EP0453302A1 - Cycle frigorifique avec appareil diagnostique - Google Patents

Cycle frigorifique avec appareil diagnostique Download PDF

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Publication number
EP0453302A1
EP0453302A1 EP91303518A EP91303518A EP0453302A1 EP 0453302 A1 EP0453302 A1 EP 0453302A1 EP 91303518 A EP91303518 A EP 91303518A EP 91303518 A EP91303518 A EP 91303518A EP 0453302 A1 EP0453302 A1 EP 0453302A1
Authority
EP
European Patent Office
Prior art keywords
diagnostic sensor
refrigeration
equipment
sensor unit
network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP91303518A
Other languages
German (de)
English (en)
Inventor
Stephen Lord
Alan Cole
John Robinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whitbread PLC
Whitbread and Co Ltd
Original Assignee
Whitbread PLC
Whitbread and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Whitbread PLC, Whitbread and Co Ltd filed Critical Whitbread PLC
Publication of EP0453302A1 publication Critical patent/EP0453302A1/fr
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/008—Alarm devices
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays

Definitions

  • This invention relates to diagnostic equipment and more particularly to diagnostic equipment to identify faults in refrigeration equipment.
  • Diagnosis of the fault, which caused failure in the equipment is facilitated by applying 'clip-on' or 'plug-in' test equipment and by manually inspecting and testing each of the refrigerator circuit components e.g. the fans or compressors, until the fault is identified and a repair of the equipment is made.
  • the refrigerator circuit components e.g. the fans or compressors
  • An aim of the present invention is to overcome the above disadvantages and provide an in situ diagnostic equipment to identify faults at the earliest opportunity.
  • a diagnostic sensor unit for monitoring and identifying faults in equipment such as refrigeration units, comprising a microprocessor module powered by an independent power supply to the equipment being monitored, a plurality of inputs for connection to locations in the refrigeration equipment and a status indicator display, wherein the input from the locations is learnt by the microprocessor and any change in the inputs from these locations is compared with the learnt inputs and significant changes indicated as faults on the display.
  • the diagnostic sensor unit can be connected to a data collection device such as a modem.
  • a refrigeration circuit comprising at least one refrigeration unit, a plurality of locations, designating physical parameters around the circuit, being connected to a control box, and a diagnostic sensor unit as set forth in the two preceding paragraphs in situ in the refrigeration circuit so that the diagnostic sensor unit monitors and identifies faults in the refrigeration circuit.
  • the system is designed for the monitoring of faults in, for example, refrigeration equipment and is equally applicable to both single cooling units such as cold cabinets and networked or multiple units (e.g. building air conditioning and public house cellars).
  • the diagnostics are based upon the system diagrammatically shown in Fig. 1 comprising a schematic view of a typical refrigeration circuit.
  • the circuit comprises a condenser 1 cooled by a fan 2, refrigerant is fed from a compressor 3 to the condenser via a control valve 4 to an evaporator 5 also cooled by a fan 6.
  • the refrigerant circulates in the system to provide a refrigeration unit e.g. a cold store display cabinet.
  • the various electrical units of the system are connected with a controller 7 which can also connect the system with other electric control or protection devices at inputs 8.
  • Each cooling unit 9, indicated in chain dotted line, is monitored by a diagnostic sensor unit (DSU) 10 which receives the inputs from the circuit voltage, controllers, temperatures, currents and pressures at 11.
  • the DSU 10 is also connected with a status indicator display 12 indicating the current status of each device being monitored by the DSU 10.
  • DSU diagnostic sensor unit
  • each refrigeration unit 13 to 16 is monitored by a DSU which indicates the status of the particular device.
  • Individual DSU's are linked on a network cable 17 which supplies the electric power and communication media to the units.
  • the network power supply 18 is generated in a single mains transformer (not shown) capable of supplying up to thirty-two stations.
  • Control of the network is via a single network controller 19 which is also used as the primary means of indicating faults.
  • the network may optionally be connected with a modem or other data collection device 20 to enable the alarm or details of the faults diagnosed to be recorded or viewed from a remote location.
  • FIG. 3 An embodiment of a DSU electronic circuit is shown in Fig. 3 and comprises a microprocessor module 21 including a microprocessor 22, a ROM 23, a RAM 24, an EEPROM 25, a system clock 26, an analogue to digital converter (ADC) 27 and a digital interface 28.
  • a microprocessor module 21 including a microprocessor 22, a ROM 23, a RAM 24, an EEPROM 25, a system clock 26, an analogue to digital converter (ADC) 27 and a digital interface 28.
  • ADC analogue to digital converter
  • the ADC 27 is connected with temperature channels 29 and current channels 30, while the digital interface is connected to an opto-isolator circuit 31.
