GB2064818A - Monitoring the operation of an industrial installation - Google Patents
Monitoring the operation of an industrial installation Download PDFInfo
- Publication number
- GB2064818A GB2064818A GB8038280A GB8038280A GB2064818A GB 2064818 A GB2064818 A GB 2064818A GB 8038280 A GB8038280 A GB 8038280A GB 8038280 A GB8038280 A GB 8038280A GB 2064818 A GB2064818 A GB 2064818A
- Authority
- GB
- United Kingdom
- Prior art keywords
- installation
- stored
- elements
- memory device
- information
- 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.)
- Granted
Links
- 238000009434 installation Methods 0.000 title claims abstract description 45
- 238000012544 monitoring process Methods 0.000 title claims description 9
- 230000000007 visual effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005242 forging Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
- G07C3/14—Quality control systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Quality & Reliability (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Forging (AREA)
Abstract
Operating parameters of at least some of the elements in the industrial installation, or the parameters of a product produced by the installation, are stored in a memory device. During operation of the installation, information is received by a computer from the installation and is compared with the corresponding stored data. If the comparison indicates that the received information is not within a predetermined relationship of the stored data, then the result of the comparison is displayed on a visual display device.
Description
SPECIFICATION
Monitoring the operation of an industrial installation
This invention relates to a method of, and apparatus for, monitoring the operation of an industrial installation.
In many industrial instaliations, the operating parameters of some of the elements or groups of elements of the installation worsen over a period of time. The variation with time is usually small and very often a small worsening of the parameters is acceptable and has no significant effect on the operation of the installation. However, over a period of time, the worsening of the operating parameters may be such that the operating parameters fall below an acceptable level and there is a significant effect on the operation of the installation. Because the worsening of the parameters takes place slowly, it may be some time before the user of the installation realises that the parameters are below an acceptable level and the installation is operating below its optimum efficiency.
It is an object of the present invention to provide a method of, and apparatus for, monitoring the operation of an industrial installation to try and reduce the disadvantages referred to above.
According to a first aspect of the present invention, in a method of monitoring the operation of an industrial installation, the operating parameters of at least some of the elements or group of elements of the installation, and/or parameters of a product produced by the installation, are stored in a memory device and, during operation of the installation, information received by a computer from sensors associated with said elements or groups of elements, and/or said product, is automatically compared with corresponding information stored in the memory device and the result of the comparison is displayed on a visual display device at least when the comparison indicates that the information received from one or more of the sensors is not within a predetermined relationship range with the corresponding stored parameter.
In the industrial installation, the operating pressure or temperature, for example, of one of the elements forming part of the installation is known and it is stored in the memory device and, during operation of the installation, a sensor associated with that element periodically feds back information concerning the operating pressure or temperature and the computer compares this information fed back by the sensor with the corresponding parameter stored in the memory device and produces a comparison signal. The comparison may be displayed on a visual display device.Alternatively, so long as the result of the comparison is within a predetermined relationship, for example within + 20% of the stored parameter, then no action is taken but, as soon as the comparison indicates that the operating parameter is outside the acceptable range, then the results of the comparison are displayed on the visual display device. An operator can immediately see when this operating parameter is outside of, or moving away from, the acceptable value and can take steps to bring about a suitable correction.
A particular, but not sole, application of the invention is to a forging installation in which a metal ingot is supported by one or more manipulators and is forged in a forging press. The forging manipulators move towards and away from the forging press to manipulate the ingot and, over a period of time, the drive for the manipulator(s) may become less efficient due to say increasing friction and therefore the operational speed of the manipulator slowly reduces. As another example, the speed of operation of the hydraulic cylinders, which are used to raise and lower the forging tool, may slow down due to, say, leakage of hydraulic fluid, so that the time taken to produce one complete forging operation gradually increases thereby reducing the efficiency of the installation.
One of the dimensions of a workpiece produced in the forging installation may vary over a period of time and, since the variation is small, it may be some time before the variation is noticed, by which time some of the workpieces produced in the installation may be unsaleable, or may require a degree of rectification work, since they have one or more parameters which are outside the acceptable tolerances for that dimension.
