McQuay MicroTech MAG Protocol Manual
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McQuay MicroTech MAG Protocol Manual

McQuay MicroTech MAG Protocol Manual

Absorption chiller open protocol data information packet
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Download this manual See also: Installation & Maintenance Data
Open Protocol Data Information Packet
®
MicroTech
Absorption Chiller
™
Open Protocol
Data Communications
© 2002 McQuay International
Version 2.0
Group: Controls
Date: January 1998

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Summary of Contents for McQuay MicroTech MAG

  • Page 1 Open Protocol Data Information Packet Version 2.0 Group: Controls Date: January 1998 ® MicroTech Absorption Chiller ™ Open Protocol Data Communications © 2002 McQuay International...
  • Page 2 - C O N F I D E N T I A L - This Document may not be copied or reproduced in any way without the express written consent of McQuay International. NOTICE Copyright  1994,1998 McQuay International, Minneapolis MN All rights reserved throughout the world.

  • Page 3: Table Of Contents

    Components ............................5 Connecting to the MicroTech Absorption Gateway ................5 Converting between a Direct Connect and a Network MAG..............5 Diagnostic Variables ..........................6 McQuay Absorption Chiller Variables .................8 Memory Map............................8 Analog Data ............................8 Digital Input Data..........................10 Digital Output Data ..........................

  • Page 4: Purpose

    The purpose of the McQuay International Open Protocol for McQuay absorption chillers is to allow other automation integrators the ability to communicate with a McQuay absorption chiller.  Communications will be established through a MicroTech interface panel that will communicate with the McQuay Absorption Chiller.

  • Page 5: Microtech Absorption Gateway

    This section will be used to explain the MAG hardware components. The components needed will depend upon the number of McQuay chillers. A MAG that is in a network of two or more McQuay Absorption Gateways and an OPM Panel will be referred to as a "Network MicroTech Absorption Gateway."...

  • Page 6: Diagnostic Variables

    Network MAG to a Direct Connect MAG The only way to direct connect to a Network McQuay Gateway is to change the controller address to FF and reset power. This will change Comm Port B to 9600 baud TTY and direct connection will be possible.
  • Page 7 McQuay International Proprietary Information - Subject to Change Communications Check Output 0700 This is the memory location that contains the status of digital output 0. A 0 indicates the output is off and a 1-255 indicates the output is on. This output is on for one second and off for one second if communications exist between the MAG and the Absorption Unit Controller.

  • Page 8: Mcquay Absorption Chiller Variables

    Proprietary Information - Subject to Change McQuay International McQuay Absorption Chiller Variables Memory Map All of these memory locations are in the MAG. All of the following memory locations are in hexadecimal notation. Memory location 1342 will actually be $1342 (Hexadecimal memory location 1342).
  • Page 9 McQuay International Proprietary Information - Subject to Change Description Address Range Units Hot Water Inlet Temperature (Only 11BA Hi Byte 0.1*X+0=°F 11BB Lo Byte for DC-S & DC-H units) 11B4 Hi Byte 0.1*X+0=°F Hot Water Outlet Temperature 11B5 Lo Byte...

  • Page 10: Digital Input Data

    Proprietary Information - Subject to Change McQuay International Hot Water Inlet Temperature 11B8,11B9 This is the Hot Water Inlet Temperature for DC-U units. These locations contain valid data only when the Chiller/Heater is in the heating mode. These locations are read by forming the high byte (11B8) and the low byte (11B9) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
  • Page 11 McQuay International Proprietary Information - Subject to Change Description Address Range Units Auto Restart after Power 1280 0=Disabled Failure BIT 3 1=Enabled Burner Signal 1280 0=Off BIT 0 1=On Chilled Water Flow Rate 1282 0=NoFlow BIT 4 1=Flow Chilled Water Pump Interlock...
  • Page 12 Proprietary Information - Subject to Change McQuay International Description Address Range Units Refrigerant Pump (Alarm) 1281 0=Normal BIT 6 1=Alarm Refrigerant Pump (Off/On) 1283 0=Off BIT 4 1=On Remote Start/Stop Signal 1 1284 0=Stop BIT 6 1=Start Simultaneous Mode 1280...
  • Page 13 McQuay International Proprietary Information - Subject to Change Control Valve 1 (Manual Open) 1284, BIT 3 This is the Manual Open control of Control Valve 1 for Steam units (NC-U). A 0 indicates the control valve is not in the manual open mode and a 1 indicates the control valve is in the manual open mode.

