TRANSFER SWITCH CONTROLLER PROVIDING AN ALTERNATING CURRENT VOLTAGE TO A GENERATOR AND TRANSFER SWITCH INCLUDING THE SAME

• US 20090179498A1
• Filed: 01/14/2008
• Published: 07/16/2009
• Est. Priority Date: 01/14/2008
• Status: Abandoned Application

• Current Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: LATHROP, TODD M., Hjemvick, Jacob A., Popovich, Bert
• Application Number:
  US12/013,663
• Publication Number:
  US 20090179498A1
• Time in Patent Office: Days
• US Class Current: 307/68
• CPC Class Codes: H01H 47/32 Energising current supplied by semiconductor device

Abstract

A transfer switch controller is for a transfer switch. The transfer switch controller includes a first input having an alternating current voltage and structured to input power from a utility power source, second inputs structured to input remote or local signals, and an output structured to output an alternating current voltage to a standby generator. A normally closed switch, such as a relay, includes a number of normally closed contacts electrically connected between the first input and the output. The normally closed contacts are normally closed to cause the alternating current voltage of the first input to be normally output to the alternating current voltage of the output. A microprocessor cooperates with the second inputs and the normally closed switch. The microprocessor causes the normally closed switch to open responsive to one or more of the remote or local signals.

Claims

1. A transfer switch controller for a transfer switch, said transfer switch controller comprising:

a first input structured to input power from a power source, said first input having an alternating current voltage;

a number of second inputs structured to input a number of signals;

an output structured to output an alternating current voltage to a generator;

a normally closed switch electrically connected between said first input and said output, said normally closed switch being normally closed to cause the alternating current voltage of said first input to be normally output to the alternating current voltage of said output; and

a circuit cooperating with said number of second inputs and said normally closed switch, said circuit being structured to cause said normally closed switch to open responsive to at least one of said number of signals.

2. The transfer switch controller of claim 1 wherein said circuit comprises a processor.

3. The transfer switch controller of claim 2 wherein said number of signals have an active state and an inactive state;

wherein said normally closed switch is a relay including an input and a number of normally closed contacts; and

wherein said processor comprises a routine, a number of inputs structured to receive said number of signals, and an output structured to energize the input of said relay, said routine being structured to determine the active state of said number of signals and responsively cause the output of said processor to energize the input of said relay and open said number of normally closed contacts.

4. The transfer switch controller of claim 3 wherein said first input comprises two input terminals;

wherein said output of said transfer switch controller comprises two output terminals; and

wherein said number of normally closed contacts are two normally closed contacts, each of said two normally closed contacts being electrically connected in series between a corresponding one of said two input terminals and a corresponding one of said two output terminals.

5. The transfer switch controller of claim 1 wherein said first input comprises two input terminals;

wherein said output comprises two output terminals; and

wherein said normally closed switch comprises two normally closed contacts, each of said two normally closed contacts being electrically connected in series between a corresponding one of said two input terminals and a corresponding one of said two output terminals.

6. The transfer switch controller of claim 1 wherein said first input comprises two input terminals;

and wherein said output comprises two fuses and two output terminals, each of said two fuses being electrically connected in series between a corresponding one of said two input terminals and a corresponding one of said two output terminals.

7. The transfer switch controller of claim 1 wherein said circuit comprises a normally open contact structured to receive a battery voltage and a normally closed contact structured to receive said battery voltage;

and wherein said circuit is further structured to cause said normally open contact to close responsive to at least one of said number of signals and to cause said normally closed contact to open responsive to at least one of said number of signals.

8. The transfer switch controller of claim 1 wherein said circuit comprises a normally open contact structured to receive a battery voltage and a normally closed contact structured to receive said battery voltage;

wherein said number of signals have an active state and an inactive state;

wherein the alternating current voltage of said first input has a normal state and an undervoltage state; and

wherein said circuit is further structured to cause said normally open contact to close, said normally closed contact to open, and said normally closed switch to open when said number of signals have the inactive state and when the alternating current voltage of said first input has the undervoltage state.

9. The transfer switch controller of claim 1 wherein one of said number of signals is a remote signal including an active state and an inactive state;

and wherein said circuit is further structured to cause said normally closed switch to open responsive to said active state of said remote signal.

