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  • 7/30/2019 Control de Compresores



    Danfoss Turbocor Compressors Inc. ECD-00014-U-R09

    January 2008

    Multiple Compressor Controller

    Featuring ModBus Communications

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    Danfoss Turbocor Compressors Inc.


    Proprietary Notice

    This publication contains information proprietary and confidential to Danfoss Turbocor Compressors Inc. (DTC). Any

    reproduction, disclosure or unauthorized use of this publication is expressly prohibited without written approval from DTC.

    DTC reserves the right to make changes without notice in product or component design as warranted by evolution in user

    needs or progress in engineering or manufacturing technology.

    DTC has exercised its best efforts to ensure that the information contained in this manual is correct. However, no warranty of

    reliability or accuracy is given with respect to the information and DTC shall not be responsible or liable for the correctness

    or suitability of the information or for any error or omission. If you encounter any difficulty in using this manual, please

    forward your query to Danfoss Turbocor Compressors Inc. or its authorized sales agent.

    All brand names and product names used in this manual are trademarks, registered trademarks, or trade names of their

    respective holders.

    For product support issues, contact:

    Product Support

    Danfoss Turbocor Compressors Inc.

    1769 E. Paul Dirac Drive

    Tallahassee, FL 32310


    Telephone: (850) 504-4800

    Fax: (850) 575-2126

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    Danfoss Turbocor Compressors Inc. iECD-00014-U-R09

    1 Multiple Compressor Controller - Overview 1Introduction 1Application 1

    Display Features 1Communication Features 1

    Environment Constraints 1Ordering Details 1

    2 Multiple Compressor Controller - Interface 2Interface Introduction 2

    Hardware I/O Interface Controls 2Controller Interlocks 2

    Communications Interfaces 2Carel Modbus Gateway 2BMS Network Modbus Protocol 2

    3 Multiple Compressor Controller - Functionality 3

    General Control Strategy 3Application Setup Types 3Freeze Control 3Parallel Control Mode 3Staged Control Mode 4

    Staged Control Considerations 4Minimum Off Timers 4

    Alarms 4

    4 Multiple Compressor Controller - Operating Procedures 5Introduction 5PLC Control Panel Operations 5

    Alarms 5General Alarms 5System Alarms 5

    Appendix A Carel Control Panel Display 6PLC Overview 6

    Selection Screens 6Interlock Messages 8

    Interlock Message options 8Viewing Circuits 8

    Circuit Temperature Status 8

    Circuit Pressure Status 9Condenser Fans Status 9Compressor Status 9

    System Setup 10Analog Input Configuration 10Compressor Configuration 11Compressor Configuration 11

    Configuration Screens 12Evaporator Configuration Screens 12

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    Danfoss Turbocor Compressors Inc. iiECD-00014-U-R09

    Controller Stage Settings 14Condenser Configuration 14Modbus Settings 15Miscellaneous Configuration Screens 16

    Compressor Circuit IDs 16Appendix B Drawings 18

    Appendix C Inputs/Outputs 19

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    Multiple Compressor Controller - Overview

    Danfoss Turbocor Compressors Inc. 1


    1 Multiple Compressor Controller - Overview

    1.1 Introduction

    This manual describes the functionality and operation

    of the Multiple Compressor Controller (MCC). The

    controller features generic software that is

    configurable for use with either the basic I/O or the

    expanded I/O hardware platforms. In its expanded

    form, the controller can accommodate up to six



    While the controller algorithm is designed to

    maintain desired set point with minimal varia-

    tions, it could swing depending on the configura-

    tion settings and the system characteristics.

    1.2 Application

    The MCC performs the following primary functions:

    Controls the entire chiller/system and some auxiliary


    Performs monitoring, analysis and fault display.

    1.2.1 Display Features

    The controller features a remote semi-graphic display

    with the ability to:

    View the compressor status and detailed information

    View the input and output status

    View and adjust set points

    View and adjust timers where applicable

    Acknowledge and reset warnings and alarms

    View the alarm history

    Configure the pre-programmed software to suit the

    specific application

    Enable and/or disable inputs and/or outputs that are


    1.2.2 Communication Features

    The MCC communicates with the compressors via

    ModBus, which enables it to read various parameters

    and control the compressors by writing to certain

    parameters. It can act as the centralized controller for

    systems with one to six compressors.

    1.2.3 Environmental Constraints

    The following information provides recommended

    environmental conditions.

    1.3 Ordering Details

    The following information provides the ordering

    details for this controller.

    Environment Range

    Storage -20C to 60C*

    Operation -10C to 60C*

    * Relative humidity less than 80%, non-condensing

    Table 1 Temperature Range

    Description Details

    Part Description Retrofit Controller Kit

    Part Number 111047

    Notes Kit includes Turbocor Specific

    software, temperature sensors,

    remote semi-graphic screen,

    connector kit, and 1.5 meter (5 feet)

    RJ-12 communication cable.

    Table 2 Ordering Details

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    Multiple Compressor Controller - Interface

    Danfoss Turbocor Compressors Inc. 2


    2 Multiple Compressor Controller - Interface

    2.1 Interface Introduction

    The latest model of the Carel pCO series is used, the

    Pco3, which enables very fast communication with the

    compressor by means of the serial port over ModBus.

    2.1.1 Hardware I/O Interface Controls

    Each TT300/TT400 compressor is equipped with the

    following I/O points for controls and interfacing:

    Interlock (voltage-free contact), compressor start/

    stop, 1 * DI

    Numerous parameters including demand, which is

    an input parameter modulating the compressor

    capacity between 0 - 100%, 1 * RS485 Port.

    (1) Status (SPD contact), generic compressor faultstatus, 1* DO

    (2) Compressor run status, based on user-selectable

    motor RPM, 1*DO

    For a detailed list and typical wiring of all I/Os

    available on the Turbocor compressor, refer to

    Drawings (see APPENDIX B). Also refer to pCO3

    manual, document no. 050003290, which