­tions of the Tracer MP503.”

CNT-SVX09B-EN 5

Chapter 2 General wiring information

AC-power wiring

WARNING
HAZARDOUS VOLTAGE!

Disconnect all electric power including remote disconnects before ser­vicing. Follow proper lockout/tagout procedures to insure the power
can not be inadvertently energized during installation or servicing. Fail­ure to disconnect power could result in death or serious injury.

WARNING
Hazardous voltage!

Make sure that the 24 Vac transformer is properly grounded. Failure to
do so could result in death or serious injury and/or damage to equip­ment.

CAUTION

Complete input/output wiring before applying power to the Tracer
MP503 I/O module. Failure to do so may cause damage to the device or
power transformer due to inadvertent connections to power circuits.

CAUTION

To prevent device damage, do not share 24 Vac between devices.

The recommended wire for ac power is 16 AW G (1.3 mm
wiring must comply with National Electrical Code and local codes.

The ac-power connections are in t he t op le ft corner of the T ra cer MP 503 I/
O module (see Figure 3 on page 7).

2

)copper wire. All

6 CNT-SVX09B-EN

AC-power wiring

Figure 3. Connecting ac-power wires to the module

24 Vac
transformer

N
Line
voltage

H

Use a UL-listed Class 2 power transformer supplying a nominal 24 Vac
(20–30 Vac). The transformer must be sized to provide adequate power to
the Tracer MP503 I/O module (10 VA) and output devices, including
relays, t o a maximum of 12 VA per output utilized. The Tracer MP503
may be powered by an existing transformer integral to the controlled
equipment, provided the transformer has adequate power available and
proper grounding is observed.

CNT-SVX09B-EN 7

Chapter 2 General wiring information

Communication-link wiring and
addressing

The Tracer MP503 I/O module communicates with the BAS and with
other devices through a LonTalk communication link.

IMPORTANT

For important instructions on network wiring, refer to the Tracer Sum-
mit Hardware and Software Installation guide (BMTX-SVN01A-EN).

Wiring for the communication link must meet the following require­ments:

• All wiring must comply with the National Electrical Code and local

• 22 AWG Level 4 unshielded communications wire recommended for

• Termination resistors are required for wiring LonTalk devices com-

codes.

most Comm5 installations.

municating on a network. For important instructions on using termi­nation resistors for LonTalk applications, refer to the Tracer Summit
Hardware and Software Installation guide (BMTX-SVN01A-EN).

Each Tracer MP503 I/O module has a unique 12-c haracter alphanumeric
device address for communicating on a BAS network. This address,
referred to as a Neuron ID , is assigned in the factory before the product is
shipped. Each device can be identified by viewing its unique Neuron ID,
which is on a printed label attached to the circuit board of the device.
Additional adhesive-b ack ed, pe el -o ff Neuron I D l abel s are t ethered to th e
device for placing on mechanical prints or unit location worksheets. The
Neuron ID will appear when co mmuni cati on is est abl ish ed wi th a se rvice
tool (such as the Rover service tool) or a BAS. An example Neuron ID is
00-01-64-1C-2B-00.

8 CNT-SVX09B-EN

Chapter 3

Mounting the module

This chapter gives recommendations and requirements for mounting the
Tracer MP503 I/O module.

Location recommendations

Trane recommends locating the Tracer MP503 I/O module:

• Near the controlled equipment to reduce wiring costs

• Where it is easily accessible for service personnel

• Where public access is restricted to minimize the possibility of tam-

pering or vandalism

Operating environment requirements

Operate a Tracer MP503 I/O module in an environment that meets the
following requirements:

• Temperature: –40°F to 158°F (–40°C to 70°C)

• Relative humidity: 5–95% , no n-condensing

CNT-SVX09B-EN 9

Chapter 3 Mounting the module

Mounting recommendations

IMPORTANT

Leave the cover on when mounting the Tracer MP503 I/O module to
avoid the possibility of damaging the circuit board during installation.

Mounting recommendations are as follows:

• Mount the module in any direction, other than with the front of the

cover facing downward.

• Mount using the two

(see Figure 4). Mounting fasteners are not included.

• Attach the module securely so it can withstand vibrations of associ-

ated heating, ventilating, and air-conditioning (HVAC) equipment.

• If the module is mounted in a small enclosed compartment, complete

all wiring connections before securing the mod ule in the compart­ment.

Figure 4. Mounting the Tracer MP503 I/O module

3

/16in. (4.8 mm) radius mounting holes provided

10 CNT-SVX09B-EN

Chapter 4

Applications of the Tracer
MP503

This chapter provides information about the function of inputs and out­puts and examples of wiring for Tracer MP503 applications. The Tracer
MP503 I/O module is a field-installed device. It is use d to monitor inputs
and control binary outputs. The module has four configurable inputs and
four binary outputs.

Inputs

The Tracer MP503 has four inputs. Each input can be configured to be
binary, thermistor, 0–20 mA, or 0–10 Vdc. You may have any mixture of
these input types connected t o the module . The fa ctory-defa ult input ty pe
is thermistor. To change the configuration of the input, use the device
plug-in and a service tool, such as the Rover service tool. No jumpers need
to be set on the circuit board.

Binary inputs

When an input is configured as binary , the Tracer MP503 equates a sig­nal of 0 Vac with open contacts and 24 Vac with closed contacts.

Thermistor inputs

Thermistor inputs are used to measure temperature. They must be Trane
10kΩ (at 25
connected to the Tracer MP503; however, the module will not recognize
the setpoint thumbwheel or fan speed switch that appears on some sen­sors.

o

C) thermistors. Any Trane zone temperature sensor can be

CNT-SVX09B-EN 11

Chapter 4 Applications of the Tracer MP503

0–20 mA inputs

Many common sensors, such as humidity, pressure, and flow sensors, pro­vide a 4–20 mA output. You can install any of these sensors, connect it to
an input on the Tracer MP503, and configure that input for 0–20 mA.

