Table of Contents
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MicroTech II®
Chiller Unit Controller
Modbus® Communication Module
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Use this manual to physically install the communications module into the unit and connect the unit to
your network. You also need the appropriate McQuay Engineering Data Sheet known as Protocol
Information to integrate the unit into your network. Protocol Information contains addressing details,
Modbus® protocol information, and a list of the data points available to the network. See the
Reference Documents section of this document for part numbers of the Protocol Information. These
documents are available from your local McQuay International representative and at the McQuay
International web site: www.mcquay.com.
© 2005 McQuay International
Installation and Maintenance
WSC
Water-Cooled Centrifugal, Single-Compressor
WDC
Water-Cooled Centrifugal, Dual-Compressor
WPV
Water-Cooled Centrifugal, Single-Compressor
HSC
Water-Cooled Single-Compressor Centrifugal, Heat Recovery
HDC
Water-Cooled Dual-Compressor Centrifugal, Heat Recovery
TSC
Water-Cooled Single-Compressor Centrifugal, Templifier
WMC
Water-Cooled Centrifugal, Magnetic Bearing
AGZ
Air-Cooled Global Scroll
ACZ
Air-Cooled Scroll Condensing Unit
WGZ
Water-Cooled Global Scroll
AGS
Air-Cooled Global Screw
WGS
Water-Cooled Global Screw
NOTICE
IM 743-1
Group: Controls
Part Number: IM 743
Date: May 2005
Supersedes: IM 743-0
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Table of Contents
Related Manuals for McQuay IM 743
Summary of Contents for McQuay IM 743
- Page 1 Use this manual to physically install the communications module into the unit and connect the unit to your network. You also need the appropriate McQuay Engineering Data Sheet known as Protocol Information to integrate the unit into your network. Protocol Information contains addressing details, Modbus®...
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Page 2: Table Of Contents
Figure 2. Modbus Communication Module Major Components ............6 Figure 3. Serial Card Slot Location on Unit Controller ................ 8 Figure 4. Serial Card Slot Detail......................8 Figure 5. Network Cable Routing and Connections ................9 Figure 6. Network Connection Detail ....................9 IM 743-1... -
Page 3: Revision History
Network Address and Baud Rate sections. Reference Documents Number Company Title Source ED15063 McQuay International MicroTech II Protocol Information for McQuay www.mcquay.com International Chiller Unit Controllers, Modbus Networks IMM AGS McQuay International MicroTech II Air-Cooled Screw Chiller www.mcquay.com Installation and Maintenance Manual... -
Page 4: Limited Warranty
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 © 2005 McQuay International, Minneapolis MN. All rights reserved throughout the world. McQuay International reserves the right to change any information contained herein without prior notice. -
Page 5: General Information
McQuay International disclaims any liability resulting from any interference or for the correction thereof. -
Page 6: Component Data
Modbus Connector RS-485 Network Connector This connector connects the Modbus Communication Module to the RS-485 network. Function Reference Inverting Input Non-inverting Input 8-Pin Header The 8-pin header connects the MicroTech II Chiller Unit Controller to the Modbus Communication Module. IM 743-1... -
Page 7: Installation
McQuay Parts. The Modbus Communication Module kit includes the Modbus Communication Module (RS-485 serial network board) and this installation manual. The Modbus Communication Module from McQuay Parts is also sold separately (i.e. just the module itself). See Replaceable Parts List for part numbers. -
Page 8: Figure 3. Serial Card Slot Location On Unit Controller
Connect the other wire to Pin 3 of the connector plug. No wire is connected to the remaining pin. Figure 3. Serial Card Slot Location on Unit Controller ® Air Conditioning Serial Card Slot Figure 4. Serial Card Slot Detail 8-Pin Connector for Communication Module IM 743-1... -
Page 9: Figure 5. Network Cable Routing And Connections
Figure 5. Network Cable Routing and Connections Figure 6. Network Connection Detail Pin 2 Pin 3 Net w o r k Cab le IM 743-1... -
Page 10: Replacing An Existing Modbus Communication Module
4. At the MicroTech II Chiller Unit Controller keypad, in the SET UNIT SPs (1) screen, set the setpoint “Source” equal to “BAS”. Use the Operator Password of “100”. Note: See the appropriate Operation Manual for specific instructions for changing variables with the keypad/display. IM 743-1... -
Page 11: Integration
6. Set the Baud Rate variable to the data transmission rate of the network. Configuring the Unit Controller The Modbus Communication Module and MicroTech II Chiller Unit Controller are configured together at the factory. After you set up the network, the unit is ready to operate with the default IM 743-1... - Page 12 Default values may be changed via the network or with the keypad/display. The appropriate Operation Manual provides default values and keypad operation. The MicroTech II Chiller Modbus Protocol Information Document (ED 15063) provides descriptions of the network variables. See Reference Documents section for details. IM 743-1...
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Page 13: Service Information
Check that the ID number Unit Setpoint is set to communications module network address (see Addressing and Establishing Communications section.) • If the Modbus Communication Module still does not respond, contact the McQuay Controls Customer Support group at 866-4MCQUAY (866-462-7829). Replaceable Parts List...