Abstract: A motor drive configured to be connected to an external device is provided. The motor drive includes an outer housing, a power module housed within the outer housing, and a control module housed within the outer housing and in communication with the power module. The motor drive also includes a communications port disposed on the outer housing and in communication with the control module. The communications port supports dual-role power in which the motor drive powers the external device when the external device is of a first type and the motor drive receives power from the external device when the external device is of a second type.

Abstract: A tamper detection apparatus includes a switch and a tamper detection circuit with a non-volatile memory in an industrial product enclosure. In response to the switch detecting a door or panel of an industrial product enclosure being open when an electronic component or system in the enclosure is unpowered, the tamper detection circuit stores a tamper event code in the non-volatile memory. After the electronic component or system is powered, a system processor obtains the tamper event code from the tamper detection circuit and refrains from operating a machine or process pending reset of the industrial product by a user.

Abstract: Control circuitry of a motor drive provides commands for operation of power circuitry in cooperation with peripheral circuits and devices, such as converters, inverters, feedback precharge circuits, feedback devices, interfaces, and so forth. The communications with the devices is handled by fiber optic communications circuitry that implements a flexible scheme of dynamic interval communication depending upon the capabilities and design of the peripheral circuit or device. The communication may be in accordance with a plurality of predetermined schemes, each having different data transfer rates, data allocations, and so forth. The schemes may each set communications protocols (e.g., timing) over a high speed interface between the fiber optic communications circuitry on one side and over fiber optic cables to the peripherals on another side.

Abstract: A tamper detection apparatus includes a switch and a tamper detection circuit with a non-volatile memory in an industrial product enclosure. In response to the switch detecting a door or panel of an industrial product enclosure being open when an electronic component or system in the enclosure is unpowered, the tamper detection circuit stores a tamper event code in the non-volatile memory. After the electronic component or system is powered, a system processor obtains the tamper event code from the tamper detection circuit and refrains from operating a machine or process pending reset of the industrial product by a user.

Abstract: Disclosed examples provide control boards with power systems that include a safety system with a protection circuit to selectively connect or disconnect first and second DC to DC converters to or from a DC input signal according to the DC input signal and a monitor signal, and a monitor circuit to provide the monitor signal according to the first and second DC to DC converter output signals.

Abstract: Control circuitry of a motor drive provides commands for operation of power circuitry in cooperation with peripheral circuits and devices, such as converters, inverters, feedback precharge circuits, feedback devices, interfaces, and so forth. The communications with the devices is handled by fiber optic communications circuitry that implements a flexible scheme of dynamic interval communication depending upon the capabilities and design of the peripheral circuit or device. The communication may be in accordance with a plurality of predetermined schemes, each having different data transfer rates, data allocations, and so forth. The schemes may each set communications protocols (e.g., timing) over a high speed interface between the fiber optic communications circuitry on one side and over fiber optic cables to the peripherals on another side.

Abstract: Parallel converter current imbalance control apparatus and methods in which individual converter AC currents are measured for each phase, and the AC voltage control modulation indices associated with the converters having the highest and lowest AC currents for a given phase are adjusted to counteract current imbalance between the converters.

Abstract: A motor starter includes a contactor and an overload relay. The overload relay includes a power supply having a voltage, a processor powered by the power supply voltage and being structured to control the contactor, and an overvoltage circuit. The overvoltage circuit includes a voltage reference having a voltage, a comparator, a load and a switch. The comparator includes a first input for the power supply voltage, the first input cooperating with the voltage of the voltage reference to determine a threshold voltage, a second input for voltage reference voltage, and an output. The switch is controlled by the comparator output and is structured to electrically connect the power supply voltage to ground through the load whenever the power supply voltage exceeds the threshold voltage.

Abstract: A method for broadcasting data on a peripheral component interconnect bus includes coupling at least one master agent, at least one responding target agent and at least one snooping target agent to the peripheral component interconnect bus, transmitting a standard PCI master agent signal from the master agent to the responding target agent, transmitting a standard PCI responding target agent signal, driven by the responding target agent, from the responding target agent to the master agent and monitoring the standard PCI master agent signal and the standard PCI responding target agent signal using the snooping target agent.

Abstract: An apparatus and method for controlling the operation of (HVAC) equipment or other climate control equipment. The method is executed by a conventional computer with a memory storing a program. The system determines whether the space is not occupied and if the temperature drifts outside an allowed margin, then the system allows the temperature to drift to a maximum allowable margin, or to a newly determined margin, whichever is less. The newly determined margin is based upon a determination of the maximum temperature margin to which the system can drift and still drive the temperature back substantially to the use set point within a predetermined maximum recovery time. The recovery time is calculated based upon past temperature-vs.-time data stored for previous cycles of drift and drive.