  • Page 14: Digital Output Data

    Proprietary Information - Subject to Change McQuay International Simultaneous Mode 1280, BIT 6 This indicates the unit is in the Simultaneous mode. A 0 indicates that chiller is not in Simultaneous and a 1 indicates that the unit is in Simultaneous mode.
  • Page 15 McQuay International Proprietary Information - Subject to Change Absorbent Pump 1 1286, BIT 1 This is the enable/disable signal to Absorbent Pump 1. A 0 indicates an the pump is disabled and a 1 indicates the pump is enabled. Absorbent Pump 2 1286, BIT 2 This is the status of the on/off signal to Absorbent Pump 2.

  • Page 16: Sw3 Status

    Proprietary Information - Subject to Change McQuay International Operation Indication Contact 1286, BIT 0 This is the status of the chiller. A 0 indicates the unit is off and a 1 indicates the unit is on even during the dilution cycle.

  • Page 17: Start/Stop Data

    McQuay International Proprietary Information - Subject to Change BIT 0 BIT 1 BIT 2 BIT 3 Model TC-U for heavy duty NC-U for heavy duty LC-U LC-U for heavy duty Start/Stop Data Description Address Range Units Absorbent Pump 1 1488-148B...

  • Page 18: Operating Time (Minutes/Seconds)

    Proprietary Information - Subject to Change McQuay International Description Address Range Units Burner Operation 1584-1587 Highest Byte- Lowest Byte Refrigerant Pump Operation 158C-158F Highest Byte- Lowest Byte Unit Operation 1580-1583 Highest Byte- Lowest Byte Absorbent Pump 1 Operation 1588-158B This is the amount of Absorbent Pump 1 operating hours. This number is recorded in BCD format.

  • Page 19: Id Code/Pid Sampling/Data Pointer(S)

    Alarm Pointer 168C This location contains the data pointers for the Abnormal (Alarm) Data. The McQuay Controller contains three alarm buffers. Each of these buffers holds the operating conditions of the chiller when an alarm condition occurred. These three buffers store the operating conditions in a circular buffer pattern.
  • Page 20 Proprietary Information - Subject to Change McQuay International Pointers are used to indicate where the next data is to be written to and to indicate that the buffers are full and the newest data is overwriting the oldest data. The data pointers for the two items are located in byte 168C. The format for these pointers is as...

  • Page 21: Data Setting

    2 and 3 are empty. The McQuay Gateway will automatically sort the alarms from newest to oldest. Alarm Data 1 will always contain the most recent alarm. Alarm Data 2 will contain the previous alarm and Alarm Data 3 will contain the oldest alarm data.
  • Page 22 Proprietary Information - Subject to Change McQuay International Description Address Range Units Hot Water P Setpoint (°F) 1D87 20-100 0.1*X+0=°F Hot Water Setpoint (°F) 1DB0 Hi Byte 0.1*X+0=°F 1DB1 Lo Byte Rank Up Setting (%) 1D83 50-100 Chilled Water D Setpoint 1D86 This location contains the Chilled Water Derivative Setpoint.