IMPORTANT

Because most sensors have 4–20 mA outputs rather than 0–20 mA out­puts, some scaling is required. The scaling cannot be done at the Tracer
MP503. The Tracer MP503 transmits the raw mA reading.

To power these sensors , 24 Vdc is available from the Tra cer MP503 circuit
board. See Figure 5 on page 13 for wiring details.

0–10 Vdc inputs

The Tracer MP503 can read a value from a sensor that provides a 0–
10 Vdc signal.

IMPORTANT

If you are using a sensor with a smaller range (such as 2–10 Vdc or 6–
9 Vdc), some scaling is required. The scaling cannot be done at the
Tracer MP503. The Tracer MP503 transmits the raw voltage reading.

To power these sensors , 24 Vdc is available from the Tra cer MP503 circuit
board. See Figure 5 on page 13 for wiring details.

Outputs

The binary outputs are form A (SPST) relay outputs. These relays switch
24 Vac; they are not dry contacts. A pilot relay is required for any applica­tion requiring dry contacts . Relays conne cted to the binary out puts on the
module cannot exceed 12 VA or 0.5 A current draw at 24 Vac.

12 CNT-SVX09B-EN

Wiring requirements and options

Figure 5 shows the wiring of each type of input on the Tracer MP503 I/O
module. The figure also shows the wiring for a typical binary output.

Figure 5. Input/output terminal wiring for the Tracer MP503 I/O module

Typical relay on/off

Wiring requirements and options

Typical relay on/off

N
24 Vac

H

Typical relay on/off

Typical relay on/off

Typical 2-wire
4–20 mA
sensor

CNT-SVX09B-EN 13

In

+

–

Not
used

Typical
thermistor

Typ ical
binary
switching
device

LonTalk
communication
link

Out

sensor

+

–

GND

Typical 3-wire
0–10 Vdc sensor

Chapter 4 Applications of the Tracer MP503

14 CNT-SVX09B-EN

Chapter 5

Network variable bindings

This chapter describes how to use network variable bindings in Tracer
MP503 I/O module applications.

Overview

The LonTalk communication protocol allows data to be shared between
devices (stand-alone or with a BAS) on a LonTalk network. This is called
peer-to-peer communication. As an example of peer-to-peer communica­tion, two or more devi ces serving the same space share data, such as a
temperature reading, without having to pass the data through a BAS.

Network variable s are used to share data between devices. The method
used to direct data from one device to another is called network variable
binding, or just binding. A network variable output from one device is
bound to a network variable input on another device. An output variable
from one device can be bound to input variables on many other devices .

Network variables

Each network variable is a standard type. This standard type is referred
to as a standard network variable type (SNVT, pronounced “snivet”). To
bind two variables together they must be the same network variable type.
For example, an output of type SNVT_temp_p can only be bound to an
input of type SNVT_temp_p. For more information about SNVTs, see the
LonMark web site (www.lonmark.org). From that web site you can down­load the official list of SNVTs.

Binding network variables

IMPORTANT

Only LonTalk devices can use network variable binding. Devices on
other communication links do not have this capability.

BAS communication typically does not require the use of network vari­able binding, because a Tracer Summit BCU will automatically bind to
the proper data in a device. However, communication speed may be
increased between two devices by binding their data rather than having
the BAS read the information from one device and then broadcast it to
another.

Use the Rover service tool to create bindings (see the Rover Operation
and Programming guide, EMTX-SVX01B-EN).

CNT-SVX09B-EN 15

Chapter 5 Network variable bindings

Tracer MP503 bindings

The principal purposes of a Tracer MP503 I/O module are to gather data
(sensor readings) for use by a BAS or peer device and to allow a BAS or
peer device to control Tra ce r MP50 3 b inary out puts. Therefore, the use of
bindings is very important in Tracer MP503 applications.

The examples in this chapter illustrate some common applications in
which bindings are used with the Tracer MP503.

Receiving data

A network variable input (nvi) receives data from other devices on the
LonTalk network. Network variable inputs (including their SNVTs) that
are commonly used in Tracer MP503 bindings are shown in Table 1.

Table 1. Tracer MP503 network variable inputs

Var i able nam e Data type Description

nviBOP1Request SNVT_switch Binary output 1

request

nviBOP2Request SNVT_switch Binary output 2

request

nviBOP3Request SNVT_switch Binary output 3

request

nviBOP4Request SNVT_switch Binary output 4

request

The requested state of binary output 1.
Bind to this nvi to control the binary output from

another device on the network.

The requested state of binary output 2.
Bind to this nvi to control the binary output from

another device on the network.

The requested state of binary output 3.
Bind to this nvi to control the binary output from

another device on the network.

The requested state of binary output 4.
Bind to this nvi to control the binary output from

another device on the network.

16 CNT-SVX09B-EN

Sending data

A network variable output (nvo) sends data to other devices on the Lon­Tal k network. Th e network vari able outputs (inc luding the ir SNVTs) that
are commonly used in Tracer MP503 bindings are shown in Table 2.

Table 2. Tracer MP503 network variable outputs

Var i able name Data type Description

Tracer MP503 bindings

nvoTemperature1 SNVT_temp_p Universal input 1 sta-

tus output

nvoTemperature2 SNVT_temp_p Universal input 2 sta-

tus output

nvoTemperature3 SNVT_temp_p Universal input 3 sta-

tus output

nvoTemperature4 SNVT_temp_p Universal input 4 sta-

tus output

nvoBIP1Status SNVT_switch Universal input 1 sta-

tus output

nvoBIP2Status SNVT_switch Universal input 2 sta-

tus output

nvoBIP3Status SNVT_switch Universal input 3 sta-

tus output

nvoBIP4Status SNVT_switch Universal input 4 sta-

tus output

nvoCurrent1 SNVT_amp_mil Universal input 1 sta-

tus output

nvoCurrent2 SNVT_amp_mil Universal input 2 sta-

tus output

Indicates the value of universal input 1 if it is
configured as thermistor.