A second application of the invention is to an extrusion press. In this instance, a metal billet is extruded through a die by the action of a pressing stem. At the end of the extruding operation, it is necessary to retract the pressing stem and carry out an automatic sequence of operations associated with the removal of the discard portion of the old billet and the introduction of a new billet into the container. The time taken by these non-productive operations is known as the Dead-Cycle Time. If the
Dead-Cycle Time gradually increases over a long period, due to degradation of the performance of some of the system elements, the productivity of the press will be correspondingly reduced.By monitoring Dead-Cycle Time and comparing it with a standard established during commissioning (or otherwise), such a loss of productivity, which could otherwise go undetected, will be immediately identified.
In addition, or as an alternative, to this method of continuously monitoring the operation of the installation, one or more parameters of an article produced by the installation can be readily monitored.
For example, in a forging installation, after each forging stroke, a workpiece is programmed to have a particular dimension. This information is stored in the memory device and the parameter can be measured in some way after each operating stroke of the forge. The measured value and the corresponding stored value are compared by the computer and, if the comparison indicates that the required dimension is not within an acceptable tolerance, then this is indicated on the visual display device.
According to a second aspect of the invention, apparatus for carrying out the method described above comprises a plurality of sensors arranged to supply information concerning the operating parameters of elements or groups of elements of an industrial installation and/or parameters of a product produced by the installation, a memory device for receiving and storing preset information concerning said parameters, computer means for comparing the information received from said sensors with corresponding information stored in the memory device and for producing a comparison signal and a visual display device for displaying said comparison signal at least when the information received from one or more of the sensors is not within a predetermined relationship range with the corresponding stored information.
The sensors on a particular element of the installation may be connected to a micro-compressor which in turn has access to the computer.
A further application of the invention is in certain components in an industrial installation. The wear characteristics of certain elements, such as hydraulic pumps, is directly related to the work done by the element as opposed to the time for which the element is in use. In the case of a hydraulic pump
Work done =
f(pump pressure) dt where f is some function to be established empirically or analytically.
By continuously monitoring the pump pressure for the time that the pump is in use and supplying this information to the computer, the computer can calculate the work done by the pump.
Avalue of the work done by the pump before maintenance is obtained from eitherthe pump manufacturer or from experience and is stored in the memory device. The computer periodically compares the calculated value of the work done with the stored value and, when the comparison indicates that maintenance is due, an indication is made so that the maintenance staff can be alerted.
As an alternative way of determining the degree of wear in a pump, the pump can be caused to deliver at rated power into a closed pipe. The pressure in the pipe will increase at a rate which depends upon the leakage in the pump and hence the wear of the pump. The pump is tested in this manner during of the pump. The pump is tested in this manner during commissioning of the installation and a pressure /time plot is stored in the memory. Subsequently, after periods of use, the pump is retested under the same operating conditions and the results compared with the parameters stored in the memory. If the comparison indicates that the wear in the pump has increased above an acceptable level, then this is indicated on the display device.If a plurality of pumps are delivering fluid into a common system, then the overall pressureltime plot of the installation is stored along with a pressure/time plot for each of the pumps. When the examination of the overall system indicates that excess wear has taken place, then the pressure/time plot of each of the pumps is monitored in turn to see which pump or pumps has worn excessively.
In the application of the invention to an extrusion press, the Dead-Cycle Time of the press as a whole is monitored along with the time for operating each of the motions which make up the Dead-Cycle Time. If the overall system indicates that the Dead-Cycle
Time has increased beyond an acceptable level, then each of the motions is monitored in turn to indicate where the unacceptable increase in time has occurred.
When the invention is applied to a forging press, standard parameters for stroke, thickness and the like are stored in the memory device. The striking rate is monitored without metal in the press and this gives a measure of press performance which is repeated at regular intervals. The integrated stroking rate of the press and the ingot manipulator can also be tested in a similar manner with the manipulator gripping a cold ingot.
Claims (8)
1. A method of monitoring the operation of an industrial installation in which the operating parameters of at least some of the elements or group of elements of the installation, and/or parameters of a product produced by the installation, are stored in a memory device and, during operation of the installation, information received by a computer from sensors associated with said elements or group of elements, and/or said product, is automatically compared with corresponding information stored in the memory device and the result of the comparison is displayed on a visual display device at least when the comparison indicates that the information received from one or more of the sensors is not within a predetermined relationship range with the corresponding stored parameter.
