McQuay MicroTech III Installation And Maintenance Manual
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McQuay MicroTech III Installation And Maintenance Manual

Chiller unit controller modbus communication module
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Installation and Maintenance Manual
®
MicroTech
III
Chiller Unit Controller
®
Modbus
Communication Module
™
Pathfinder
Chiller, Model AWS
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.
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
NOTICE
Use the appropriate McQuay
IM 969
Group: Controls
Part Number: IM 969
Date: January 2010
Supercedes: New

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Summary of Contents for McQuay MicroTech III

  • Page 1 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.

  • Page 2: Table Of Contents

    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.

  • Page 3: Revision History

    Implementation Guide v1.0 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.

  • Page 4: 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.

  • Page 5: Description

    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.

  • Page 6: Light Emitting Diodes (Leds)

    Red flashing with 2Hz = Software error. Hardware error. In 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.

  • Page 7: Modbus Network Connector

    , 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...

  • Page 8: Figure 4. Diagram Of Board-To-Board Connector

    Figure 4. Diagram of Board-to-Board Connector Figure 5. Modbus Communication Module with Board-to-Board Connector Inserted IM 969...

  • Page 9: Installation

    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.

  • Page 10: Replacing An Existing Modbus Communication Module

    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.

  • Page 11: Integration

    Refer to the appropriate MicroTech III Chiller Unit Controller Operation Manual for default values and keypad operating instructions. Refer to McQuay Protocol Document ED 15121 for descriptions of the available Modbus variables.

  • Page 12: Figure 6. Microtech Iii Chiller Unit Controller Password Menu And Main Features

    5. Verify the Baud Rate as required by the network and change if necessary. 6. Change “Apply Changes” from No to Yes. Figure 6. MicroTech III Chiller Unit Controller Password Menu and Main Features If a password has Back button...
  • Page 13 BAS. Change remaining parameters as required for your network. Note: To save changes to these parameters, select “Apply Changes” under Modbus Setup. For additional information on using the keypad/display, refer to the appropriate MicroTech III Chiller Unit Controller Operation Manual. Table 1. Network Configuration Menu...

  • Page 14: Service Information

    This document contains the most current product information as of this printing. For the most current product information, please go to www.mcquay.com. All McQuay equipment is sold pursuant to McQuay’s Standard Terms and Conditions of Sale and Limited Product Warranty.

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