CA1151265A - Compressor motor unit and a method of troubleshooting power supply circuits therefor - Google Patents
Compressor motor unit and a method of troubleshooting power supply circuits thereforInfo
- Publication number
- CA1151265A CA1151265A CA000364464A CA364464A CA1151265A CA 1151265 A CA1151265 A CA 1151265A CA 000364464 A CA000364464 A CA 000364464A CA 364464 A CA364464 A CA 364464A CA 1151265 A CA1151265 A CA 1151265A
- Authority
- CA
- Canada
- Prior art keywords
- motor
- current
- switch
- power supply
- compressor motor
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
Abstract
A Compressor Motor Unit And a Method of Troubleshooting Power Supply Circuits Therefor Abstract A compressor motor unit comprising an electric motor, a shell enclosing the motor, and an electric power supply circuit. The power supply circuit includes an electrically conductive conduit for connecting the motor to a source of electric current, a switch positioned within the shell and electrically located in the conduit, the switch changing from a closed, current conductive state to an open, current non-conductive state to selectively terminate operation of the motor, and a bypass circuit for conducting current around the switch and through the motor.
Description
~151Z65 A Compressor Motor ~nit and A Method of Troubleshooting Power Supply Circuits Therefor This invention generally relates to compreæsor motor units, particularly hermetically or semi-hermetically sealed motors, and more specifically to a method of troubleshooting power supply circuits therefor.
The utilization of electrically driven motor-compressor units which are enclosed within hermetically or semi-hermetically sealed shells has become increasingly prevalent in recent years, particularly in refrigeration applications wherein the motor-compressor unit is employed to compress a refrigerant vapor. Inmany of these motor-compressor units, the electric power supply circuit for the-motor includes a switch responsive-to motor conditions such as temperature or current. This switch, generally referred to as an internal line break switch, is positioned within the sealed shell and is typically directly secured to the motor.
The internal line break switch is electrically located between the motor nnd an electric current source, and the switch is normally closed for conducting current from the source to the motor.
However, if the switch senses the development of an undesirable condition such as excessive motor temperature, the switch opens, disconnecting the motor from the electric current source and thereby terminating operation of the motor. When the undesirable ~151Z65 condition is alleviated, the internal line break switch recloses, allowing the motor to restart.
Because the internal line break switch is located within the hermetically or semi-hermetically sealed shell, it may be difficult to determine whether the switch is open or closed.
Under certain circumstances, this may make it difficult for a mechanic or serviceman to determine why a motor is not operating.
For example, if the motor is not operating while external factors appear to indicate it should be operating, the internal line break switch may be closed and the motor inoperative because it is defective. Alternately, the motor may not be operating only because the internal line break switch is open. In the vast majority of cases, most servicemen and mechanics are quickly able to correctly determine why a motor is not operating. However, occasionally mistakes are made. For example, a mechanic may conclude that a motor is not operating because it is defective when in fact the motor is not defective but is not operating only because the internal line break switch is properly, temporarily terminating operation thereof. On the basis of this mistaken conclusion, the mechanic may return the motor to the manufacturer for repair or replacement, causing an unnecessary inconvenience to all parties involved and a waste of time, money, and other resources.
In accordance with teachings of the present invention, these and other prior art difficulties may be overcome with a compressor motor unit comprising an electric motor, a shell enclosing the motor, and an electric power supply circuit. The power supply circuit includes electrically conductive conduit means for connecting the motor to a source of electric current, a switch positioned within the shell and electrically located in the conduit means, the switch changing from a closed, current conductive state to an open, current non-conductive state to . . . :.
~151Z65 selectively terminate operation of the motor, and a bypass circuit for conducting current around the switch and through the motor.
This invention will now be described, by way of example, with reference to the accompanying drawing which is a schematic representation of a compressor motor unit employing teachings of the present invention.
Referring to the drawing, there is depicted a schematic representation of electric power supply circuit 10. Circuit 10 connects electric compressor motor 12 to a source of electrical energy, represented in the drawing by lines L1 and L2. As will become apparent to those skilled in the art, the present invention may be employed with numerous types of electric motors. In the preferred embodiment illustrated in the drawing, though, motor 12 is a single phase induction motor including main or run winding 14 and auxiliary or start winding 16, with the windings 14 and 16 electrically located in parallel with respect to each other.