If universal input 1 is not configured as ther­mistor, this output is invalid.

Indicates the value of universal input 2 if it is
configured as thermistor.

If universal input 2 is not configured as ther­mistor, this output is invalid.

Indicates the value of universal input 3 if it is
configured as thermistor.

If universal input 3 is not configured as ther­mistor, this output is invalid.

Indicates the value of universal input 4 if it is
configured as thermistor.

If universal input 4 is not configured as ther­mistor, this output is invalid.

Indicates the value of universal input 1 if it is
configured as binary.

If universal input 1 is not configured as
binary, this output is invalid.

Indicates the value of universal input 2 if it is
configured as binary.

If universal input 2 is not configured as
binary, this output is invalid.

Indicates the value of universal input 3 if it is
configured as binary.

If universal input 3 is not configured as
binary, this output is invalid.

Indicates the value of universal input 4 if it is
configured as binary.

If universal input 4 is not configured as
binary, this output is invalid.

Indicates the value of universal input 1 if it is
configured as 0–20 mA.

If universal input 1 is not configured as 0–20
mA, this output is -3276.8.

Indicates the value of universal input 2 if it is
configured as 0–20 mA.

If universal input 2 is not configured as 0–20
mA, this output is -3276.8.

CNT-SVX09B-EN 17

Chapter 5 Network variable bindings

Table 2. Tracer MP503 network variable outputs

Variable name Data type Description

nvoCurrent3 SNVT_amp_mil Universal input 3 sta-

tus output

nvoCurrent4 SNVT_amp_mil Universal input 4 sta-

tus output

nvoVolts1 SNVT_volt Universal input 1 sta-

tus output

nvoVolts2 SNVT_volt Universal input 2 sta-

tus output

nvoVolts3 SNVT_volt Universal input 3 sta-

tus output

nvoVolts4 SNVT_volt Universal input 4 sta-

tus output

nvoBOP1Status SNVT_switch Binary output 1

status output

nvoBOP2Status SNVT_switch Binary output 2

status output

nvoBOP3Status SNVT_switch Binary output 3

status output

nvoBOP4Status SNVT_switch Binary output 4

status output

Indicates the value of universal input 3 if it is
configured as 0–20 mA.

If universal input 3 is not configured as 0–20
mA, this output is -3276.8.

Indicates the value of universal input 4 if it is
configured as 0–20 mA.

If universal input 4 is not configured as 0–20
mA, this output is -3276.8.

Indicates the value of universal input 1 if it is
configured as 0–10 Vdc.

If universal input 1 is not configured as 0–10
Vdc, this output is -3276.8.

Indicates the value of universal input 2 if it is
configured as 0–10 Vdc.

If universal input 2 is not configured as 0–10
Vdc, this output is -3276.8.

Indicates the value of universal input 3 if it is
configured as 0–10 Vdc.

If universal input 3 is not configured as 0–10
Vdc, this output is -3276.8.

Indicates the value of universal input 4 if it is
configured as 0–10 Vdc.

If universal input 4 is not configured as 0–10
Vdc, this output is -3276.8.

Indicates the value of binary output 1.

Indicates the value of binary output 2.

Indicates the value of binary output 3.

Indicates the value of binary output 4.

18 CNT-SVX09B-EN

Examples of network variable bindings

Examples of network variable bindings

The following examples show four common uses of bindings in Tracer
MP503 applications.

Example 1: Display sensor readings from a Tracer
MP503 on a Tracer MP581 operator display

In this example, four different sensors are connected to a Tracer MP503.
A thermistor reading the outside air temperature is connected to univer­sal input 1 on the Tracer MP503. A 4–20 mA sensor reading the outside
air humidity is connected to universal input 2. Two binary inputs from a
fire panel (Alarm Status and Fire Panel Trouble) are connected to univer­sal input 3 and universal input 4, respectively. A Tracer MP581 is on the
same LonTalk link as the Tracer MP503. The Tracer MP581 is controlling
an air-handling unit (AHU). The outside air enthalpy is required to con­trol the economizer on the AHU.

The building operator also wants to know the outside air tempe rature
and humidity, so those values shoul d be displ ayed on the o perator displa y
of the Tracer MP581. The location of the outside air sensors made it con­venient to wire those points to the Tracer MP503 also.

Use bindings to allow the economizer control in the Tracer MP581 to cal­culate outside air enthal py and to disp la y the four in puts from the Tra cer
MP503 on the operator display of the Tracer MP581. Figure 6 shows the
LonTalk network for this example.

Figure 6. LonTalk network for example 1

Tracer MP581 with
operator display

Tracer MP503

®

Additional

LonTalk link

LonTalk
devices

Use the Rover service tool to create bindings. (See the Rover Operation
and Programming guide, EMTX-SVX01B-EN.) Using the Rover service

tool, select the network variable from the Tracer MP503 and then select
the Tracer MP581. The Rover service tool shows you only the variables in
the Tracer MP581 of the SNVT that matches the variable you selected in
the Tracer MP503.

CNT-SVX09B-EN 19

Chapter 5 Network variable bindings

Table 3 shows the bindings needed.