  • the microprocessor module 21 is interfaced with network communications package 32 and a serial communications package 33.
  • the temperature channels 29 include circuitry which performs the function of interfacing up to six temperature sensors 34 to the ADC 27.
  • the main task of this circuit is to amplify the sensor signals into the correct range of the ADC.
  • the circuit of the current channels 30 performs an identical task to the temperature channels the main difference being the sine-wave type signals given out by the sensors. Analysis of the signals is actually conducted through the microprocessor.
  • the opto-isolator 31 is used to monitor for the presence of main voltage in the refrigration equipment.
  • the microprocessor 22 has a built in ADC and digital ports.
  • the system ROM chip 23 holds all of the software used by the DSU.
  • the system RAM chip 24 (Randam Access Memory) holds all the system data and variables while the DSU remains powered up.
  • the EEPROM 25 (Electrically Erasable Read Only Memory) is used to hold all setup data and a full fault history of the refrigeration unit.
  • the advantage of the EEPROM is that the data is retained even when power has been removed.
  • the system clock 26 provides the real time clock for use by the microprocessor 22.
  • the network communications package 32 is an integrated circuit used to translate serial data sent by the microprocessor 22 in the voltage levels used by an RS 485 network.
  • the package also contains a direction pin to determine whether data is being transmitted or received.
  • the serial communications package 33 is an integrated circuit which is used to translate serial data sent by the microprocessor 22 into the correct voltage levels for RS232 communications.
  • the circuit also includes all of the handshaking procedures required by a modem.
  • the function of the software is to store and process up to twelve channels of analogue information collected from the refrigeration circuit, temperature sensors and current sensors. Digital states e.g. the power supply on/off are also monitored. Analogue information is stored in a series of buffers (32 bytes per channel).
  • a sampling window is defined to be active i.e. 'open' when the refrigeration unit is cycling on.
  • the window is 'open' both temperatures and current information is stored. The oldest sample in the buffer is lost as each new sample is stored.
  • faults are identified by comparing the present status of the refrigeration unit with the profile generated during the learning process.
  • the DSU performs all of the diagnostics on the refrigeration equipment and operates as follows:
  • a series of measurements are made of the physical characteristics located around the refrigeration circuit i.e. temperatures, currents, digital states and any other related physical feature of the equipment being monitored. These readings are then compared with the known characteristics of the equipment and significant deviations from the normal readings are indicated as faults.
  • Thermostat position, mains voltage and status of protection devices are thermostat position, mains voltage and status of protection devices.
  • the DSU will read the various parameters at the locations around the refrigeration circuit and, by the application of algorithms, will generate a normal operating profile for the refrigeration unit which constitutes the learning process.
  • the DSU will apply a series of tests which compare the operating profile with the 'learnt profile' to determine e.g. whether the compressor current is greater than normal. Faults will then be indicated using the decisions as the basis.
  • each DSU In a network arrangement in, for example, a public house cellar, the fault status of each DSU would be passed back to the network controller. In cases where the DSU is being applied in isolation, faults are communicated using a series of indicator lamps and/or by a modem link.
  • the type of faults which would be monitored in a cellar cooler would be as follows: Condenser blocked, Evaporator blocked, Thermostat O/C, LP contact, HP contact mains failure, Thermostat S/C, Evaporator fan failed, condenser fan failed and compressor failed.
  • the network controller has two main purposes:
  • Each DSU is allocated a station number between one and thirty-two and the controller will then ask each of these stations to transmit their fault status. On receipt of this status information the network controller will display the fault on a liquid crystal display (LCD).
  • LCD liquid crystal display
  • the network controller will also perform the task of sending out fault status through a modem link.
  • the DSU can also be interrogated using a standard IBM PC type computer or a portable computer unit sold under the trade name PSION organiser.
  • the network power supply for the DSU's are held separate from those of the refrigeration equipment to minimise the possibility of a common mode failure i.e. loss of power masking a fault in the refrigeration unit.
  • Network power is generated using standard power supply techniques, the only requirement is for a mains supply.
  • the DSU of the present invention has a number of advantages over existing monitoring equipment.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP91303518A 1990-04-19 1991-04-19 Cycle frigorifique avec appareil diagnostique Ceased EP0453302A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909008788A GB9008788D0 (en) 1990-04-19 1990-04-19 Diagnostic equipment
GB9008788 1990-04-19