Also, as will be obvious to those skilled in the art, circuit 10 and motor 12 may be used with numerous types of electric energy sources. One suitable type, for example, provides an alternating current of approximately 230 volts with a frequency of about 60 Hert~.
Circuit 10 includes lines ~3, L4, L5, and L6, with start switch 18 located in line L3, capacitor 20 positioned in line L4, resistor 22 located in line L5, and normally closed internal line break switch 24 positioned in line L6. Preferably, supply circuit 10 includes a plurality of additional devices not shown in the drawing. For example, circuit 10 may include thermostatic switches, indicator lights, and safety switches such as a low oil pressure cutout switch. Such devices are well known in the art, and they have been omitted from the drawing for the sake of clarity.
1151~65 Referring back to the illustration of the drawing, run winding 14 is connected to electrical energy source Ll, L2 via lines L3 and L6, and start winding 16 is connected to the electrical energy source via lines L3, L4, and L6. With this arrangement, closure of start switch 18 connects motor 12, specifically windings 14 and 16 thereof, across lines L1 and L2, thereby starting the motor.
As is well known in the art, capacitor 20 produces a phase difference between the currents passing through run and start windings 14 and 16, increasing the torque produced thereby. Motor 12 is enclosed within shell 26, and preferably the motor is hermetically or semi-hermetically sealed within the shell.
Internal line break switch 24 is also located within shell 26.
Preferably, switch 24 is physically directly secured to motor 12 and senses one or more parameters thereof such as current or temperature. As mentioned above, internal line break switch 24 is normally closed, however, if the switch senses the development of an unsatisfactory condition, for example excessive motor temperature, the switch opens.
As explained earlier, with prior art compressor motor units of the general type described above, when the internal line break switch opens, the compressor motor is disconnected from the electric current source and operation of the motor is temporarily terminated. Also, as previously discussed, with this typical prior art arrangement a serviceman or mechanic may occasionally have some difficulty learning why a motor is not operating.
Specifically, it may be difficult to determine if the line break switch is open. In light of this, circuit 10 of the present invention includes a bypass circuit, specifically line L5 and resistor 22, for conducting a current around switch 24 and through motor 12. More particularly, resistor 22 is located in line IS
electrically in parallel with switch 24, and preferably the resistance of resistor 22 is sufficiently great, for example lO,000 or 15,000 ohms, so that the magnitude of the current flow therethrough, while measurable, is less than the magnitude . .
. .
'. . ~
~ ~15~
necessary to operate motor 12. With this arrangement, when only switch 24 is open, motor 12 is temporarily rendered inoperative, but circuit 10 is still complete and current passes therethrough.
This fact may be advantageously employed by a serviceman or mechanic to facilitate troubleshooting circuit 10. More specifically, if a cause located in circuit 10 prevents motor 12 from operating, a mechanic can test to determine if this cause is an open internal line break switch 24. This troubleshooting test is made by connecting circuit 10 to a current source, for example source Ll, L2 may be used or a test current source having a much lower voltage may be used. Then the mechanic measures the magnitude of current passing through resistor 22. If this magnitude is greater than zero, then circuit 10 is complete and the probable cause for the inoperative motor 12 is only an open switch 24. However, if the measured current magnitude is zero, then circuit 10 is broken and it is highly probable that a cause other than an open switch 24, for example a defective motor 12 or a break in line L6, prevents the motor from operating.
It should be noted that electric lines (not shown) may extend from each end of resistor 22 to the exterior of shell 26 to allow an easy, direct measurement of the current passing through the resistor. Preferably, however, this current is indirectly measured by simply measuring the current through lines L3 and L6.
As will be appreciated by those skilled in the art, if a break in circuit 10 or an open switch 24 prevents motor 12 from operating, the magnitude of the current passing through lines L3 and L6 .
equals the magnitude of the current passing through resistor 22.
Moreover, in practice, it may be easier to measure the resistance of circuit 10 instead of the current passing therethrough or through resistor 22. As will be apparent to those skilled in the art, if the sole cause for an inoperative motor 12 is an open line break switch 24, the resistance of circuit 10 substantially equals the resistance of resistor 22. In contrast, in the huge majority , .~ .
