McQuay MicroTech III Manual

Installation and Maintenance Manual IM 969
Group: Controls
Part Number: IM 969
Date: January 2010
Supercedes: New
MicroTech®III
Chiller Unit Controller
Modbus®Communication Module
Pathfinder™ Chiller, Model AWS
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

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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

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Revision History
IM 969 January 2010 Initial release.
Reference Documents
Number Company Title Source
ED 15121 McQuay International Protocol Information for MicroTech III Chiller
Unit Controllers, Modbus Networks www.mcquay.com
IM 1002 (50Hz )
IM 997 (60Hz) McQuay International Pathfinder™Air Cooled Chiller Installation
Manual www.mcquay.com
OM 998 McQuay International Pathfinder Air Cooled Chiller Operation Manual www.mcquay.com
- Modbus Modbus over Serial Line Specification &
Implementation Guide v1.0 www.Modbus.org
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.

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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.
!DANGER
Dangers indicate a hazardous situation that will result in death or serious injury if not
avoided.
!WARNING
Warnings indicate potentially hazardous situations, which can result in property damage,
severe personal injury, or death if not avoided.
!CAUTION
Cautions indicate potentially hazardous situations, which can result in personal injury or
equipment damage if not avoided.
!WARNING
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.
!CAUTION
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.
NOTICE
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.

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Description
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
diagnostic capability for certain models of McQuay chillers. Please refer to supporting
literature, available on www.mcquay.com, for additional details about D-Net.
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.
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
r

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Figure 2 shows the location of the major components of the Modbus Communication Module.
Figure 2. Modbus Communication Module Major Components
Light Emitting Diodes (LEDs)
The Modbus Communication Module has a BSP LED and a BUS LED to indicate communication
activity and status of the Modbus Communication Module. These indicators are visible when the
communication module is connected to the MicroTech III Chiller Unit Controller and the unit is
powered on (see Figure 2).
BSP LED
The BSP LED indicates the communication state between the Modbus Communication Module and
the MicroTech III Chiller Unit Controller. The table below describes the status of the BSP LED.
BSP LED Color Meaning
Flashing between Red & Green Board Support Package (BSP) upgrade in progress
Green Communication is established between the communication module
and the unit controller.
Yellow The communication module is capable of communicating to the unit
controller. However, communication is not established.
Red flashing with 2Hz Red flashing with 2Hz = Software error.1
Red Hardware error.1
1In the event that this should occur, cycle power to the unit controller to attempt to clear the problem. Contact the McQuay
Controls Customer Support Group at 866-4MCQUAY (866-462-7829) for additional assistance if necessary.
Network Connector
Channel 0
BUS LED
BSP LED
Network Connector
Channel 1 (Not Used)
+ - Ref

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BUS LEDs
The BUS LED indicates the communication status between the Modbus Communication Module and
the Modbus network. The table below describes the status of the BUS LED.
BUS LED Color Meaning
Green The unit controller is capable of communicating to the network.
Red The unit controller is not capable of communicating to the network.
Orange / Yellow Communication module is initializing.
Modbus Network Connector
An RS-485 connector connects the Modbus Communication Module to the Modbus Network and has
three pins: + , -, and Ref. The Modbus Communication Module has two RS-485 ports, but only the
top connector (Channel 0) is used (see Figure 2).
Board-To-Board Connector
The board-to-board connector connects the MicroTech III Chiller Unit Controller to the Modbus
Communication Module (see Figures 3, 4, and 5).
Figure 3. Modbus Communication Module and Knockout
Knockout
permanently
removed
Board-to-board
connector
Slot in module must line
up with baffle in board-
to-board connecto
r

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Figure 4. Diagram of Board-to-Board Connector
Figure 5. Modbus Communication Module with Board-to-Board Connector Inserted

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Installation
The following section describes how to field install a new Modbus Communication Module or
replace an existing Modbus Communication Module on the MicroTech III Chiller Unit Controller so
that it can be incorporated into the Modbus network.
!CAUTION
Electrostatic discharge hazard. Can cause equipment damage.
This equipment contains sensitive electronic components that may be damaged by
electrostatic discharge from your hands. Before you handle a communications module, you
need to touch a grounded object, such as the metal enclosure, in order to discharge the
electrostatic potential in your body.
Contents of the Modbus Communication Module Kit
The following is the list of items included in the field-installed kit:
•The Modbus Communication Module
•Board-to-board connector
•Installation Manual (IM 969)
Installing a new Modbus Communication Module
Follow these steps to install a Modbus Communication Module on the unit controller. The Modbus
Communication Module can be connected directly to the unit controller itself or to an existing
module, if one is attached.
!WARNING
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 Chiller Unit
Controller.
1. Remove power from the unit controller.
2. Remove the knockout on the far left end of the unit controller itself (or additional module, if
present). See Figure 3.
Note: To prevent damage to the unit controller, insert a small screwdriver or other tool to the tab on
the bottom of the unit controller and pull the screwdriver away from the controller.
3. Remove the knockout on the right side of the Modbus Communication Module.
4. Insert the board-to-board connector into the Modbus Communication Module (see Figures 3 and
4). Note that it only fits one way and that the baffles must line up with corresponding slots in
Modbus Communication Module and the unit controller (see Figure 4).
5. Insert the other end of the board-to-board connector to the far-left side of the unit controller or
other device (i.e. module), if attached (see Figure 1).
6. Insert the network cable connector into the Modbus Communication Module (see Figure 2 for
location of network connection port).
7. Power up the unit controller.

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8. The unit controller automatically resets itself approximately 30 seconds after it is powered up.
This reset is necessary so that the Modbus Communication Module is synchronized with the unit
controller.
Note: There is a limit of three devices that can be attached to the left side of the unit controller.
Replacing an Existing Modbus Communication Module
Follow these steps to remove an existing Modbus Communication Module from the unit controller
and replace it with a new Modbus Communication Module.
!WARNING
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 Chiller Unit
Controller.
1. Remove power from the unit controller.
2. Locate the Modbus Communication Module to the left of unit controller (see Figure 1).
3. Pull the network cable connector from the Modbus Communication Module.
4. Grasp the Modbus Communication Module and carefully pull it from unit controller (or from an
adjacent module, if it is attached to one).
5. Install the new Modbus Communication Module (see steps 2-5 from previous section).
6. Insert the network cable connector into the Modbus Communication Module (see Figure 2 for
location of network connection port).
7. Power up the unit controller.
9. The unit controller automatically resets itself approximately 30 seconds after it is powered up.
This reset is necessary so that the Modbus Communication Module is synchronized with the unit
controller.