Abstract: In a closed loop control system for monitoring and regulating the rate of electrical power delivered to a plurality of electrical loads, an improved circuit is disclosed that is responsive to an analog input signal representing a measured power rate and has a digital pulse output for conditioning a digital switching circuit to add one or more loads when the measured power rate falls below a predetermined rate and to shed one or more loads when the measured power rate exceeds such predetermined rate. The analog input signal is compared with a reference signal to produce an analog error signal that is first compensated for certain types of power rate deviations and is then fed to an analog to digital conversion circuit which includes a threshold detection circuit and a pulse generator circuit and produces one or more output pulses in response to a predetermined threshold magnitude of the compensated error signal.

Abstract: In an electrical load control system, method and apparatus are provided for selectively, individually connecting and disconnecting a plurality of loads to and from a power source. The loads are selectively connected (added), disconnected (shed), and reconnected (restored or added), in a predetermined sequence, wherein the ranking of the loads in such sequence is selectively rotated in a manner which results in a sharing of on and off time and an equalizing of wear among all of the loads. As an example of this operation, a load control system is disclosed in which the consumption of electrical power is varied by periodically shedding and adding individual loads in order to maintain the level of power usage below predetermined limits and yet make full use of the available power within such limits.

Abstract: An electrical circuit for a heating system has a plurality of electrical resistance heating elements and a blower all controlled by a plurality of electro-thermally actuated relays. The circuit is arranged so that the heating elements are sequentially energized and de-energized and so that the blower is maintained in operation at all times that any one of the heating elements is energized. A thermostat controls the operation of the relays, the second and the last of which each having switches connected in series circuits with the actuator of the first relay and in parallel with the thermostat so as to maintain blower operation, which is controlled by the first relay, when the thermostat opens.

Abstract: Apparatus for providing a percentage time control for the manageable and controllable electrical loads in the home such as air conditioning units, hot water heaters, space heaters and like devices, such apparatus including a master timer or programmer which is connected with the said devices so as to automatically predetermine the time periods of operation thereof in a manner such that a considerable saving in the consumption of electrical energy may be effected by periodically deenergizing the units in a selective manner. The arrangement is also such that the automatic "On-Off" periods of operation of the controlled devices may be readily varied or even interrupted in order to be adaptable to different conditions encountered in the home.

Abstract: A battery charging system includes a circuit for sequentially connecting each of a plurality of banks of batteries to a constant current generator for a first predetermined period of time, for example, one hour, and then disconnecting all banks for a second predetermined period of time, for example, fifteen days. A plurality of controlled switching devices are sequentially gated to connect sequentially the banks of batteries, each for the first predetermined period of time, between the output terminals of a constant current generator. For n battery loads, the controlled rectifiers are gated by n outputs of a counter/decoder circuit having n + 1 outputs. The counter/decoder circuit is operated by clock pulse signals supplied thereto by a counter/time base circuit.

Abstract: A sequence control circuit makes use of a stepping switch to progress the steps of an automatically controlled apparatus. The switch steps as limit switches operate to conclude each stage of the sequence and proving switches, in series with the limit switches, operate to complete sub-circuits and prove the state of the circuit as satisfactory.

Abstract: Apparatus for distributing power from a single alternating current supply to a plurality of loads having individual switches or thermostats comprises triacs placed in series with each of the loads, a generator to generate a continuous series of firing pulses timed substantially to coincide with the zero crossing points of the alternating current supply which pulses are utilized to fire the triacs and control logic operative to direct immediately suceeding trains of the firing pulses to switch on different triacs for successive integral numbers of half cycles of the supply in accordance with a continuous programmable sequence, the control logic being programmed in accordance with the condition of the individual switches or thermostats associated with the loads and advanced through its sequence by a clock generator preferably driven or synchronized by the supply frequency.

Abstract: A sequencing system for a series of control circuits; each of which has its own control switch. A signal of spaced apart pulses is communicated simultaneously to all control switches. Separate normally closed grounding switches are provided for all but the first of the series of control switches to make them inoperative. Each control circuit after the first is provided with a connection which opens its grounding switch in response to power flowing through the preceeding control circuit of the series.

Abstract: Control system for limiting peak load demand and/or saving electrical energy by cycling the individual loads within an electrical distribution system. Electrical power usage in a distribution system is continuously monitored and compared to a pre-set limit. Loads can be added and cycled according to a limit set by the operator. Loads can also be dropped in response to a signal proportional to the electrical power usage in a distribution system within limits defined by the operator.

Abstract: A sequence controller, employing digital techniques, employs clock pulses to energize and deenergize incremental loads sequentially at spaced intervals to correct the deviation of a sensed condition from a setpoint. The clock is inhibited from producing pulses when no deviation requiring correction exists. A feedback provides anticipation for the effect of the energization and deenergization of condition changing loads. Hunting is substantially eliminated.

Abstract: The system for operating fire prevention devices comprises a plurality of fire prevention device operators successively operated directly or through another already operated operator in response to the operation of one of the fire detectors. Each of the operators includes switch means for switching the circuit from one operator to another when the fire prevention device associated therewith completes its operation. The switch means also function to switch the circuit upon the failure of the fire prevention device within a predetermined time.

Abstract: This disclosure describes power distribution with the use of semiconductor switches. A digital differential analyzer (DDA) selectively switches integer cycles of a generator into a load demand determined by analog sensing located at the work station associated with the load.

Abstract: A remote control system for operating electrical loads, particularly in multi-unit lodging establishments such as hotels, motels and the like, includes a power sensing circuit for deenergizing the loads when the power supplied varies beyond predetermined limits in voltage or phase, a restart circuit for sequentially reenergizing the loads with the time between reenergization of loads on successive buses being dependent upon the period of time the loads were deenergized in order not to produce an overload by simultaneous load operation under peak demand conditions, a start-up circuit for controlling the cycle period of the loads in accordance with outdoor temperature in order to provide efficient freeze protection and temperature maintenance, an excess manual switching circuit for comparing the number of loads presently energized with the number of loads energized at a predetermined prior time plus a preset number representing the maximum number of loads desired to be energized over the predetermined period of