~, . ' , :
~lS1~6~
of other cases where a cause in circuit 10 prevents motor 12 from operating, the resistance of the circuit is essentially infinite.
The above-described current and resistance tests are quick, highly reliable, and simple to understand and apply. In many circumstances the tests reduce the time needed by a mechanic to locate the reason why a motor is not operating. This, in turn, decreases the cost of troubleshooting a non-operating motor and increases the productivity of the mechanic. Moreover, the present invention improves the accuracy of the troubleshooting process.
Specifically, the present invention enables a mechanic to identify with a high degree of reliability those situations where a motor is not operating only because of an open line break switch. Thus, the possibility is greatly reduced that a mechanic will mistakenly believe a defect in the power supply circuit or motor prevents operation thereof while the fact is only the internal line break switch is open. Hence, the present invention may be effectively employed to reduce the number of motors erroneously returned to the manufacturer for repair or replacement. This eliminates, for example, much of the heretofore wasted time, money, and effort of the manufacturer devoted to checking properly functioning units that are mistakenly alleged to be defective.
While it is apparent that the invention herein disclosed is well calculated to fulfill the objects above stated, it will be appreciated that numerous modifications and embodiments may be devised by those skilled in the art, and it is intended that the appended claims cover all such modifications and embodiments as fall within the true spirit and scope of the present invention.
;' ' ' :
.
The utilization of electrically driven motor-compressor units which are enclosed within hermetically or semi-hermetically sealed shells has become increasingly prevalent in recent years, particularly in refrigeration applications wherein the motor-compressor unit is employed to compress a refrigerant vapor. Inmany of these motor-compressor units, the electric power supply circuit for the-motor includes a switch responsive-to motor conditions such as temperature or current. This switch, generally referred to as an internal line break switch, is positioned within the sealed shell and is typically directly secured to the motor.
The internal line break switch is electrically located between the motor nnd an electric current source, and the switch is normally closed for conducting current from the source to the motor.
However, if the switch senses the development of an undesirable condition such as excessive motor temperature, the switch opens, disconnecting the motor from the electric current source and thereby terminating operation of the motor. When the undesirable ~151Z65 condition is alleviated, the internal line break switch recloses, allowing the motor to restart.
Because the internal line break switch is located within the hermetically or semi-hermetically sealed shell, it may be difficult to determine whether the switch is open or closed.
Under certain circumstances, this may make it difficult for a mechanic or serviceman to determine why a motor is not operating.
For example, if the motor is not operating while external factors appear to indicate it should be operating, the internal line break switch may be closed and the motor inoperative because it is defective. Alternately, the motor may not be operating only because the internal line break switch is open. In the vast majority of cases, most servicemen and mechanics are quickly able to correctly determine why a motor is not operating. However, occasionally mistakes are made. For example, a mechanic may conclude that a motor is not operating because it is defective when in fact the motor is not defective but is not operating only because the internal line break switch is properly, temporarily terminating operation thereof. On the basis of this mistaken conclusion, the mechanic may return the motor to the manufacturer for repair or replacement, causing an unnecessary inconvenience to all parties involved and a waste of time, money, and other resources.
In accordance with teachings of the present invention, these and other prior art difficulties may be overcome with a compressor motor unit comprising an electric motor, a shell enclosing the motor, and an electric power supply circuit. The power supply circuit includes electrically conductive conduit means for connecting the motor to a source of electric current, a switch positioned within the shell and electrically located in the conduit means, the switch changing from a closed, current conductive state to an open, current non-conductive state to . . . :.
~151Z65 selectively terminate operation of the motor, and a bypass circuit for conducting current around the switch and through the motor.
This invention will now be described, by way of example, with reference to the accompanying drawing which is a schematic representation of a compressor motor unit employing teachings of the present invention.
Referring to the drawing, there is depicted a schematic representation of electric power supply circuit 10. Circuit 10 connects electric compressor motor 12 to a source of electrical energy, represented in the drawing by lines L1 and L2. As will become apparent to those skilled in the art, the present invention may be employed with numerous types of electric motors. In the preferred embodiment illustrated in the drawing, though, motor 12 is a single phase induction motor including main or run winding 14 and auxiliary or start winding 16, with the windings 14 and 16 electrically located in parallel with respect to each other.