  • Page 23: Alarm Data

    McQuay International Proprietary Information - Subject to Change Alarm Data Alarm Data 1 always contains the most recent alarm. Alarm Data 2 contains the previous alarm and Alarm Data 3 contains the oldest alarm. The first memory location is for alarm area 1. The second location is for alarm area 2 and the third location is for alarm data 3.
  • Page 24 Proprietary Information - Subject to Change McQuay International Description Address Range Units Cooling Mode 1780 0=No Cooling BIT 4 1=Cooling Cooling Water Flow Rate 1782 0=No Flow BIT 6 1=Flow Cooling Water Pump Interlock 1782 0=Open BIT 1 1=Closed Exhaust Gas Temperature...
  • Page 25 McQuay International Proprietary Information - Subject to Change Absorbent Pump 1 or Invertor (Alarm) 1781, BIT 1 1981, BIT 1 1B81, BIT 1 This is the alarm status of Absorbent Pump 1 or the Invertor. A 0 indicates normal operation and a 1 indicates an alarm condition.
  • Page 26 Proprietary Information - Subject to Change McQuay International Cooling Water Flow Rate 1782, BIT 6 1982, BIT 6 1B82, BIT 6 This is the status of the Cooling Water Flow Rate. A 0 indicates no flow and a 1 indicates flow.
  • Page 27 McQuay International Proprietary Information - Subject to Change Simultaneous Mode 1780, BIT 6 1980, BIT 6 1B80, BIT 6 This indicates the unit is in the Simultaneous mode. A 0 indicates that chiller is not in Simultaneous and a 1 indicates that the unit is in Simultaneous mode.
  • Page 28 Proprietary Information - Subject to Change McQuay International Description Address Range Units High Temperature Generator 17B8 17B9 Hi Byte Temperature Lo Byte 0.1*X+0= °F Hot Water Inlet Temperature 18B2 18B3 Hi Byte Lo Byte 0.1*X+0= °F Hot Water Outlet 18B4 18B5...
  • Page 29 McQuay International Proprietary Information - Subject to Change Hot Water Outlet Temperature 18B4,18B5 1AB4,1AB5 1CB4,1CB5 This is the Hot Water Outlet Temperature for DC-S and DC-H units. These locations contain valid data only when the Chiller/Heater is in the Heating or Simultaneous mode. These locations are read by forming the high byte (1XB4) and the low byte (1XB5) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
  • Page 30 Proprietary Information - Subject to Change McQuay International Description Address Range Units Fuel Input Valve/Heating Main 188E 0=Off 1=On Mode (Open) BIT 2 Heating Mode Indication 188C 0=Off 1=On BIT 0 Operation Indication 188D 0=Off 1=On BIT 0 Refrigerant Pump Automatic...
  • Page 31 McQuay International Proprietary Information - Subject to Change Cooling Water Pump Signal 188E, BIT 5 1A8E, BIT 5 1C8E, BIT 5 This is the status of the Cooling Water Pump Signal. A 0 indicates a pump off signal and a 1 indicates a pump on signal.
  • Page 32 Proprietary Information - Subject to Change McQuay International Description Address Range Units Absorbent Pump 2 (Alarm) 1981 0=Normal BIT 2 1=Alarm Absorbent Pump 2 (Off/On) 1983 0=Off BIT 0 1=On Auto Restart after Power Failure 1980 0=Disabled BIT 3 1=Enabled...
  • Page 33 McQuay International Proprietary Information - Subject to Change Description Address Range Units High Temperature Generator 1982 0=Normal Pressure BIT 3 1=Alarm Hot Water Pump Interlock 1982 0=Open BIT 0 1=Closed Low Chilled Water Temperature 1985 0=Normal BIT 2 1=Alarm Low Cooling Water Temperature...
  • Page 34 Proprietary Information - Subject to Change McQuay International Description Address Range Units Cooling Water Outlet 19B6 Hi Byte Temperature 19B7 Lo Byte 0.1*X+0=° Exhaust Gas Temperature (DC- 1AB0 Hi Byte *) or Steam Condensate 1AB1 Lo Byte 0.1*X+0=° Temperature (NC-U)
  • Page 35 McQuay International Proprietary Information - Subject to Change Description Address Range Units Cooling Mode Indication 1A8E 0=Off 1=On BIT 7 Cooling Water Pump Signal 1A8E 0=Off 1=On BIT 5 Fuel Input Valve/Cooling Main 1A8E 0=Off 1=On Mode (Close) BIT 1...
  • Page 36 Proprietary Information - Subject to Change McQuay International Description Address Range Units Chilled water Pump Interlock 1B81 0=Open 1=Closed BIT 7 1B80 0=Auto 1=Manual Control Valve 1 (DC-* units) BIT 7 Control Valve 1 1B84 0=Not in Auto (Automatic) (NC-U)
  • Page 37 McQuay International Proprietary Information - Subject to Change Description Address Range Units Simultaneous Mode 1B80 0=No Simul BIT 6 1=Simul See descriptions for Alarm Data 1 above. Alarm Data 3 - SW3 Data Description Address Range Units Unit Model Type...
  • Page 38 Proprietary Information - Subject to Change McQuay International Alarm Data 3 - Digital Output Data Description Address Range Units 1C8D 0=Disabled Absorbent Pump 1 BIT 1 1=Enabled Absorbent Pump 2 1C8D 0=Off 1=On BIT 2 Alarm Indication 1C8C 0=No Alm...

  • Page 39: Glossary Of Terms

    Glossary of Terms Direct Connect MicroTech Absorption Gateway This is the type of gateway used whenever there is only one (1) McQuay absorption chiller to communicate with. This gateway will not work with an OPM or in a MicroTech network.

  • Page 40: Index

    Proprietary Information - Subject to Change McQuay International Index PID Sampling..............19 Processing Alarm Data Output ......6–7 Absorbent Pump 112, 13, 17–19, 23, 27, 30, 32–33, Processing Data Output .........6–7 Purge Pump ........11, 13, 23, 25, 31, 34 Absorbent Pump 1 or Invertor ......12, 23, 33 Rank Up Setting............21...
  • Page 41 13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (763) 553-5330 (www.mcquay.com)

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