Table 3. Bindings for example 1

Network variable output on the

Tracer MP503

nvoTemperature1 binds to

nvoCurrent2 binds to

nvoBIP3Status binds to

nvoBIP4Status binds to

1

The Tracer MP581 has 40 generic temperature (SNVT_temp_p) network variable
inputs available for binding (nviTemp01 through nviTemp40).

2

The Tracer MP581 has 8 generic current (SNVT_amp_mil) network variable inputs
available for binding (nviCurrent_mA01 through nviCurrent_mA08).

3

The Tracer MP581 has 40 generic binary (SNVT_switch) network variable inputs
available for binding (nviSwitch01 through nviSwitch40).

Network variable input on

the Tracer MP581

nviTemp01

nviCurrent_mA01

nviSwitch01

nviSwitch01

1

2

3

3

Once you have completed the bindings, you need to program the Tracer
MP581 to display this data on the operator disp lay. Remember that the
outside air humidit y is being transmitted over the network in units of
mA. Some custom programming is required in the Tracer MP581 to con­vert the humidity from units of mA to units of percent (%). Custom pro­gramming in the Tracer MP581 will also use the outside air temperature
and humidity to calculate the outside air enthalpy and use it to control
the economizer of the AHU.

20 CNT-SVX09B-EN

Examples of network variable bindings

Example 2: Display sensor readings from a Tracer
MP503 on two different Tracer MP581 operator displays

This example builds on example 1 and shows that bindings can be “one to
many.” In this example, a second Tracer MP581 is added to the system
described in example 1. The second Tracer MP581 also controls an AHU .
This AHU also requires the outside air enthalpy in order to control its
economizer. As in example 1, us e bindi ngs t o allow the economiz er control
in the second Tracer MP581 to calculate outside air enthalpy.

Figure 7 shows the LonTalk network for this example.

Figure 7. LonTalk network for example 2

Tracer MP581 #1
with operator display

Tracer MP581 #2
with operator display

Tracer MP503

®

Additional

LonTalk link

LonTalk
devices

Use the Rover service tool to create bindings. (See the Rover Operation
and Programming guide, EMTX-SVX01B-EN.) Using the Rover service

tool, select the network variable from the Tracer MP503 and then select
the second Tracer MP581. The Rover servi ce tool sho ws yo u only the va ri­ables in Tracer MP581 #2 of the SNVT that matches the variable you
selected in the Tracer MP503.

Table 4 shows the bindings needed between the Tracer MP503 and Tracer
MP581 #2.

CNT-SVX09B-EN 21

Table 4. Bindings for example 2

Network variable output on

the Tracer MP503

nvoTemperature1 binds to

nvoCurrent2 binds to

1

The Tracer MP581 has 40 generic temperature (SNVT_temp_p) network variable
inputs available for binding (nviTemp01 through nviTemp40).

2

The Tracer MP581 has 8 generic current (SNVT_amp_mil) network variable inputs
available for binding (nviCurrent_mA01 through nviCurrent_mA08).

Network variable input on

Tracer MP581 #2

nviTemp01

nviCurrent_mA01

1

2

Again, after you have completed the bindings, you need to program
Tracer MP581 #2 to calculate enthalpy from the outside air temperature

Chapter 5 Network variable bindings

and humidity. Custom programming is also required to display this data
on the operator display of Tracer MP581 #2. Remember that the outside
air humidity is being transmitted over the network in units of mA. Some
custom programming is required in Tracer MP581 #2 to convert the
humidity from units of mA to units of percent (%) before performing the
enthalpy calculation.

Example 3: Control a binary output on the Tracer
MP503 from a Tracer MP581

This example shows an nvi on the Tracer MP503 being bound, which
allows a binary output on the Tracer MP503 to be controlled by another
device on the LonTalk network. In this example, binary output 1 on the
Tracer MP503 is starting and stopping an exhaust fan. The Tracer
MP503 is communicating via the LonTalk network to a Tracer MP581
that is controlling an AHU. The AHU and the exhaust fan follow the same
schedule; for example, whenever the AHU runs, the exhaust fan runs.

Bind an nvo on the Tracer MP581 to an nvi on the Tracer MP503 so the
AHU and exhaust fan run together. Figure 8 shows the LonTalk network
for this example.

Figure 8. LonTalk network for example 3

Tracer MP581 with
operator display

Tracer MP503

®

Additional

LonTalk link

LonTalk
devices

Use the Rover service tool to create bindings. (See the Rover Operation
and Programming guide, EMTX-SVX01B-EN.) Using the Rover service

tool, select the network variable from the Tracer MP581 and then select
the Tracer MP503. The Rover service tool shows you only the variables in
the Tracer MP503 of the SNVT that matches the variable you selected in
the Tracer MP581.

22 CNT-SVX09B-EN

Table 5 shows the bindings needed.

Table 5. Bindings for example 3

Examples of network variable bindings

Network variable output on

the Tracer MP581

nvoSwitch01

1

The Tracer MP581 has 40 generic binary (SNVT_switch) network variable outputs
available for binding (nvoSwitch01 through nvoSwitch40).

1

binds to nviBOP1Request

Network variable input on

the Tracer MP503

Custom programming in the Tracer MP581 controls nvoSwitch01. Write
a custom program to control nvoSwitch01 on when the AHU is on and off
when the AHU is off. The network binding passes the command to the
binary output on the Tracer MP503.

Example 4: Use a sensor reading on a Tracer MP503 to
control a pump VFD on a Tracer MP581

In this example, a Tracer MP581 is controlling the variable frequency
drive (VFD) of a chilled water pump. We want to use a differential pres­sure sensor (4–20 mA output) to control the speed of this pump. Unfortu­nately, the differential pressure sensor is located more than 1000 ft. away
from the pump, so it cannot be wired direct ly to the universal input on the
Tracer MP581. Install a Tracer MP503 to read the differential pressure
and then use network bindings to send the pressure value to the Tracer
MP581 controlling the chilled water pump VFD.