Publications (1)

Publication Number Publication Date
EP0453302A1 true EP0453302A1 (fr) 1991-10-23

Family

ID=10674652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91303518A Ceased EP0453302A1 (fr) 1990-04-19 1991-04-19 Cycle frigorifique avec appareil diagnostique

Country Status (2)

Country Link
EP (1) EP0453302A1 (fr)
GB (1) GB9008788D0 (fr)

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0660050A3 (fr) * 1993-12-23 1997-01-15 Carrier Corp Protection du compresseur par affichage.
WO2000009955A2 (fr) * 1998-08-10 2000-02-24 Diffusion Environmental Systems Ltd. Conditionnement d'air
GB2356725A (en) * 1999-11-29 2001-05-30 Plus Design Ltd Refrigerator monitoring and alarm system
WO2001067014A1 (fr) * 2000-03-09 2001-09-13 Danfoss A/S Procede pour identifier des defauts dans un systeme de refrigeration
EP1209427A1 (fr) * 2000-11-22 2002-05-29 Copeland Corporation Système et méthode d'entretien d'une installation de conditionnement d'air
EP1139041A3 (fr) * 2000-03-31 2002-09-11 SANYO ELECTRIC Co., Ltd. Entrepôt et système de surveillance s'y rapportant
EP1245913A1 (fr) * 2001-03-27 2002-10-02 Copeland Corporation Système diagnostique pour compresseur
EP1245912A2 (fr) * 2001-03-27 2002-10-02 Copeland Corporation Système de diagnostic pour compresseur
WO2003089855A1 (fr) * 2002-04-22 2003-10-30 Danfoss A/S Procede d'evaluation d'une variable de fonctionnement non mesuree dans une installation frigorifique
WO2004055455A1 (fr) * 2002-12-13 2004-07-01 KKW Kulmbacher Klimageräte-Werk GmbH Procede et dispositif pour observer un dispositif de controle de la pression d'installation frigorifique a compression
WO2004094929A1 (fr) * 2003-04-23 2004-11-04 Kendro Laboratory Products, Lp Fonctionnement d'un compresseur a la suite d'une panne d'un capteur
US7290989B2 (en) 2003-12-30 2007-11-06 Emerson Climate Technologies, Inc. Compressor protection and diagnostic system
US7419192B2 (en) 2005-07-13 2008-09-02 Carrier Corporation Braze-free connector utilizing a sealant coated ferrule
US7472557B2 (en) 2004-12-27 2009-01-06 Carrier Corporation Automatic refrigerant charging apparatus
US7552596B2 (en) 2004-12-27 2009-06-30 Carrier Corporation Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication
EP1598612A3 (fr) * 1997-09-29 2009-07-15 Emerson Climate Technologies, Inc. Régulation adaptive pour système de réfrigération avec compresseur à vis à taux d'utilisation à modulation de largeur d'impulsions
US7610765B2 (en) 2004-12-27 2009-11-03 Carrier Corporation Refrigerant charge status indication method and device
US7644591B2 (en) 2001-05-03 2010-01-12 Emerson Retail Services, Inc. System for remote refrigeration monitoring and diagnostics
US7665315B2 (en) 2005-10-21 2010-02-23 Emerson Retail Services, Inc. Proofing a refrigeration system operating state
US7681407B2 (en) 2002-07-08 2010-03-23 Danfoss A/S Method and a device for detecting flash gas
US7685830B2 (en) 2002-04-22 2010-03-30 Danfoss A/S Method for detecting changes in a first media flow of a heat or cooling medium in a refrigeration system
US7712319B2 (en) 2004-12-27 2010-05-11 Carrier Corporation Refrigerant charge adequacy gauge