10. The transfer switch controller of claim 1 wherein said number of signals have an active state and an inactive state;

wherein the alternating current voltage of said first input has a normal state and an undervoltage state; and

wherein said circuit is further structured to cause said normally closed switch to open when said number of signals have the inactive state and when the alternating current voltage of said first input has the undervoltage state.

11. The transfer switch controller of claim 1 wherein said circuit comprises a timer structured to output one of said number of signals to a corresponding one of said number of second inputs;

wherein said one of said number of signals of the corresponding one of said number of second inputs has an active state and an inactive state; and

wherein said circuit is further structured to cause said normally closed switch to open responsive to said active state.

12. A transfer switch comprising:

a first input structured to input power from a first power source, said first input having an alternating current voltage;

a second input structured to input power from a second power source;

a first output structured to output power to a load;

a second output structured to output an alternating current voltage to a generator;

a transfer mechanism structured to selectively electrically connect one of said first input and said second input to said first output; and

a control mechanism cooperating with said first input, said second input and said transfer mechanism to cause said transfer mechanism to electrically connect one of said first input and said second input to said first output, said control mechanism comprising;

a number of third inputs structured to input a number of signals,

a normally closed switch electrically connected between said first input and said second output, said normally closed switch being normally closed to cause the alternating current voltage of said first input to be normally output to the alternating current voltage of said second output, and

a circuit cooperating with said number of third inputs and said normally closed switch, said circuit being structured to cause said normally closed switch to open responsive to at least one of said number of signals.

13. The transfer switch of claim 12 wherein said circuit comprises a normally open contact structured to receive a battery voltage, said circuit being further structured to cause said normally open contact to close responsive to at least one of said number of signals.

14. The transfer switch of claim 12 wherein said circuit comprises a normally closed contact structured to receive a battery voltage, said circuit being further structured to cause said normally closed contact to open responsive to at least one of said number of signals.

15. The transfer switch of claim 12 wherein one of said number of signals is a remote signal having an active state and an inactive state;

and wherein said circuit is further structured to cause said normally closed switch to open responsive to said active state.

16. The transfer switch of claim 12 wherein said control mechanism further comprises a timer structured to output one of said number of signals to a corresponding one of said number of third inputs;

wherein said one of said number of signals of the corresponding one of said number of third inputs has an active state and an inactive state; and

wherein said circuit is further structured to cause said normally closed switch to open responsive to said active state.

17. The transfer switch of claim 12 wherein said circuit comprises a normally open contact structured to receive a battery voltage and a normally closed contact structured to receive said battery voltage;

and wherein said circuit is further structured to cause said normally open contact to close responsive to at least one of said number of signals and to cause said normally closed contact to open responsive to at least one of said number of signals.

18. The transfer switch of claim 12 wherein said circuit comprises a normally open contact structured to receive a battery voltage and a normally closed contact structured to receive said battery voltage;

wherein said number of signals have an active state and an inactive state;

wherein the alternating current voltage of said first input has a normal state and an undervoltage state; and

wherein said circuit is further structured to cause said normally open contact to close, said normally closed contact to open, and said normally closed switch to open when said number of signals have the inactive state and when the alternating current voltage of said first input has the undervoltage state.

19. The transfer switch of claim 12 wherein one of said number of signals includes an active state and an inactive state;

and wherein said circuit is further structured to cause said normally closed switch to open responsive to said active state of said one of said number of signals.

20. The transfer switch of claim 19 wherein said circuit is further structured to cause said transfer mechanism to electrically connect said second input to said first output responsive to said active state of said one of said number of signals.

21. The transfer switch of claim 19 wherein said circuit is further structured to cause said transfer mechanism to electrically connect said first input to said first output responsive to said active state of said one of said number of signals.

22. The transfer switch of claim 12 wherein said number of signals have an active state and an inactive state;

wherein the alternating current voltage of said first input has a normal state and an undervoltage state; and

wherein said circuit is further structured to cause said normally closed switch to open when said number of signals have the inactive state and when the alternating current voltage of said first input has the undervoltage state.

23. The transfer switch of claim 12 wherein said second output comprises at least one fuse electrically connected in series between said first input and said second output.