Abstract: A method is disclosed for modifying the physical characteristics of a web which involves passing the web between at least one pair of interengaged rolls to incrementally stretch the web, and then withdrawing the incrementally stretched web from between the rolls under tension. A web modified according to the disclosed method has desirable breathability and liquid impermeability, as well as extensibility and a soft, cloth-like textured surface.

Abstract: A backflow prevention assembly for global use with dispensers requiring a variety of backflow prevention devices based on regulatory standards is provided. The assembly includes a housing comprising first and second housing members and including quick connector attachments extending therefrom. The quick connector attachments are non-threaded members configured to be attached to the various measurement and types of connections found throughout the world. A cover is provided for venting purposes to reduce the backflow siphoning forces or pressure, which causes the backflow of a product chemistry. Furthermore, a backflow prevention device is configured to be fluidly coupled to the housing of the present invention to provide for one way flow and the prevention of backflow of a product chemistry into a water supply. The flow control may be selected based on the regulatory standards of the location used.

Abstract: Diagnostic and/or control methods, systems and apparatuses for variable frequency drives are disclosed. The variable frequency drive may be controlled by a controller that may conduct one or more tests or evaluations. The tests or evaluations may include determining whether a switching device in the variable frequency drive is open-circuited, short-circuited, or operating normally. The tests may include determining whether current provided at an inverter output of the variable frequency drive is within a predetermined range. An exemplary embodiment evaluates the drive for a short circuit condition, an open circuit condition, and a sensor error or failure condition, controls operation of the drive based upon these one or more evaluations, may abort operation of the drive based upon one or more evaluations, and may set a fault code indicative of the type of error encountered.

Abstract: Unique apparatuses, methods, and systems of opposing, limiting, and/or preventing undesired or un-commanded compressor rotation are disclosed. One exemplary embodiment is an HVACR system comprising a variable frequency drive configured to drive an electric motor to rotate a screw compressor or scroll compressor. A controller is configured to monitor various aspects of the system and to control the drive. When a condition indicative of potential undesired or un-commanded compressor rotation is identified, the controller commands the variable frequency drive to control the motor to limit and preferably prevent compressor rotation. One technique comprises shorting switches of the drive to a DC bus rail to allow back EMF induced current in the motor windings to be dissipated through winding resistance thus providing a damping force. Another technique comprises controlling the inverter to insert a DC current into the motor to cause the motor to align to and hold a particular position.

Abstract: Variable frequency drive active harmonic mitigation controls and diagnostics are disclosed. Exemplary controls and diagnostics include operating a variable frequency drive including converting an AC input line voltage to a DC voltage, generating a motor drive signal using the DC voltage, and driving an electric motor with the motor drive signal. A harmonic mitigation signal is provided to the drive configured to at least partially mitigate harmonics during the operation of the drive. The harmonic mitigation signal is inhibited based upon presence of an error condition associated with the drive input. The inhibiting is terminated based upon the absence of the error condition. A diagnostic fault condition based upon a number of occurrences of the error condition.

Abstract: Operation of a variable frequency in a manner configured to avoid overheating is provided. In one form, a method includes providing a variable frequency drive that includes a switching device in thermal communication with a heat sink including a thermal mass. The method further includes operating the drive in a first mode before active cooling of the heat sink is established and a second mode following the first mode. Operation of the drive in the first mode includes operating the switching device in a first switching frequency mode, and the first switching frequency mode and the thermal mass of the heat sink are selected to provide a temperature of the switching device below a predetermined threshold before active cooling of the heat sink is established. Further embodiments, forms, features, and aspects shall become apparent from the description and drawings.

Abstract: Overvoltage protection apparatuses, systems and methods for variable frequency motor drives are disclosed. In an exemplary embodiment, a variable frequency motor drive system including a rectifier, a DC bus electrically coupled with the rectifier, and an inverter electrically coupled with the DC bus is provided. A protection device electrically coupled with the rectifier and configured to interrupt power supply to the system based upon fault conditions is provided. A controller is provided and configured to receive information indicative of a voltage of the DC bus, process the received information to model a condition of at least one component of the variable frequency motor drive, and control the protection device to interrupt power supply to the variable frequency motor drive if the modeled condition meets a fault criterion.

Abstract: An exemplary inverter includes first, second and third legs connected in parallel to a line rail and a neutral rail. Each leg includes a first switch, a second switch, and a node between the first and second switches. The first leg further includes a voltage boosting section operable to selectively increase and decrease the voltage potential of the node of the first leg. The voltage boosting section may include a capacitor in parallel with the first and second switches. The first leg may further include a third switch in series with the voltage boosting section and between the voltage boosting section and the line rail, and a fourth switch in series with the voltage boosting section and between the voltage boosting section and the neutral rail.

Abstract: A backflow prevention assembly for global use with dispensers requiring a variety of backflow prevention devices based on regulatory standards is provided. The assembly includes a housing comprising first and second housing members and including quick connector attachments extending therefrom. The quick connector attachments are non-threaded members configured to be attached to the various measurement and types of connections found throughout the world. A cover is provided for venting purposes to reduce the backflow siphoning forces or pressure, which causes the backflow of a product chemistry. Furthermore, a backflow prevention device is configured to be fluidly coupled to the housing of the present invention to provide for one way flow and the prevention of backflow of a product chemistry into a water supply. The flow control may be selected based on the regulatory standards of the location used.