Also, as will be obvious to those skilled in the art, circuit 10 and motor 12 may be used with numerous types of electric energy sources. One suitable type, for example, provides an alternating current of approximately 230 volts with a frequency of about 60 Hert~.
Circuit 10 includes lines ~3, L4, L5, and L6, with start switch 18 located in line L3, capacitor 20 positioned in line L4, resistor 22 located in line L5, and normally closed internal line break switch 24 positioned in line L6. Preferably, supply circuit 10 includes a plurality of additional devices not shown in the drawing. For example, circuit 10 may include thermostatic switches, indicator lights, and safety switches such as a low oil pressure cutout switch. Such devices are well known in the art, and they have been omitted from the drawing for the sake of clarity.
1151~65 Referring back to the illustration of the drawing, run winding 14 is connected to electrical energy source Ll, L2 via lines L3 and L6, and start winding 16 is connected to the electrical energy source via lines L3, L4, and L6. With this arrangement, closure of start switch 18 connects motor 12, specifically windings 14 and 16 thereof, across lines L1 and L2, thereby starting the motor.
As is well known in the art, capacitor 20 produces a phase difference between the currents passing through run and start windings 14 and 16, increasing the torque produced thereby. Motor 12 is enclosed within shell 26, and preferably the motor is hermetically or semi-hermetically sealed within the shell.
Internal line break switch 24 is also located within shell 26.
Preferably, switch 24 is physically directly secured to motor 12 and senses one or more parameters thereof such as current or temperature. As mentioned above, internal line break switch 24 is normally closed, however, if the switch senses the development of an unsatisfactory condition, for example excessive motor temperature, the switch opens.
As explained earlier, with prior art compressor motor units of the general type described above, when the internal line break switch opens, the compressor motor is disconnected from the electric current source and operation of the motor is temporarily terminated. Also, as previously discussed, with this typical prior art arrangement a serviceman or mechanic may occasionally have some difficulty learning why a motor is not operating.
Specifically, it may be difficult to determine if the line break switch is open. In light of this, circuit 10 of the present invention includes a bypass circuit, specifically line L5 and resistor 22, for conducting a current around switch 24 and through motor 12. More particularly, resistor 22 is located in line IS
electrically in parallel with switch 24, and preferably the resistance of resistor 22 is sufficiently great, for example lO,000 or 15,000 ohms, so that the magnitude of the current flow therethrough, while measurable, is less than the magnitude . .
. .
'. . ~
~ ~15~
necessary to operate motor 12. With this arrangement, when only switch 24 is open, motor 12 is temporarily rendered inoperative, but circuit 10 is still complete and current passes therethrough.
This fact may be advantageously employed by a serviceman or mechanic to facilitate troubleshooting circuit 10. More specifically, if a cause located in circuit 10 prevents motor 12 from operating, a mechanic can test to determine if this cause is an open internal line break switch 24. This troubleshooting test is made by connecting circuit 10 to a current source, for example source Ll, L2 may be used or a test current source having a much lower voltage may be used. Then the mechanic measures the magnitude of current passing through resistor 22. If this magnitude is greater than zero, then circuit 10 is complete and the probable cause for the inoperative motor 12 is only an open switch 24. However, if the measured current magnitude is zero, then circuit 10 is broken and it is highly probable that a cause other than an open switch 24, for example a defective motor 12 or a break in line L6, prevents the motor from operating.
It should be noted that electric lines (not shown) may extend from each end of resistor 22 to the exterior of shell 26 to allow an easy, direct measurement of the current passing through the resistor. Preferably, however, this current is indirectly measured by simply measuring the current through lines L3 and L6.
As will be appreciated by those skilled in the art, if a break in circuit 10 or an open switch 24 prevents motor 12 from operating, the magnitude of the current passing through lines L3 and L6 .
equals the magnitude of the current passing through resistor 22.
Moreover, in practice, it may be easier to measure the resistance of circuit 10 instead of the current passing therethrough or through resistor 22. As will be apparent to those skilled in the art, if the sole cause for an inoperative motor 12 is an open line break switch 24, the resistance of circuit 10 substantially equals the resistance of resistor 22. In contrast, in the huge majority , .~ .
~, . ' , :
~lS1~6~
of other cases where a cause in circuit 10 prevents motor 12 from operating, the resistance of the circuit is essentially infinite.
