McQuay MicroTech III Maintenance Manual

Installation and Maintenance Manual

IM 969

MicroTech® III
Chiller Unit Controller
Modbus

Pathfinder™ Chiller, Model AWS

®

Communication Module

Group: Controls
Part Number: IM 969
Date: January 2010
Supercedes: New

NOTICE

Use this manual to physically install the MicroTech III Communication Module into the chiller unit
controller and connect the chiller unit controller to your network. Use the appropriate McQuay
Engineering Data (ED), known as the Protocol Information document, to integrate the unit into your
network. The Protocol Information document contains addressing details, protocol information, and a list
of the data points available to the network. See the Reference Documents section of this manual for
details. MicroTech III control integration literature is available from your local McQuay International
sales representative and www.mcquay.com

© 2010 McQuay International

.

Table of Contents

Figures .................................................................................................................................................. 2

Revision History ...................................................................................................................................3

Reference Documents........................................................................................................................... 3

Limited Warranty.................................................................................................................................. 3

General Information..............................................................................................................4

Description ............................................................................................................................ 5

Description............................................................................................................................................ 5

Application............................................................................................................................................ 5

Component Data ................................................................................................................................... 5

Light Emitting Diodes (LEDs).......................................................................................................... 6

Modbus Network Connector............................................................................................................. 7

Board-To-Board Connector.............................................................................................................. 7

Installation............................................................................................................................. 9

Contents of the Modbus Communication Module Kit.......................................................................... 9

Installing a new Modbus Communication Module............................................................................... 9

Replacing an Existing Modbus Communication Module................................................................... 10

Integration............................................................................................................................ 11

Connecting to the Network................................................................................................................. 11

Network Topology.......................................................................................................................... 11

Configuring the Modbus Communication Module............................................................................. 11

Modbus Addressing........................................................................................................................ 11

Configuring the Modbus Communication Module using the Keypad/Display............................... 11

Service Information.............................................................................................................14

Test Procedures................................................................................................................................... 14

Parts List............................................................................................................................................. 14

Installation Kit ................................................................................................................................ 14

Figures

Figure 1. Modbus Communication Module Attached to MicroTech III Chiller Unit Controller ......... 5

Figure 2. Modbus Communication Module Major Components.......................................................... 6

Figure 3. Modbus Communication Module and Knockout .................................................................. 7

Figure 4. Diagram of Board-to-Board Connector................................................................................. 8

Figure 5. Modbus Communication Module with Board-to-Board Connector Inserted ........................ 8

Figure 6. MicroTech III Chiller Unit Controller Password Menu and Main Features........................ 12

2 IM 969

Revision History

IM 969 January 2010 Initial release.

Reference Documents

Number Company Title Source

ED 15121 McQuay International Protocol Information for MicroTech III Chiller

IM 1002 (50Hz )
IM 997 (60Hz)

OM 998 McQuay International Pathfinder Air Cooled Chiller Operation Manual www.mcquay.com

- Modbus Modbus over Serial Line Specification &

McQuay International

Limited Warranty

Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find
your local McQuay Representative, go to www.mcquay.com

Notice

Copyright © 2010 McQuay International, Minneapolis MN. All rights reserved throughout the
world.
McQuay International reserves the right to change any information contained herein without prior
notice. The user is responsible for determining whether this software is appropriate for his or her
application.

™ ® The following are trademarks or registered trademarks of their respective companies: Modbus
from Schneider Electric, Inc.; Windows from Microsoft Corporation; MicroTech III, Pathfinder and
D-Net from McQuay International.

Unit Controllers, Modbus Networks

Pathfinder
Manual

Implementation Guide v1.0

™

Air Cooled Chiller Installation

.

www.mcquay.com

www.mcquay.com

www.Modbus.org

3 IM 969

General Information

This manual contains the information you need to install the Modbus® Communication Module on a
MicroTech III Chiller Unit Controller, incorporate it into the Modbus network, and maintain it.

Dangers indicate a hazardous situation that will result in death or serious injury if not
avoided.

Warnings indicate potentially hazardous situations, which can result in property damage,
severe personal injury, or death if not avoided.

Cautions indicate potentially hazardous situations, which can result in personal injury or
equipment damage if not avoided.

Electric shock hazard. Can cause personal injury or equipment damage.

This equipment must be properly grounded. Only personnel knowledgeable in the
operation of the equipment being controlled must perform connections and service to the
MicroTech III Air Handling Unit Controller.

Static sensitive components. Can cause equipment damage.

Discharge any static electrical charge by touching the bare metal inside the control panel
before performing any service work. Never unplug cables, circuit board terminal blocks,
or power plugs while power is applied to the panel.

This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with this instruction manual, may cause interference to
radio communications. It has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. Operation of this equipment in a residential area
is likely to cause harmful interference in which case the user will be required to correct
the interference at his or her own expense. McQuay International disclaims any

liability resulting from any interference or for the correction thereof.

!

DANGER

!

WARNING

!

CAUTION

! WARNING

!

CAUTION

NOTICE

4 IM 969

Description

r

Description

The MicroTech III® Modbus Communication Module incorporates a MicroTech III Chiller Unit
Controller into a Modbus local area network (LAN).

The Modbus Communication Module is a printed circuit board with a plastic enclosure that connects
to the left side of the McQuay D-Net™ Module as shown in Figure 1 or directly to the unit
controller. The Modbus Communication Module provides access to the unit controller variables and
parameters via Modbus.

Note: D-Net Performance Services is an optional feature that provides remote monitoring and

Application

The Modbus Communication Module connects the unit controller to a building automation system
(BAS) on a Modbus local area network. It is the interface for the exchange of Modbus objects
between the network and the unit controller. Refer to the MicroTech III Chiller Unit Controller
Operation Manual for keypad details.

diagnostic capability for certain models of McQuay chillers. Please refer to supporting
literature, available on www.mcquay.com

, for additional details about D-Net.

Component Data

Figure 1 shows the Modbus Communication Module, located on the far left-hand side of the image
below. It is connected to the AWM, which is mounted directly to the unit controller. Figure 2 shows
the important features of the Modbus Communication Module.

Figure 1. Modbus Communication Module Attached to MicroTech III Chiller Unit Controller

Modbus
Communication
Module

D-Net module attached to unit
controlle

5 IM 969