Method and apparatus for automatic transfer switch
View Patent ↗An automatic transfer switch includes; a housing, at least one switch for switching electrical connection from a first external power source to a second external power source, and a first and at least a second timer disposed within the housing, wherein the first and the at least a second timer have a first and at least a second time delay, respectively. The at least one switch being responsive to the first and the at least a second timer, and the at least a second time delay being nested within the first time delay.
1. A method of switching an automatic transfer switch between first and second power sources comprising:
receiving a first control signal at a first timer in response to a below-threshold signal at a primary source;
initiating a first time delay at a first tinier in response to said first control signal;
receiving a second control signal at a second timer from said controller;
initiating a second time delay at a second timer in response to said second control signal;
completing said first time delay;
completing said second lime delay; and
transferring the electrical connection from the first power source to the second power source in response to said first and second time delays; wherein
said second time delay is nested within said first time delay.
2. The method of claim 1 , wherein:
said initiating a second time delay at a second timer, comprises;
initiating the beginning time of said second time delay in response to the end time of said first time delay.
3. The method of claim 1 , wherein:
said receiving a first control signal at a first timer comprises receiving a first logic timing function at a controller; and wherein
said receiving a second control signal at a second timer comprises receiving a second logic timing function at a controller.
4. An automatic transfer switch, comprising:
means for receiving a first control signal at a first timer in response to a below-threshold signal at a primary source;
means for initiating a first time delay at a first timer in response to said first control signal;
means for receiving a second control signal at a second timer from said controller;
means for initiating a second time delay at a second timer in response to said second control signal;
means for completing said first time delay;
means rot completing said second time delay; and
means for transferring the electrical connection from the first power source to die second power source in response to said first and second time delays; wherein
said second time delay is nested within said first time delay.
5. The automatic transfer switch of claim 4 , wherein said means for initiating a second time delay at a second timer, comprises:
means for initiating the beginning time of said second time delay in response to the end time of said first time delay.
6. The automatic transfer switch of claim 4 , wherein:
said means for receiving a first control signal at a first timer comprises means for receiving a first logic timing function at a controller; and
said means for receiving a second control signal at a second timer comprises means for receiving a second logic timing function at a controller.