2. A method as claimed in claim 1, in which the operating parameters are obtained and stored in the memory device when the installation is commissioned.
3. A method as claimed in claim 1 or 2, in which operating parameters representing the overall operation of a group of elements of the installation and operating parameters representing the operation of each element are stored in the memory device and, during operation of the installation, information received by the computer from sensors associated with the group of elements is automatically compared with the corresponding information stored in the memory device and, if the result of the comparison indicates that the information is not within the predetermined relationship range with the stored parameter, then the computer compares in turn the information received from the sensors associated with each of the elements with the corresponding information stored in the memory device.
4. A method as claimed in claim 1,2 or 3, in which the installation is an extrusion press and the
Dead-Cycle Time of the press is monitored.
5. A method as claimed in claim 3, in which the installation includes a plurality of pumps feeding into a common system.
6. A method as claimed in claim 1, in which information concerning the operating parameters of an element are continuously monitored and from this information the computer calculates the wear of the element, said calculated wear being compared with a value of wear stored in the memory device.
7. Apparatus for carrying out the method claimed in claim 1 and comprising a plurality of sensors arranged to supply information concerning the operating parameters of elements or groups of elements of an industrial installation and/or parameters of a product produced by the installation, a memory device for receiving and storing preset information concerning said parameters, computer means for automatically comparing the information received from said sensors with corresponding information stored in the memory device and for producing a comparison signal and a visual display device for displaying said comparison at least when the information received from one or more of the sensors is not within a predetermined relationship range with the corresponding stored information.
8. Apparatus as claimed in claim 7, in which said sensors serve to monitor the operating pressure of pumps in an installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8038280A GB2064818B (en) | 1979-11-30 | 1980-11-28 | Monitoring the operation of an industrial installation |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7941407 | 1979-11-30 | ||
| GB8038280A GB2064818B (en) | 1979-11-30 | 1980-11-28 | Monitoring the operation of an industrial installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2064818A true GB2064818A (en) | 1981-06-17 |
| GB2064818B GB2064818B (en) | 1983-11-23 |
Family
ID=26273742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8038280A Expired GB2064818B (en) | 1979-11-30 | 1980-11-28 | Monitoring the operation of an industrial installation |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2064818B (en) |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127122A (en) * | 1982-09-20 | 1984-04-04 | Mac Lean Fogg Co | Fastener assembly for clamped wheels |
| EP0088591A3 (en) * | 1982-03-06 | 1985-10-09 | Plessey Overseas Limited | On board memory for multi component manufacturing products |
| WO1986003281A1 (en) * | 1983-06-02 | 1986-06-05 | Enstroem Henrik Sven | Method primarily for performance control at heat pumps or refrigerating installations and arrangement for carrying out the method |
| EP0319762A1 (en) * | 1987-12-10 | 1989-06-14 | Richard Wolf GmbH | Means for monitoring the operations of supply devices for endoscopes |
| EP0237288A3 (en) * | 1986-03-07 | 1989-08-30 | Celanese Corporation | Diagnostic and control system for cigarette filter rod making machine |
| EP0453302A1 (en) * | 1990-04-19 | 1991-10-23 | Whitbread Plc | Refrigeration circuit including diagnostic equipment |
| GB2364807A (en) * | 2000-02-12 | 2002-02-06 | Sennheiser Electronic | Installation monitoring system |
| US8065886B2 (en) | 2001-05-03 | 2011-11-29 | Emerson Retail Services, Inc. | Refrigeration system energy monitoring and diagnostics |
| 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 |
| 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 |