The above-described current and resistance tests are quick, highly reliable, and simple to understand and apply. In many circumstances the tests reduce the time needed by a mechanic to locate the reason why a motor is not operating. This, in turn, decreases the cost of troubleshooting a non-operating motor and increases the productivity of the mechanic. Moreover, the present invention improves the accuracy of the troubleshooting process.
Specifically, the present invention enables a mechanic to identify with a high degree of reliability those situations where a motor is not operating only because of an open line break switch. Thus, the possibility is greatly reduced that a mechanic will mistakenly believe a defect in the power supply circuit or motor prevents operation thereof while the fact is only the internal line break switch is open. Hence, the present invention may be effectively employed to reduce the number of motors erroneously returned to the manufacturer for repair or replacement. This eliminates, for example, much of the heretofore wasted time, money, and effort of the manufacturer devoted to checking properly functioning units that are mistakenly alleged to be defective.
While it is apparent that the invention herein disclosed is well calculated to fulfill the objects above stated, it will be appreciated that numerous modifications and embodiments may be devised by those skilled in the art, and it is intended that the appended claims cover all such modifications and embodiments as fall within the true spirit and scope of the present invention.
;' ' ' :
.
Claims (6)
1. A compressor motor unit comprising an electric motor; a shell enclosing the motor; and an electric power supply circuit including electrically conductive conduit means for connecting the motor to a source of electric current, a switch positioned within the shell and electrically located in the conduit means, the switch changing from a closed, current conductive state to an open, current non-conductive state to selectively terminate operation of the motor, and a bypass circuit for conducting current around the switch and through the motor and having a resistance sufficiently high to prevent said electric current source from driving the compressor motor by means of current conducted through the bypass circuit.
2. The compressor motor unit as defined by claim 1 wherein the bypass circuit includes a resistor electrically located in parallel with the switch.
3. The compressor motor unit as defined by claim 2 wherein the resistor has a high impedance.
4. The compressor motor unit as defined by claim 3 wherein the impedance of the resistor is greater than 10,000 ohms.
5. A method of troubleshooting an electric power supply circuit for a compressor motor that is enclosed within a shell, the circuit including a line break switch physically located within the shell and electrically located in series between an electric current source and the compressor motor to selectively conduct current therebetween, the method comprising the steps of connecting the supply circuit to a source of electric current; and measuring the magnitude of current passing through a high impedance bypass circuit provided for conducting current around the line break switch and through the motor.
6. The method as defined by claim 5 wherein the measuring step includes the step of measuring the resistance of the power supply circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10680379A | 1979-12-26 | 1979-12-26 | |
| US106,803 | 1979-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151265A true CA1151265A (en) | 1983-08-02 |
Family
ID=22313350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000364464A Expired CA1151265A (en) | 1979-12-26 | 1980-11-12 | Compressor motor unit and a method of troubleshooting power supply circuits therefor |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5694278A (en) |
| CA (1) | CA1151265A (en) |
| DK (1) | DK515680A (en) |
| FR (1) | FR2472862A1 (en) |
| IT (1) | IT1134714B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7162883B2 (en) | 2001-03-27 | 2007-01-16 | Emerson Climate Technologies, Inc. | Compressor diagnostic method |
| US9669498B2 (en) | 2004-04-27 | 2017-06-06 | Emerson Climate Technologies, Inc. | Compressor diagnostic and protection system and method |
| US9762168B2 (en) | 2012-09-25 | 2017-09-12 | Emerson Climate Technologies, Inc. | Compressor having a control and diagnostic module |