CN101728815A (zh) * 2008-10-27 2010-06-09 泰州乐金电子冷机有限公司 压缩机
US7752854B2 (en) 2005-10-21 2010-07-13 Emerson Retail Services, Inc. Monitoring a condenser in a refrigeration system
US7878006B2 (en) 2004-04-27 2011-02-01 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system and method
US7885959B2 (en) 2005-02-21 2011-02-08 Computer Process Controls, Inc. Enterprise controller display method
US8100167B2 (en) 2002-10-15 2012-01-24 Danfoss A/S Method and a device for detecting an abnormality of a heat exchanger, and the use of such a device
US8160827B2 (en) 2007-11-02 2012-04-17 Emerson Climate Technologies, Inc. Compressor sensor module
US8290722B2 (en) 2006-12-20 2012-10-16 Carrier Corporation Method for determining refrigerant charge
US8393169B2 (en) 2007-09-19 2013-03-12 Emerson Climate Technologies, Inc. Refrigeration monitoring system and method
US8473106B2 (en) 2009-05-29 2013-06-25 Emerson Climate Technologies Retail Solutions, Inc. System and method for monitoring and evaluating equipment operating parameter modifications
US8495886B2 (en) 2001-05-03 2013-07-30 Emerson Climate Technologies Retail Solutions, Inc. Model-based alarming
US8590325B2 (en) 2006-07-19 2013-11-26 Emerson Climate Technologies, Inc. Protection and diagnostic module for a refrigeration system
US8700444B2 (en) 2002-10-31 2014-04-15 Emerson Retail Services Inc. System for monitoring optimal equipment operating parameters
US8964338B2 (en) 2012-01-11 2015-02-24 Emerson Climate Technologies, Inc. System and method for compressor motor protection
US8974573B2 (en) 2004-08-11 2015-03-10 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US9140728B2 (en) 2007-11-02 2015-09-22 Emerson Climate Technologies, Inc. Compressor sensor module
US9285802B2 (en) 2011-02-28 2016-03-15 Emerson Electric Co. Residential solutions HVAC monitoring and diagnosis
US9310094B2 (en) 2007-07-30 2016-04-12 Emerson Climate Technologies, Inc. Portable method and apparatus for monitoring refrigerant-cycle systems
US9310439B2 (en) 2012-09-25 2016-04-12 Emerson Climate Technologies, Inc. Compressor having a control and diagnostic module
US9480177B2 (en) 2012-07-27 2016-10-25 Emerson Climate Technologies, Inc. Compressor protection module
US9551504B2 (en) 2013-03-15 2017-01-24 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9568226B2 (en) 2006-12-20 2017-02-14 Carrier Corporation Refrigerant charge indication
US9638436B2 (en) 2013-03-15 2017-05-02 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9759465B2 (en) 2011-12-27 2017-09-12 Carrier Corporation Air conditioner self-charging and charge monitoring system
US9765979B2 (en) 2013-04-05 2017-09-19 Emerson Climate Technologies, Inc. Heat-pump system with refrigerant charge diagnostics
US9823632B2 (en) 2006-09-07 2017-11-21 Emerson Climate Technologies, Inc. Compressor data module
CN108369055A (zh) * 2015-12-18 2018-08-03 开利公司 用于监测对容器的电力供应的方法和系统
US10041713B1 (en) 1999-08-20 2018-08-07 Hudson Technologies, Inc. Method and apparatus for measuring and improving efficiency in refrigeration systems
US10488090B2 (en) 2013-03-15 2019-11-26 Emerson Climate Technologies, Inc. System for refrigerant charge verification