Figure 9 shows the LonTalk network for this example.

Figure 9. LonTalk network for example 4

Tracer MP581 with
operator display

Tracer MP503

®

Additional

LonTalk link

LonTalk
devices

Use the Rover service tool to create bindings. (See the Rover Operation
and Programming guide, EMTX-SVX01B-EN.) Using the Rover service

tool, select the network variable from the Tracer MP503 and then select
the Tracer MP581. The Rover service tool shows you only the variables in

CNT-SVX09B-EN 23

Chapter 5 Network variable bindings

the Tracer MP581 of the SNVT that matches the variable you selected in
the Tracer MP503.

Table 6 shows the bindings needed.

Table 6. Bindings for example 4

Network variable output on

the Tracer MP503

nvoCurrent1 binds to

1

The Tracer MP581 has 8 generic current (SNVT_amp_mil) network variable inputs
available for binding (nviCurrent_mA01 through nviCurrent_mA08).

Network variable input on the

Tracer MP581

nviCurrent_mA01

1

Once you have completed the bindings, you need to program the Tracer
MP581 to use this data to control the pump speed. Remember that the
differential pressure is being transmitted over the network in units of
mA. Some custom programming is required in the Tracer MP581 to con­vert the differential pressure from units of mA to the proper units of pres­sure. Custom programming in the Tracer MP581 will then use the
pressure to control the speed of the chilled water pump.

24 CNT-SVX09B-EN

Chapter 6

Status indicators for
operation and
communication

This chapter describes the operation and communication status indica­tors on the Tracer MP503 I/O module, including:

• A description of the location and function of the Service Pin button

and the light-emitting diodes (LEDs) located on the module

• A complete list of the diagnostics that can occur, their effect on mod-

ule outputs, and an explanation of how diagnostics are cleared and
the device restored to normal operation

CNT-SVX09B-EN 25

Chapter 6 Status indicators for operation and communication

Tracer MP503 circuit board

Figure 10 shows the location of the Service Pin button, the Neuron ID
and label, and the LEDs on the Tracer MP503 I/O module circuit board.

Figure 10. Tracer MP503 I/O module circuit board

Service Pin button

Binary output 2
LED (green)

Binary output 1
LED (green)

Binary output 4
LED (green)

Binary output 3
LED (green)

Status LED
(green)

Neuron chip

LonTalk LED
(yellow)

Service
LED (red)

Service Pin button

The Service Pin button is located as shown in Figure 10. The Service Pin
button is used to:

• Identify a device (see “Identifying a device” in the Rover Operation

• Add a device to the active group (see “Adding a device” in the Rover

• Verify PCMCIA communications (see “Verifying PCMCIA communi-

• Make the Status (green) LED “wink” to verify that the module is com-

26 CNT-SVX09B-EN

Neuron ID label
(on back of terminal block)

and Programming guide, EMTX-SVX01B-EN)

Operation and Programming guide)

cations” in the Rover Operation and Programming guide)

municating on the link (see Table 8 on page 27 and “Setting the auto­wink option” in the Rover Operation and Programming guide)

Interpreting LEDs

Interpreting LEDs

Service LED

The red Service LED (see Figure 10 on page 26) indicates whether the
module is capable of operating normally. See Table 7.

Table 7. Red Service LED

LED activity Explanation

LED is off continuously
when power is applied to
the module.

LED is on continuously
when power is applied to
the module.

LED flashes once every
second.

1

Restore the module to normal operation using the Rover service tool. Refer to the
Rover Operation and Programming guide (EMTX-SVX01B-EN) for more information.

The module is operating normally.

The module is not working properly, or some­one is pressing the Service Pin button.

The module is not executing the application
software because the network connections
and addressing have been removed.

1

Status LED

The green Status LED (see Figure 10 on page 26) indicates whether the
module has power applied to it. See Table 8.

Table 8. Green Status LED

LED activity Explanation

LED is on continuously. Power is on (normal operation).

LED blinks (1/4 second on, 1/4
second off for 10 seconds).

LED is off continuously. Either the power is off or the module has

1

By sending a request from the Rover service tool, you can request the green LED on
the module to blink (“wink”), a notification that the module received the signal and
is communicating.

The auto-wink option is activated, and the
module is communicating.

malfunctioned.

1

CNT-SVX09B-EN 27

Chapter 6 Status indicators for operation and communication

LonTalk LED

The yellow LonTalk LED (see Figure 10 on page 26) indicates the commu­nications status of the module. See Table 9.

Table 9. Yellow LonTalk LED

LED activity Explanation

LED is off continuously. The module is not detecting any communication

LED blinks. The module detects communication (normal for

LED is on continuously. Abnormal condition. This condition often indi-

Binary output LEDs

Four green LEDs on the Tracer MP503 circuit board indicate the status of
the four binary outputs. The location of each LED is shown in Figure 10
on page 26. Table 10 shows the LED number for each binary output.

(normal for stand-alone applications).

communicating applications, including data
sharing).

cates that external noise is affecting the Tracer
MP503.

Table 10. LED numbers for binary output LEDs

Binary output LED number

1CR8

2CR9

3 CR10

4 CR11

Note:

Each binary output LED reflect s the sta tus of the output rel ay on t he
circuit board. It may or may not reflect the status of the equipment
the binary output is controlling. Field wiring determines whether or
not the state of the binary output LED also applies to status of the
end device. Table 11 describes the LED states.

Table 11. Binary output LEDs

LED activity Explanation

LED is on continuously. The relay output is energized.

LED is off continuously. The relay output is de-energized or there is no

power to the board.