| US9803902B2 (en) | 2013-03-15 | 2017-10-31 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification using two condenser coil temperatures |
| US10234854B2 (en) | 2011-02-28 | 2019-03-19 | Emerson Electric Co. | Remote HVAC monitoring and diagnosis |
| US10274945B2 (en) | 2013-03-15 | 2019-04-30 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US10443863B2 (en) | 2013-04-05 | 2019-10-15 | Emerson Climate Technologies, Inc. | Method of monitoring charge condition of heat pump system |
| US10558229B2 (en) | 2004-08-11 | 2020-02-11 | Emerson Climate Technologies Inc. | Method and apparatus for monitoring refrigeration-cycle systems |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6615594B2 (en) * | 2001-03-27 | 2003-09-09 | Copeland Corporation | Compressor diagnostic system |
| US8590325B2 (en) | 2006-07-19 | 2013-11-26 | Emerson Climate Technologies, Inc. | Protection and diagnostic module for a refrigeration system |
| US20080216494A1 (en) | 2006-09-07 | 2008-09-11 | Pham Hung M | Compressor data module |
| US20090037142A1 (en) | 2007-07-30 | 2009-02-05 | Lawrence Kates | Portable method and apparatus for monitoring refrigerant-cycle systems |
| US8393169B2 (en) | 2007-09-19 | 2013-03-12 | Emerson Climate Technologies, Inc. | Refrigeration monitoring system and method |
| US9140728B2 (en) | 2007-11-02 | 2015-09-22 | Emerson Climate Technologies, Inc. | Compressor sensor module |
| US8160827B2 (en) | 2007-11-02 | 2012-04-17 | Emerson Climate Technologies, Inc. | Compressor sensor module |
| US8964338B2 (en) | 2012-01-11 | 2015-02-24 | Emerson Climate Technologies, Inc. | System and method for compressor motor protection |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2811019A (en) * | 1956-02-28 | 1957-10-29 | Westinghouse Electric Corp | Overload protection circuits for motors of refrigerant compressors |
| US3978382A (en) * | 1974-12-16 | 1976-08-31 | Lennox Industries Inc. | Control apparatus for two-speed, single phase compressor |
-
1980
- 1980-11-12 CA CA000364464A patent/CA1151265A/en not_active Expired
- 1980-12-03 DK DK515680A patent/DK515680A/en not_active Application Discontinuation
- 1980-12-04 JP JP17145280A patent/JPS5694278A/en active Granted
- 1980-12-12 IT IT26620/80A patent/IT1134714B/en active
- 1980-12-18 FR FR8026929A patent/FR2472862A1/en active Granted
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7162883B2 (en) | 2001-03-27 | 2007-01-16 | Emerson Climate Technologies, Inc. | Compressor diagnostic method |
| US7222493B2 (en) | 2001-03-27 | 2007-05-29 | Emerson Climate Technologies, Inc. | Compressor diagnostic system |
| US7980085B2 (en) | 2001-03-27 | 2011-07-19 | Emerson Climate Technologies, Inc. | Compressor diagnostic system |
| US9669498B2 (en) | 2004-04-27 | 2017-06-06 | Emerson Climate Technologies, Inc. | Compressor diagnostic and protection system and method |
| US10335906B2 (en) | 2004-04-27 | 2019-07-02 | Emerson Climate Technologies, Inc. | Compressor diagnostic and protection system and method |
| US10558229B2 (en) | 2004-08-11 | 2020-02-11 | Emerson Climate Technologies Inc. | Method and apparatus for monitoring refrigeration-cycle systems |
| US10234854B2 (en) | 2011-02-28 | 2019-03-19 | Emerson Electric Co. | Remote HVAC monitoring and diagnosis |
| US10884403B2 (en) | 2011-02-28 | 2021-01-05 | Emerson Electric Co. | Remote HVAC monitoring and diagnosis |
| US9762168B2 (en) | 2012-09-25 | 2017-09-12 | Emerson Climate Technologies, Inc. | Compressor having a control and diagnostic module |
| US10274945B2 (en) | 2013-03-15 | 2019-04-30 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US9803902B2 (en) | 2013-03-15 | 2017-10-31 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification using two condenser coil temperatures |
| US10488090B2 (en) | 2013-03-15 | 2019-11-26 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification |
| US10775084B2 (en) | 2013-03-15 | 2020-09-15 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification |
| US10443863B2 (en) | 2013-04-05 | 2019-10-15 | Emerson Climate Technologies, Inc. | Method of monitoring charge condition of heat pump system |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2472862A1 (en) | 1981-07-03 |
| IT1134714B (en) | 1986-08-13 |
| DK515680A (en) | 1981-06-27 |
| JPS5694278A (en) | 1981-07-30 |
| IT8026620A0 (en) | 1980-12-12 |
| JPS6341428B2 (en) | 1988-08-17 |
| FR2472862B1 (en) | 1985-02-01 |
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