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WO1987003988A1 (fr) * 1985-12-24 1987-07-02 Monitronix Limited Systeme sequentiel electronique de decelement de pannes
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WO1988002527A1 (fr) * 1986-09-29 1988-04-07 Shepherd Intelligence Systems, Inc. Systeme de securite pour aeronef
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EP0351833A2 (fr) * 1988-07-20 1990-01-24 Mitsubishi Jukogyo Kabushiki Kaisha Système de diagnostic de défauts pour usines

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064818A (en) * 1979-11-30 1981-06-17 Monitoring the operation of an industrial installation
FR2582430A1 (fr) * 1985-05-23 1986-11-28 Euram Umpi Ltd Procede de transmission de signaux destines, notamment a la surveillance d'equipements particuliers, tels que par exemple des equipements d'alarme installes dans des appartements, et systeme pour la mise en oeuvre de ce procede
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Cited By (122)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6460364B1 (en) 1989-08-10 2002-10-08 Diffusion Environmental Systems, Limited Control unit for air-conditioning
EP0660050A3 (fr) * 1993-12-23 1997-01-15 Carrier Corp Protection du compresseur par affichage.
USRE42006E1 (en) 1995-06-07 2010-12-28 Emerson Climate Technologies, Inc. Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor
EP1598612A3 (fr) * 1997-09-29 2009-07-15 Emerson Climate Technologies, Inc. Régulation adaptive pour système de réfrigération avec compresseur à vis à taux d'utilisation à modulation de largeur d'impulsions
WO2000009955A2 (fr) * 1998-08-10 2000-02-24 Diffusion Environmental Systems Ltd. Conditionnement d'air
WO2000009955A3 (fr) * 1998-08-10 2000-05-25 Diffusion Environmental System Conditionnement d'air
US10041713B1 (en) 1999-08-20 2018-08-07 Hudson Technologies, Inc. Method and apparatus for measuring and improving efficiency in refrigeration systems
GB2356725A (en) * 1999-11-29 2001-05-30 Plus Design Ltd Refrigerator monitoring and alarm system
DE10011110B4 (de) * 2000-03-09 2004-08-26 Danfoss A/S Verfahren zum Entdecken von Fehlern in einer Kühlanlage
DE10011110A1 (de) * 2000-03-09 2001-10-04 Danfoss As Verfahren zum Entdecken von Fehlern in einer Kühlanlage
WO2001067014A1 (fr) * 2000-03-09 2001-09-13 Danfoss A/S Procede pour identifier des defauts dans un systeme de refrigeration
EP1139041A3 (fr) * 2000-03-31 2002-09-11 SANYO ELECTRIC Co., Ltd. Entrepôt et système de surveillance s'y rapportant
US6529133B2 (en) 2000-03-31 2003-03-04 Sanyo Electric Co., Ltd. Repository and monitoring system therefor
EP1209427A1 (fr) * 2000-11-22 2002-05-29 Copeland Corporation Système et méthode d'entretien d'une installation de conditionnement d'air
US6560976B2 (en) 2000-11-22 2003-05-13 Copeland Corporation Data acquisition system and method
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EP2284462A3 (fr) * 2001-03-27 2016-08-10 Emerson Climate Technologies, Inc. Système de diagnostic de compresseur
US7162883B2 (en) 2001-03-27 2007-01-16 Emerson Climate Technologies, Inc. Compressor diagnostic method
US6758050B2 (en) 2001-03-27 2004-07-06 Copeland Corporation Compressor diagnostic system
EP1245913A1 (fr) * 2001-03-27 2002-10-02 Copeland Corporation Système diagnostique pour compresseur
EP1245912A2 (fr) * 2001-03-27 2002-10-02 Copeland Corporation Système de diagnostic pour compresseur
EP1659291A3 (fr) * 2001-03-27 2016-08-03 Emerson Climate Technologies, Inc. Système diagnostique pour compresseur
EP1493981A3 (fr) * 2001-03-27 2005-04-27 Copeland Corporation Système diagnostique pour compresseur
EP1493980A3 (fr) * 2001-03-27 2005-05-04 Copeland Corporation Système diagnostique pour compresseur
CN1821577B (zh) * 2001-03-27 2013-08-14 艾默生环境优化技术有限公司 压缩机诊断系统
EP1245912A3 (fr) * 2001-03-27 2002-12-04 Copeland Corporation Système de diagnostic pour compresseur
US7647783B2 (en) 2001-03-27 2010-01-19 Emerson Climate Technologies, Inc. Compressor diagnostic system
US6758051B2 (en) 2001-03-27 2004-07-06 Copeland Corporation Method and system for diagnosing a cooling system
CN1821578B (zh) * 2001-03-27 2010-12-22 艾默生环境优化技术有限公司 压缩机诊断系统
US7222493B2 (en) 2001-03-27 2007-05-29 Emerson Climate Technologies, Inc. Compressor diagnostic system
US7260948B2 (en) 2001-03-27 2007-08-28 Copeland Corporation Compressor diagnostic system
US7980085B2 (en) 2001-03-27 2011-07-19 Emerson Climate Technologies, Inc. Compressor diagnostic system
US7313923B2 (en) 2001-03-27 2008-01-01 Emerson Climate Technologies, Inc. Compressor diagnostic system for communicating with an intelligent device
US6615594B2 (en) 2001-03-27 2003-09-09 Copeland Corporation Compressor diagnostic system
KR20020076185A (ko) * 2001-03-27 2002-10-09 코우프랜드코포레이션 압축기 진단 시스템
US8065886B2 (en) 2001-05-03 2011-11-29 Emerson Retail Services, Inc. Refrigeration system energy monitoring and diagnostics
US7644591B2 (en) 2001-05-03 2010-01-12 Emerson Retail Services, Inc. System for remote refrigeration monitoring and diagnostics
US8316658B2 (en) 2001-05-03 2012-11-27 Emerson Climate Technologies Retail Solutions, Inc. Refrigeration system energy monitoring and diagnostics
US8495886B2 (en) 2001-05-03 2013-07-30 Emerson Climate Technologies Retail Solutions, Inc. Model-based alarming
US7650758B2 (en) 2002-04-22 2010-01-26 Danfoss A/S Method for evaluating a non-measured operating variable in a refrigeration plant
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