Abstract: A controller is configured to generate control signals to control a variable frequency drive coupled with a load. A simulator receives the control signals and processes the control signals. The simulator simulates a variable frequency drive and a load by generating feedback signals based on a model and the control signals. The controller receives the feedback signals from the simulator.

Abstract: Systems and methods are used to control operation of a rotary compressor of a refrigeration system to limit or prevent movement of rotors due to axial thrust loading resulting from rapid changes in speed of the rotors of the compressor. The operational profile of the motor is controlled to maintain acceleration torque and deceleration torque within predefined limits. The acceleration torque and deceleration torque are maintained within the predefined limits by controlling the speed of the motor, or by controlling the torque applied by the motor to the rotors during acceleration or deceleration.

Abstract: A service station for use with a printer includes a spittoon. The service station includes a shuttle movable along a shuttle axis, and a spittoon plow supported by the shuttle. The spittoon plow includes at least one blade portion that is angled to spread the service ink along both a width and a length of the spittoon.

Abstract: A method of maintaining nozzles of a printhead includes periodically moving a printhead having a plurality of nozzles toward a spittoon, and ejecting a plurality of sets of ink drops from the nozzles of the printhead to the spittoon mode. The method also includes controlling the ejecting of the plurality of sets of ink drops from the nozzles of the printhead to the spittoon by the control module. Consecutive sets of ink drops received by the spittoon are received by different sets of regions of the plurality of sets of regions within the spittoon.

Abstract: An exemplary inverter includes first, second and third legs connected in parallel to a line rail and a neutral rail. Each leg includes a first switch, a second switch, and a node between the first and second switches. The first leg further includes a voltage boosting section operable to selectively increase and decrease the voltage potential of the node of the first leg. The voltage boosting section may include a capacitor in parallel with the first and second switches. The first leg may further include a third switch in series with the voltage boosting section and between the voltage boosting section and the line rail, and a fourth switch in series with the voltage boosting section and between the voltage boosting section and the neutral rail.

Abstract: A distributed antenna system and related methods are provided to reduce interference among wireless mobile devices in a distributed antenna system. A combiner is provided that is configured to be coupled to a plurality of remote transceiver stations deployed in a coverage area and which wirelessly transmit downlink signals to and receive uplink signals from wireless mobile devices. A plurality of input streams that carry uplink signals transmitted by wireless mobile devices are received on individually assigned signal paths from each of the remote transceiver stations. At least one parameter of an input stream received from the one or more of the remote transceiver stations is monitored. A mapping function is determined based on the monitoring. The plurality of input streams are combined based on the mapping function to produce the two or more output streams and the two or more output streams are sent to corresponding receivers in a base station.

Abstract: A method is disclosed for modifying the physical characteristics of a web which involves passing the web between at least one pair of interengaged rolls to incrementally stretch the web, and then withdrawing the incrementally stretched web from between the rolls under tension. A web modified according to the disclosed method has desirable breathability and liquid impermeability, as well as extensibility and a soft, cloth-like textured surface.

Abstract: A method is disclosed for modifying the physical characteristics of a web which involves passing the web between at least one pair of interengaged rolls to incrementally stretch the web, and then withdrawing the incrementally stretched web from between the rolls under tension. A web modified according to the disclosed method has desirable breathability and liquid impermeability, as well as extensibility and a soft, cloth-like textured surface.

Abstract: A method for producing a stretch laminate includes forming an intermediate stretch laminate. Forming the intermediate stretch laminate includes providing a first substrate and attaching an elastic film to a surface of the first substrate via an adhesive. The first substrate and the elastic film are in a face to face orientation. The intermediate stretch laminate has a residual energy of greater than or equal to 50% at a predetermined applied strain. The method of forming the stretch laminate further includes mechanically activating the intermediate stretch laminate at a strain rate of at least 100 s?1.

Abstract: A distributed antenna system and related methods are provided to reduce interference among wireless mobile devices in a distributed antenna system. A combiner is provided that is configured to be coupled to a plurality of remote transceiver stations deployed in a coverage area and which wirelessly transmit downlink signals to and receive uplink signals from wireless mobile devices. A plurality of input streams that carry uplink signals transmitted by wireless mobile devices are received on individually assigned signal paths from each of the remote transceiver stations. At least one parameter of an input stream received from the one or more of the remote transceiver stations is monitored. A mapping function is determined based on the monitoring. The plurality of input streams are combined based on the mapping function to produce the two or more output streams and the two or more output streams are sent to corresponding receivers in a base station.

Abstract: A method is disclosed for modifying the physical characteristics of a web which involves passing the web between at least one pair of interengaged rolls to incrementally stretch the web, and then withdrawing the incrementally stretched web from between the rolls under tension. A web modified according to the disclosed method has desirable breathability and liquid impermeability, as well as extensibility and a soft, cloth-like textured surface.