A method for detecting a blocked valve of a coolant compressor including a drive unit and a piston-cylinder unit for cyclical compression of a coolant, wherein the drive unit has an electric motor for driving the piston-cylinder unit, monitors the speed () of the electric motor. A maximum speed (.sub.max) of the electric motor is initially detected, and the following steps are carried out, as long as the speed () of the electric motor substantially corresponds to the maximum speed (.sub.max): determining a maximum value X.sub.max of a monitoring parameter (I, T) of the coolant compressor (1); determining a value X.sub.t1 of the monitoring parameter (I, T) after a first time period (t1) after determining the maximum value X.sub.max; detecting a blocked valve if X.sub.t1 is less than X.sub.max and (X.sub.maxX.sub.t1)/X.sub.max.sub.X applies, wherein .sub.X is predetermined.

A pumping system featuring a pump, motor, a bearing assembly, integrated data acquisition system and combined programmable logic controller (PLC), data acquisition and modem. The pump couples to a pump shaft that responds to a pump shaft force to pump a liquid. The motor couples to the pump shaft, responds to VFD/VSD control signaling and provides the pump shaft force to drive the pump shaft. The bearing assembly includes a bearing with the pump shaft arranged therein and couples the pump and the motor. The variable frequency/speed drive (VFD/VSD) receives PLC control signaling and provides the VFD/VSD control signaling to drive the motor. The integrated data acquisition system responds to PLC data acquisition signaling, and provides integrated data acquisition system signaling containing information about an integrated set of pumping system parameters related to the pump, the bearing assembly, the motor and the VFD/VSD in the pump system. The combined programmable logic controller (PLC), data acquisition and modem provides the PLC data acquisition signaling and receive the integrated data acquisition signaling, provides PLC data acquisition modem signaling that exports performance data to the Internet to allow remote manual monitoring of the pump system, and provides the PLC control signaling to control the VFD/VSD and operate the pumping system as a controlled, closed loop system.

An information collection system for a pump for removing fluid collected by a buildings drainage system from subterranean locations adjacent a building is provided. The system includes a sensor for sensing operation information regarding the operation of the pump and an information collection device operably connected to the sensor and adapted to receive the operation information. The system also includes an information storage device operably connected to the information collection device and adapted to store the operation information. The system further includes a retrieval device operably connected to the storage device and adapted to retrieve the operation information.

A motor pump unit for a high-pressure cleaning appliance is provided, in which the cleaning liquid conveyed by the pump assembly is used for cooling the motor, comprising a motor housing which surrounds the motor, and a cooling channel which surrounds the motor and through which the cleaning liquid can flow for heat dissipation. To provide a motor pump unit having a level of electrical safety which is higher than that of a conventional motor pump unit, the cooling channel surround the motor housing, and the motor pump unit comprise at least one thermally conductive spacer element by way of which the cooling channel is spaced from the motor housing. A high-pressure cleaning appliance is also provided.

An integrated system and method are provided in an electrically powered airless paint spray unit for thermally monitoring the heat generating elements of the spray unit and provide thermal protection for the spray unit and the monitored heat generating elements. The temperatures of various heat generating elements of the paint spray unit are measured and directed to the motor controller of the electric motor of the unit the microprocessor of which is programmed to adjust the power level to the motor in response to excessive temperature readings of the monitored elements or shut off power to the motor in the event any of the temperature readings are greater than a maximum temperature assigned to the monitored element.

A motor-driven compressor includes an electric motor, a drive circuit, a modulation method controller, a temperature measuring section, a high-temperature (HT) stop controller, and a high-temperature (HT) stop temperature setting section. The high-temperature (HT) stop controller stops the electric motor when the temperature measured by the temperature measuring section is higher than or equal to a predetermined high-temperature (HT) stop temperature. When the modulation method is the three-phase modulation, the HT stop temperature setting section sets the HT stop temperature to a three-phase high-temperature (HT) stop temperature. When the modulation method is the two-phase modulation, the HT stop temperature setting section sets the HT stop temperature to a two-phase high-temperature (HT) stop temperature, which is higher than the three-phase HT stop temperature.

An integrated system and method are provided in an electrically powered airless paint spray unit for thermally monitoring the heat generating elements of the spray unit and provide thermal protection for the spray unit and the monitored heat generating elements. The temperatures of various heat generating elements of the paint spray unit are measured and directed to the motor controller of the electric motor of the unit the microprocessor of which is programmed to adjust the power level to the motor in response to excessive temperature readings of the monitored elements or shut off power to the motor in the event any of the temperature readings are greater than a maximum temperature assigned to the monitored element.

This electric compressor includes a compressor which rotates around an axis to compress a fluid, a motor which rotatably drives the compressor around the axis, and a control unit having a first component and a second component and controlling current supply to the motor during driving using the first component and the second component. An allowable current when the first component and the second component are exposed to the same temperature is set to be smaller in the second component than in the first component. The second component is disposed at a place in which cooling capability is greater than that of the first component so that allowable power of the second component at rated use is set to be greater than an allowable power of the first component. This electric compressor includes a temperature sensor which detects the temperature of the first component and a calculation unit which outputs an alarm signal when the temperature detected by the temperature sensor and a current flowing in the first component satisfy a predetermined condition.

A refrigerant compressor includes an electric motor. A current sensor measures current to the electric motor. A switching device is configured to close and open to allow and prevent current flow to the electric motor, respectively. A maximum continuous current (MCC) device generates an output that one of: (i) is an MCC for the electric motor and (ii) is a value indicative of the MCC for the electric motor. A motor protection module: is remote from the MCC device; receives the output wirelessly from the MCC device via an antenna; one of sets a first MCC to the MCC for the electric motor and determines the first MCC based on the value indicative of the MCC for the electric motor; selectively sets a predetermined MCC to the first MCC; and controls the switching device based on a comparison of the current to the electric motor and the predetermined MCC.

An air compressor apparatus for a vehicle configured for appropriately maintaining an internal temperature and a discharge temperature thereof even in a cold environment, and a method for controlling a temperature of the same, includes a compressor body driven by a first motor; a support bracket supporting the compressor body and configured to be coupled to the vehicle; and a heat exchanger provided on one side of the support bracket, and configured for raising a temperature of external air to generate heated air and provide the heated air to the compressor body.