28 CNT-SVX09B-EN

Diagnostics

Diagnostics do not affect the operation of the Tracer MP503. When the
diagnostic clears, the module resumes normal operation. Table 12 lists
the diagnostics for the Tracer MP503.

All diagnostics generated by the Tracer MP503 are automatic (non-latch­ing) diagnostics. They clear automatically when the problem that gener­ated the diagnostic is solved.

Table 12. Diagnostics

Diagnostic Probable cause Consequence Diagnostic type

Diagnostics

Normal The Tracer MP503 has just

been powered or a clear alarm
command has just been sent
to the Tracer MP503.

24 Vdc failure The 24 Vdc circuit is no longer

providing the correct supply
voltage.

Input configuration
changed

The configuration of one of the
inputs has been changed.

None—this is expected
behavior.

All binary outputs go off. Automatic (non-latching)

None—this is information
only.

N/A

Automatic (non-latching)

CNT-SVX09B-EN 29

Chapter 6 Status indicators for operation and communication

30 CNT-SVX09B-EN

Chapter 7

Troubleshooting

This chapter outlin es some general troubleshooting steps that should be
performed if there is a problem with the operation of the equipment con­trolled by the Tracer MP503. This chapter describes some common prob­lems; however, it cannot describe ever y possible problem. T roubleshooti ng
that involves accessing live electrical devices must be conducted only by a
properly trained and authorized electrician or trained technician.

If you encounter operational problems with the Tracer MP503 I/O mod­ule, you must first perform initial troubleshooting steps; see “Initial trou­bleshooting” on page 32.

After you have performed the initial troubleshooting steps, refer to spe­cific sections in this chapter to further diagnose the following operational
problems:

• If a binary output is not turning on the equipment wired to it, see

“Binary output (re lay output) troubleshooting” on page 33.

• If you see a universal input value that appears incorrect, see “Univer-

sal input troubleshooting” on page 35.

CNT-SVX09B-EN 31

Chapter 7 Troubleshooting

Initial troubleshooting

Always perform the initial troubleshooting steps listed in Table 13 before
moving on to the specific area of trouble. Perform the steps in the order
they are listed.

Table 13. Initial troubleshooting steps

Step number Action Probable cause

Step 1 Look at the red Service LED. If it is flashing once per second, the module is

not executing the application software because the network connections and
addressing have been removed. For a complete explanation of this LED
behavior, see Table 7 on page 27 in Chapter 6, “Status indicators for opera­tion and communication.”

Use the Rover service tool to restore normal operation. See the Rover Opera-
tion and Programming guide (EMTX-SVX01B-EN) for more information.

Step 2 Look at the green Status LED. It should be on continuously during normal

operation. A blinking Status LED indicates abnormal behavior for the Tracer
MP503. For a complete explanation of this LED behavior, see Table 8 on
page 27 in Chapter 6, “Status indicators for operation and communication.”

Step 3 Use your meter (set to measure ac voltage) to measure the voltage across the

ac power terminals on the Tracer MP503 (with ac wires connected). See
Figure 3 on page 7.

If the voltage is approximately 24 V (20–30 V) on the terminals, the board is
receiving adequate input power. The Tracer MP503 circuit board has a prob­lem.

If the voltage is approximately 0 V, proceed to the next step.

Step 4 Disconnect the ac wires from the input power terminals. Use your meter (set

to measure ac voltage) to measure the voltage across the ac wires.
If the voltage is still approximately 0 V, the board is not receiving the power it

needs to run.

Tracer MP503 is
not configured

Tracer MP503 cir­cuit board prob­lem

Tracer MP503 cir­cuit board prob­lem

Input power prob­lem

32 CNT-SVX09B-EN

Binary output (relay output) troubleshooting

Binary output (relay output)
troubleshooting

If a binary output (re lay out put) i s no t turning o n the equi pment wire d to
it, then follow the troubleshooting steps in Table 14. Perform the steps in
the order they are listed.

The troubleshootin g ste ps as sume th e e quipme nt c onnect ed to t he bi nary
output is off when you think it should be on. The steps are nearly the
same if the equipment is on when you think it should be off.

Table 14. Binary output (relay output) troubleshooting of external wiring

Step number Action Probable cause

Step 1 Perform the initial troubleshooting steps described in Table 13 on page 32

and verify that general board operation is okay.

Step 2 Inspect the wiring. Is there a good connection between the wire and the ter-

minal blocks? Look for shorts or opens. Pay particular attention to wire
splices.

Step 3 Look at the status LED for the binary output you are troubleshooting. (See

“Binary output LEDs” on page 28.) If the LED is on, the Tracer MP503 is
energizing its output relay.

Use your meter (set to measure ac voltage) to measure the voltage across the
binary output terminals you are troubleshooting on the Tracer MP503.

If the voltage is approximately 24 V, the problem lies beyond the Tracer
MP503. Is the wiring to the equipment good? Is there a pilot relay and is it
functioning correctly? Is a Hand-Off-Auto (HOA) switch overriding the
equipment?

If the voltage is approximately 0 V, proceed to the next step.

Step 4 Remove the wires from the binary output terminals and measure the voltage

again.
If the voltage is 24 V, there is a wiring or equipment problem external to the

Tracer MP503.
If the voltage is still approximately 0 V, the Tracer MP503 is commanding the

output to be off and you need to investigate the Tracer MP503 further. See
Table 15 on page 34 to troubleshoot the configuration and operation of the
binary output.

General board
problem

Wiring problem

Wiring problem

Wiring problem

CNT-SVX09B-EN 33

Chapter 7 Troubleshooting

Table 15. Binary output (relay output) troubleshooting of configuration and operation

Step number Action Probable cause

Step 1 Connect the Rover service tool to the LonTalk communication link, start the

Rover service tool, and select the Tracer MP503 you are troubleshooting from
the Active Group Tree. The device plug-in for the selected Tracer MP503 will
appear with the Status screen displayed in the workspace.