| US9121407B2 (en) | 2004-04-27 | 2015-09-01 | Emerson Climate Technologies, Inc. | Compressor diagnostic and protection system and method |
| 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 |
| US9551504B2 (en) | 2013-03-15 | 2017-01-24 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US9638436B2 (en) | 2013-03-15 | 2017-05-02 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US9765979B2 (en) | 2013-04-05 | 2017-09-19 | Emerson Climate Technologies, Inc. | Heat-pump system with refrigerant charge diagnostics |
| US9803902B2 (en) | 2013-03-15 | 2017-10-31 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification using two condenser coil temperatures |
| US9823632B2 (en) | 2006-09-07 | 2017-11-21 | Emerson Climate Technologies, Inc. | Compressor data module |
| US9885507B2 (en) | 2006-07-19 | 2018-02-06 | Emerson Climate Technologies, Inc. | Protection and diagnostic module for a refrigeration system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022049A2 (en) | 2003-08-25 | 2005-03-10 | Computer Process Controls, Inc. | Refrigeration control system |
| WO2006091521A2 (en) | 2005-02-21 | 2006-08-31 | Computer Process Controls, Inc. | Enterprise control and monitoring system |
| US7752853B2 (en) | 2005-10-21 | 2010-07-13 | Emerson Retail Services, Inc. | Monitoring refrigerant in a refrigeration system |
| US7665315B2 (en) | 2005-10-21 | 2010-02-23 | Emerson Retail Services, Inc. | Proofing a refrigeration system operating state |
| US7596959B2 (en) | 2005-10-21 | 2009-10-06 | Emerson Retail Services, Inc. | Monitoring compressor performance in a refrigeration system |
| US7752854B2 (en) | 2005-10-21 | 2010-07-13 | Emerson Retail Services, Inc. | Monitoring a condenser in a refrigeration system |
| US7594407B2 (en) | 2005-10-21 | 2009-09-29 | Emerson Climate Technologies, Inc. | Monitoring refrigerant in a refrigeration system |
-
1980
- 1980-11-28 GB GB8038280A patent/GB2064818B/en not_active Expired
Cited By (54)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0088591A3 (en) * | 1982-03-06 | 1985-10-09 | Plessey Overseas Limited | On board memory for multi component manufacturing products |
| GB2127122A (en) * | 1982-09-20 | 1984-04-04 | Mac Lean Fogg Co | Fastener assembly for clamped wheels |
| WO1986003281A1 (en) * | 1983-06-02 | 1986-06-05 | Enstroem Henrik Sven | Method primarily for performance control at heat pumps or refrigerating installations and arrangement for carrying out the method |
| US4611470A (en) * | 1983-06-02 | 1986-09-16 | Enstroem Henrik S | Method primarily for performance control at heat pumps or refrigerating installations and arrangement for carrying out the method |
| EP0237288A3 (en) * | 1986-03-07 | 1989-08-30 | Celanese Corporation | Diagnostic and control system for cigarette filter rod making machine |
| EP0319762A1 (en) * | 1987-12-10 | 1989-06-14 | Richard Wolf GmbH | Means for monitoring the operations of supply devices for endoscopes |
| EP0453302A1 (en) * | 1990-04-19 | 1991-10-23 | Whitbread Plc | Refrigeration circuit including diagnostic equipment |
| GB2364807B (en) * | 2000-02-12 | 2003-11-05 | Sennheiser Electronic | Installation monitoring system |
| GB2364807A (en) * | 2000-02-12 | 2002-02-06 | Sennheiser Electronic | Installation monitoring system |
| US8065886B2 (en) | 2001-05-03 | 2011-11-29 | Emerson Retail Services, Inc. | Refrigeration system energy 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 |
| US8700444B2 (en) | 2002-10-31 | 2014-04-15 | Emerson Retail Services Inc. | System for monitoring optimal equipment operating parameters |
| US9669498B2 (en) | 2004-04-27 | 2017-06-06 | Emerson Climate Technologies, Inc. | Compressor diagnostic and protection system and method |
| US9121407B2 (en) | 2004-04-27 | 2015-09-01 | 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 |
| US9081394B2 (en) | 2004-08-11 | 2015-07-14 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring a refrigeration-cycle system |
| US9304521B2 (en) | 2004-08-11 | 2016-04-05 | Emerson Climate Technologies, Inc. | Air filter monitoring system |
| US9021819B2 (en) | 2004-08-11 | 2015-05-05 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring a refrigeration-cycle system |
| US9023136B2 (en) | 2004-08-11 | 2015-05-05 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring a refrigeration-cycle system |
| US9046900B2 (en) | 2004-08-11 | 2015-06-02 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring refrigeration-cycle systems |
