Importance

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Abstract

An automatic transfer switch with time delayed emergency generator system is taught. The microprocessor is interconnected with a programming device and with a shift register whereby a countdown time is programmed into the shift register by way of the microprocessor. Furthermore, an oscillator is provided which in turn provides a continuous supply of one second countdown pulses which are normally prevented from reaching the input countdown terminal of the shift register by a disable gate which is controlled by an output signal from the microprocessor. When the microprocessor loses power which is indicative of the power from the main source disappearing, as is the situation where an emergency generator would be desired, the disable device is immediately turned off allowing the countdown pulses to reach the shift register, thus starting the one second by one second countdown operation. Unless the power returns again to cause the microprocessor to be re-energized a countdown pulse will eventually emanate from the output of the shift register as determined by the countdown time programmed thereinto previously. At this point in time, the emergency generator will be started.

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First Claim