See the Rover Operation and Programming guide (EMTX-SVX01B-EN) for
more information.

Step 2 Select the Bindings button to view the Network Variable Bindings Summary

screen for the LonTalk network that includes this Tracer MP503. (The Bindings
button will be disabled if the Tracer MP503 is the only device currently on the
network.) Is this binary output bound? Is it bound to more than one network
device? If it is bound to two devices, one may be commanding the binary
output on while the other commands it off.

For more information about network bindings, see Chapter 5, “Network vari­able bindings.”

Step 3 If the binary output is correctly bound to another device, is that device com-

municating? If it has not communicated for at least 15 minutes, the binary
output will go to its communication loss position. The communication loss
position is configurable using the device plug-in. Proceed to the next step to
view or edit the communication loss position of the binary output.

Step 4 To view the communication loss position of the binary output, select the

Close button to return to the Status screen. Press the Configuration button,
then select the Outputs tab.

The communication loss position for a binary output can be set to On, Off, or
Last State. For example, if you expect the equipment controlled by the binary
equipment to be on but it is off because of the communication loss position,
you may want to change the communication loss position from Off or Last
State to On.

—

Bindings problem

Network commu­nications problem

Incorrect commu­nication loss posi­tion

34 CNT-SVX09B-EN

Universal input troubleshooting

Universal input troubleshooting

If you see a universal input value that appears incorrect, then follow the
troubleshooting steps in the following tabl es:

• Table 16 describes steps you can take using the devic e plug- in to tro u-

bleshoot inputs. You do no t ha ve t o b e at t he mod ule to use t he de vi ce
plug-in to view the inputs.

• T a ble 17 describes troubleshooting input s with a me ter at the modu le .

Table 16. Troubleshooting universal inputs using the device plug-in

Step number Action Probable cause

Step 1 Connect the Rover service tool to the LonTalk communication link, start the

Rover service tool, and select the Tracer MP503 you are troubleshooting from
the Active Group Tree. The device plug-in for the selected Tracer MP503 will
appear with the Status screen displayed in the workspace.

See the Rover Operation and Programming guide (EMTX-SVX01B-EN) for
more information.

Step 2 On the Inputs tab, check the value of each universal input. For thermistor

inputs, the reading is shown in both degrees (Fahrenheit or Celsius) and
Ohms.

If the input does not show the value you expect, proceed to the next step to
verify the input configuration.

Step 3 Select the Configuration button, then select the Inputs tab. For the universal

input you are troubleshooting, view the Input Type.
If it is not correct, select the correct type from the drop-down list. Select the

Download button, then select the Save button.
If the configuration is correct for the input you are troubleshooting, proceed

to Table 17.

Input configura­tion problem

—

—

Table 17. Troubleshooting universal inputs using a meter at the module

Step number Action Probable cause

Step 1 Perform the initial troubleshooting steps described in Table 13 on page 32

and verify that general board operation is okay.

Step 2 Inspect the wiring. Is there a good connection between the wire and the ter-

minal blocks? Look for shorts or opens. Pay particular attention to wire
splices.

Step 3 What type of universal input are you investigating?

General board
problem

Wiring problem

—

• For thermistor, proceed to Table 18 on page 36.

• For binary, proceed to Table 19 on page 36.

• For 0–20 mA, proceed to Table 20 on page 37.

• For 0–10 Vdc, proceed to Table 21 on page 37.

CNT-SVX09B-EN 35

Chapter 7 Troubleshooting

Table 18. Universal input troubleshooting with a thermistor input

Step number Action Probable cause

Step 1 After following the steps in Table 17 on page 35, use your meter (set to read dc

voltage) to measure the voltage across the terminals for the input you are trou­bleshooting. Verify the voltage falls into the gray area of the curve in Figure 11
for the current temperature.

If the voltage reading is not appropriate for the current temperature, you have
a sensor wiring problem.

If the voltage is correct for the current temperature, proceed to the next step.

Step 2 Disconnect the sensor wires from the input terminals. Use your meter (set to

read dc voltage) to measure the voltage across the terminals for the input you
are troubleshooting.

The voltage should be 4.75–5.25 Vdc (see Table 22 on page 38). If the voltage is
not in that range, the Tracer MP503 has a circuit board problem.

Figure 11. Voltage measured across terminals vs. temperature

Voltage (Vdc)

Voltage (Vdc)

Sensor wiring
problem

Circuit board
problem

Temperature (oF)

Figure Note:

The correct region is shown in gray. A range of measurements is shown due to the variability of reference voltages
and thermistors.

Table 19. Universal input troubleshooting with a binary input

Step number Action Probable cause

Step 1 After following the steps in Table 17 on page 35, disconnect the sensor wires

from the input terminals. Use your meter (set to read dc voltage) to measure
the voltage across the terminals for the input you are troubleshooting.

The voltage should be 16.00–18.00 Vdc (see Table 22 on page 38). If the voltage
is not in that range, the Tracer MP503 has a circuit board problem.

36 CNT-SVX09B-EN

Temperature (oC)

Circuit board
problem

Universal input troubleshooting

Table 20. Universal input troubleshooting with a 0–20 mA input

Step number Action Probable cause

Step 1 After following the steps in Table 17 on page 35, use your meter (set to read dc

voltage) to measure the voltage across the terminals for the input you are
troubleshooting. Verify the voltage falls on the curve shown in Figure 12 for
the input current.

If the voltage is not appropriate for the mA reading, you have a sensor wiring
problem.

If the voltage is correct for the mA reading, proceed to the next step.