| US8974573B2 (en) | 2004-08-11 | 2015-03-10 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring a refrigeration-cycle system |
| US9086704B2 (en) | 2004-08-11 | 2015-07-21 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring a refrigeration-cycle system |
| US9690307B2 (en) | 2004-08-11 | 2017-06-27 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring refrigeration-cycle systems |
| US10558229B2 (en) | 2004-08-11 | 2020-02-11 | Emerson Climate Technologies Inc. | Method and apparatus for monitoring refrigeration-cycle systems |
| US9017461B2 (en) | 2004-08-11 | 2015-04-28 | Emerson Climate Technologies, Inc. | Method and apparatus for monitoring a refrigeration-cycle system |
| US9885507B2 (en) | 2006-07-19 | 2018-02-06 | Emerson Climate Technologies, Inc. | Protection and diagnostic module for a refrigeration system |
| US9823632B2 (en) | 2006-09-07 | 2017-11-21 | Emerson Climate Technologies, Inc. | Compressor data module |
| US9310094B2 (en) | 2007-07-30 | 2016-04-12 | Emerson Climate Technologies, Inc. | Portable method and apparatus for monitoring refrigerant-cycle systems |
| US10352602B2 (en) | 2007-07-30 | 2019-07-16 | Emerson Climate Technologies, Inc. | Portable method and apparatus for monitoring refrigerant-cycle systems |
| US9194894B2 (en) | 2007-11-02 | 2015-11-24 | Emerson Climate Technologies, Inc. | Compressor sensor module |
| US10458404B2 (en) | 2007-11-02 | 2019-10-29 | Emerson Climate Technologies, Inc. | Compressor sensor module |
| US9140728B2 (en) | 2007-11-02 | 2015-09-22 | Emerson Climate Technologies, Inc. | Compressor sensor module |
| 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 |
| US9395711B2 (en) | 2009-05-29 | 2016-07-19 | Emerson Climate Technologies Retail Solutions, Inc. | System and method for monitoring and evaluating equipment operating parameter modifications |
| US8761908B2 (en) | 2009-05-29 | 2014-06-24 | Emerson Climate Technologies Retail Solutions, Inc. | System and method for monitoring and evaluating equipment operating parameter modifications |
| US9285802B2 (en) | 2011-02-28 | 2016-03-15 | Emerson Electric Co. | Residential solutions HVAC monitoring and diagnosis |
| US10884403B2 (en) | 2011-02-28 | 2021-01-05 | Emerson Electric Co. | Remote HVAC monitoring and diagnosis |
| US9703287B2 (en) | 2011-02-28 | 2017-07-11 | Emerson Electric Co. | Remote HVAC monitoring and diagnosis |
| US10234854B2 (en) | 2011-02-28 | 2019-03-19 | Emerson Electric Co. | Remote HVAC monitoring and diagnosis |
| US9876346B2 (en) | 2012-01-11 | 2018-01-23 | Emerson Climate Technologies, Inc. | System and method for compressor motor protection |
| US8964338B2 (en) | 2012-01-11 | 2015-02-24 | Emerson Climate Technologies, Inc. | System and method for compressor motor protection |
| US9590413B2 (en) | 2012-01-11 | 2017-03-07 | Emerson Climate Technologies, Inc. | System and method for compressor motor protection |
| US9310439B2 (en) | 2012-09-25 | 2016-04-12 | Emerson Climate Technologies, Inc. | Compressor having a control and diagnostic module |
| US9762168B2 (en) | 2012-09-25 | 2017-09-12 | Emerson Climate Technologies, Inc. | Compressor having a control and diagnostic module |
| US10488090B2 (en) | 2013-03-15 | 2019-11-26 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification |
| US10274945B2 (en) | 2013-03-15 | 2019-04-30 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US9551504B2 (en) | 2013-03-15 | 2017-01-24 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US9638436B2 (en) | 2013-03-15 | 2017-05-02 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
| US10775084B2 (en) | 2013-03-15 | 2020-09-15 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification |
| US9803902B2 (en) | 2013-03-15 | 2017-10-31 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification using two condenser coil temperatures |
| US9765979B2 (en) | 2013-04-05 | 2017-09-19 | Emerson Climate Technologies, Inc. | Heat-pump system with refrigerant charge diagnostics |
| US10443863B2 (en) | 2013-04-05 | 2019-10-15 | Emerson Climate Technologies, Inc. | Method of monitoring charge condition of heat pump system |
| US10060636B2 (en) | 2013-04-05 | 2018-08-28 | Emerson Climate Technologies, Inc. | Heat pump system with refrigerant charge diagnostics |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2064818B (en) | 1983-11-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |