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AssigneeKriwan Industrie-Elektronik GmbH
InventorsChristian Ellwein, Xiaoming Peng, Christian Grub
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A method for protecting a nonmobile work machine driven by an electric motor includes determining, via a measuring unit, at least one measured value of a time-critical parameter of the work machine. The work machine is switched off when the determined measured value of the time-critical parameter is outside a predefined setpoint range. The determined measured value of the time-critical parameter is quantized in a level signal and transmitted as a first signal to an evaluation unit via an interface, and a second signal for further information concerning the work machine, to be transmitted from the measuring unit to the evaluation unit, is modulated to the first signal.
A method for protecting a nonmobile work machine driven by an electric motor, at least one measured value of a time-critical parameter of the work machine being determined via a measuring unit, the work machine being switched off when the determined measured value of the time-critical parameter is outside a predefined setpoint range, and the determined measured value of the time-critical parameter being quantized in a level signal (i1, i2, i3, i4) and transmitted as a first signal to an evaluation unit via an interface, wherein a second signal for further information concerning the work machine, to be transmitted from the measuring unit to the evaluation unit, is modulated to the first signal at an amplitude that is smaller than the smallest difference between all provided levels of the first signal.
A method for protecting a nonmobile work machine driven by an electric motor, at least one measured value of a time-critical parameter of the work machine being determined via a measuring unit, the work machine being switched off when the determined measured value of the time-critical parameter is outside a predefined setpoint range, and the determined measured value of the time-critical parameter being quantized in a level signal (i1, i2, i3, i4) and transmitted as a first signal to an evaluation unit via an interface, wherein a second signal for further information concerning the work machine, to be transmitted from the measuring unit to the evaluation unit, is modulated to the first signal wherein the second signal is a digital data signal having a defined data transmission rate and wherein the second signal is modulated by pulse width modulation, wherein the digital data signal of the second signal is made up of two different pulse widths of the positive pulse, of the negative pulse, or both.
A nonmobile work machine driven by an electric motor, and having a protective device that includes at least one measuring unit and one evaluation unit, which are connected to one another for transmitting information via an interface, a first signal to be transmitted from the measuring unit to the evaluation unit being designed as a level signal, and the evaluation unit being connected to a switch-off device for switching off the work machine as a function of the first signal wherein a second signal to be transmitted from the measuring unit to the evaluation unit is modulated to the first signal at an amplitude that is smaller than the smallest difference between all provided levels of the first signal.
A nonmobile work machine driven by an electric motor, and having a protective device that includes at least one measuring unit and one evaluation unit, which are connected to one another for transmitting information via an interface, a first signal to be transmitted from the measuring unit to the evaluation unit being designed as a level signal, and the evaluation unit being connected to a switch-off device for switching off the work machine as a function of the first signal wherein a second signal to be transmitted from the measuring unit to the evaluation unit is modulated to the first signal by pulse width modulation, wherein the digital data signal of the second signal is made up of two different pulse widths of the positive pulse, of the negative pulse, or both.
Dependencies are inferred from the claim text.