Step 2 Disconnect the sensor wires from the input terminals. Use your meter (set to

read dc voltage) to measure the voltage across the terminals for the input you
are troubleshooting.

The voltage should be 0.10–0.13 Vdc (see Table 22 on page 38). If the voltage is
not in that range, the Tracer MP503 has a circuit board problem.

Figure 12. Voltage measured across terminals vs. input current

Voltage (Vdc)

Sensor wiring
problem

Circuit board
problem

Table 21. Universal input troubleshooting with a 0–10 Vdc input

Step number Action Probable cause

Step 1 After following the steps in Table 17 on page 35, disconnect the sensor wires

from the input terminals. Use your meter (set to read dc voltage) to measure
the voltage across the terminals for the input you are troubleshooting.

The voltage should be 3.1–3.8 Vdc (see Table 22 on page 38). If the voltage is
not in that range, the Tracer MP503 has a circuit board problem.

CNT-SVX09B-EN 37

Current (mA)

Circuit board
problem

Chapter 7 Troubleshooting

Table 22. Voltage measurements at universal inputs (no sensor
connected)

Input type Expected value Acceptable range

Thermistor 5.00 Vdc 4.75 to 5.25 Vdc

Binary 17.00 Vdc 16.00 to 18.00 Vdc

0–20 mA 0.116 Vdc 0.100 to 0.130 Vdc

0–10 Vdc 3.43 Vdc 3.10 to 3.80 Vdc

38 CNT-SVX09B-EN

Index

Numerics

0–10 Vdc inputs, 4, 2

Troubleshooting, 5, 7

0–20 mA inputs, 4, 2

Troubleshooting, 5, 7

24 Vac wiring, 2

A

AC-power wiring, 2

Addressing

LonTalk communication, 4
Neuron IDs, 4

Agency listing/compliance, 2

Analog inputs

0–10 Vdc inputs, 4, 2
0–20 mA inputs, 4, 2

Applications of the Tracer MP503, 1–4

B

BAS communication, 4

Binary inputs, 4, 1

Troubleshooting, 5, 6

Binary outputs, 2

LEDs, 2, 4
Network variables, 2, 4
Troubleshooting, 3–4
Type of output, 4

Bindings,

bindings

Building automation system

communication, 4

see Network variable

C

CE, see Agency listing/compliance

Circuit board, 2

Clearances, 2

Communication loss position, 4

Communication-link wiring, 4

D

Device addressing for BAS

communication, 4

Diagnosing operational problems, 1–8

Diagnostics, 5

Dimensions, 1

E

Environment

Operating, 1
Storage, 1

F

Fan speed switch, 4

see Agency listing/compliance

FCC,

I

Input devices, 4

Input/output terminal wiring, 1, 3

Inputs

Configuring, 1
Factory default, 1

see also Analog inputs, Binary

inputs,

or Universal inputs

L

LEDs

General, 1
Interpreting binary output, 4
Interpreting LonTalk (yellow), 4
Interpreting Service (red), 3
Interpreting Status (green), 3
Location, 2

Location recommendations, 1

LonTalk communication, 4

LonTalk LED, 2, 4

CNT-SVX09B-EN 39

Index

M

Module, see Tracer MP503 I/O

module

Mounting

Diagram, 2
Location, 1
Operating environment, 1
Recommendations, 2

MP503 module,

O module

MP581,

see Tracer MP581

see Tracer MP503 I/

N

National Electrical Code, 1, 2, 4

Network variable bindings, 1–10

Examples, 5–10
Overview, 1
Using with a BAS, 1

Network variables, 1

Inputs, 2
Outputs, 3–4
Standard types, 1

Neuron IDs

Description, 4
Location of label, 2

nvi, 2

nvo, 3

S

Service LED, 2, 3

Service Pin button, 2

Setpoint thumbwheel, 4

see Standard network

SNVT,

variable type

Specifications

AC power wiring, 2
Agency listing/compliance, 2
Clearances, 2
Dimensions, 1
Input/output terminal wiring, 1
LonTalk communication wiring

and addressing, 4
Storage environment, 1
Transformers, 4, 3

Standard network variable type, 1

Status indicators for operation and

communication, 1–5

Binary output LEDs, 4
LonTalk LED, 4
Service LED, 3
Service Pin button, 2
Status LED, 3

Status LED, 2, 3

Storage environment, 1

T

U

UL, see Agency listing/compliance

Universal inputs

Network variables, 3–4
Troubleshooting, 5–8
Types of inputs, 4
Voltage measurements, 8
Voltage vs. input current, 7
Voltage vs. temperature, 6

V

Voltage measurements at universal

inputs, 8

W

Wiring

AC power, 2
BAS communication, 4
Cautions and warnings, 2
Compliance with National

Electrical Code, 1, 2, 4
Diagram, 3
General, 1–4
Input/output terminals, 1
LonTalk communication, 4
Requirements, 1, 4

O

Operating environment, 1

Output devices, 4

Outputs, 2

see also Binary outputs

P

Peer-to-peer communication, 1

Power transformers, 4, 2

Power wiring, 2

Product description, 1

R

Relay outputs, see Binary outputs

Rover service tool, 4, 2

Terminal wiring, 1

Termination resistors, 4

Thermistor inputs, 4, 1

Troubleshooting, 5, 6

Tracer MP503 I/O module

Circuit board, 2
Description of, 1
Location of LEDs, 2
Mounting, 1–2
Overview and specifications,

1–4

Wiring diagram, 3

Tracer MP581, example use with

network variable bindings, 5–10

Transformers, 4, 2, 3

Troubleshooting, 1–8

Binary outputs (relay outputs),

3–4
General, 1
Initial steps, 2
Universal inputs, 5–8

40 CNT-SVX09B-EN