Multi-stage electrical control system
First Claim
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1. Load control apparatus for controlling a plurality of electrical loads having different predetermined priorities, comprising, in combination:
- electrical load means, includinga first electrical load having a first priority,a second electrical load having a second priority, anda third electrical load having a third priority;
sensing means for sensing the "on" status of the first and second electrical loads and for providing output signals in response thereto; and
disconnect means for disconnecting the electrical loads in response to the output signals of the sensing means, includingfirst disconnect means for disconnecting the second electrical load in response to the sensed "on" status of the first electrical load,second disconnect means for disconnecting the third electrical load in response to the sensed "on" status of the first or second electrical loads,first signal circuitry means for providing an output signal to the first disconnect means in response to the sensed "on" status of the first electrical load,second signal circuitry means for providing an output signal to the second disconnect means in response to the sensed "on" status of the first or second electrical loads; and
isolation means for isolating the first signal circuitry means and the first disconnect means from the second signal circuitry means and the second disconnect means.
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Abstract
Multi-stage electrical load control apparatus includes current transformers for sensing the on and off status of electrical load elements and a predetermined priority system selectively allows different electrical load elements to be turned on and off in response to the sensed load status.
28 Citations
6 Claims
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1. Load control apparatus for controlling a plurality of electrical loads having different predetermined priorities, comprising, in combination:
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electrical load means, including a first electrical load having a first priority, a second electrical load having a second priority, and a third electrical load having a third priority; sensing means for sensing the "on" status of the first and second electrical loads and for providing output signals in response thereto; and disconnect means for disconnecting the electrical loads in response to the output signals of the sensing means, including first disconnect means for disconnecting the second electrical load in response to the sensed "on" status of the first electrical load, second disconnect means for disconnecting the third electrical load in response to the sensed "on" status of the first or second electrical loads, first signal circuitry means for providing an output signal to the first disconnect means in response to the sensed "on" status of the first electrical load, second signal circuitry means for providing an output signal to the second disconnect means in response to the sensed "on" status of the first or second electrical loads; and isolation means for isolating the first signal circuitry means and the first disconnect means from the second signal circuitry means and the second disconnect means. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification