Apparatus and method for collecting motor test data

• US 6,453,260 B1
• Filed: 04/25/2000
• Issued: 09/17/2002
• Est. Priority Date: 04/25/2000
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Prough, David Michael
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): Kim, Paul L
• Application Number:
  US09/558,442
• Time in Patent Office: 875 Days
• Field of Search: 702/132, 702/176, 361/24, 361/27, 361/106, 361/25, 361/23, 361/93.8, 318/472
• US Class Current: 702/132
• CPC Class Codes: H02H 3/044 Checking correct functioning of protective arrangements, e.g. by simulating a fault for differential current circuit breakers H02H3/335
• CPC Class Codes: H02H 7/0852 directly responsive to abnormal temperature by using a temperature sensor in a control circuit H02H7/0833

Abstract

A system for motor thermal protector device performance test data collection includes a microprocessor configured to measure elapsed times of reset and trip power cycles of a motor winding through a thermal protector device. An operator interface terminal is coupled to the microprocessor and includes a display and input selectors for recalling a predetermined number of elapsed reset and trip times stored in a system memory.

Claims

1. A method for collecting thermal protector device test data of a motor using a data collector system, the motor including a motor winding and a thermal protector device, the thermal protector device cycling between a reset position and a trip position to cycle power to the motor winding, the data collector including a microprocessor configured to measure elapsed times of reset and trip power cycles of a motor winding through the thermal protector device, a memory for storing the reset and trip times, and an operator interface terminal for displaying the reset and trip times, the operator interface terminal having at least one input selector, said method comprising the step of:

coupling the data collector to the motor;

energizing the motor winding;

measuring a plurality of elapsed reset and trip times of the thermal protector with the microprocessor;

storing the plurality of reset and trip times in the microprocessor memory; and

displaying selected stored reset and trip times to an operator with the operator interface terminal in response to manipulation of the input selector.

2. A method in accordance with claim 1 wherein said step of storing the plurality of reset and trip times in the microprocessor memory comprises the step of storing a predetermined number of reset and trip times.

3. A method in accordance with claim 2 further comprising the step of storing only a last reset and last trip time after the predetermined number of reset and trip times have been stored.

4. A method in accordance with claim 3 wherein said step of storing only a last reset and trip time comprises the step of storing only a last reset and trip time after five reset times and five trip times have been stored.

5. A method in accordance with claim 1 further comprising the step of resetting the stored reset and trip times to zero upon user manipulation of the at least one input selector.

6. A method in accordance with claim 1 wherein said step of measuring a plurality of elapsed reset and trip times of the thermal protector with the microprocessor comprises the step of measuring elapsed reset time and elapsed trip time at a resolution of 0.1 seconds.

7. A method in accordance with claim 1 further comprising the step of storing a total number of timed power cycles of the motor winding in the microprocessor memory.

8. A method in accordance with claim 1 further comprising the step of resetting the data collector in response to operator manipulation of the operator interface terminal.

9. A method in accordance with claim 1 further comprising the step of displaying a current cycle count on the operator interface terminal.

10. A system for motor thermal protector data collection for a motor including a motor winding and a thermal protector device, the thermal protector device cycling between a reset position and a trip position to cycle power to the motor winding, said system comprising:

a microprocessor configured to measure elapsed times of reset and trip power cycles of the motor winding through the thermal protector device;

a memory for storing and recalling said elapsed times; and

an operator interface terminal coupled to said microprocessor and comprising a display and at least one input selector, said microprocessor and display configured for displaying said elapsed reset and trip times in response to user manipulation of said input selector.

11. A system in accordance with claim 10 wherein said microprocessor is configured to measure said elapsed reset times and trip times at a resolution of 0.1 seconds.

12. A system according to claim 10 wherein said microprocessor is configured to store a pre-determined number of reset and trip times in said memory.

13. A system in accordance with claim 12 wherein said pre-determined number is five.

14. A system in accordance with claim 12 wherein said microprocessor is configured to store said pre-determined number of reset and trip times and thereafter store reset and trip times of a last timed power cycle of the motor winding.

15. A system in accordance with claim 10 wherein said microprocessor is configured to store a total number of timed power cycles of the motor winding.

16. A system in accordance with claim 10 wherein said microprocessor and said memory comprise a programmable logic controller.

17. A system in accordance with claim 10 further comprising a current sensor coupled to said microprocessor and configured for coupling to the motor in series with the thermal protector, said current sensor providing a signal to said microprocessor for measuring said elapsed reset times and said elapsed trip times.

18. A system for motor thermal protector data collection, the motor including a motor winding and a thermal protective device, the thermal protector device cycling between a reset position and a trip position to cycle power to the motor winding, said system comprising:

a programmable logic controller configured to measure a plurality of elapsed times of reset and trip power cycles of the motor winding through the thermal protector device, said programmable logic controller further having a memory for storing said elapsed reset times and said elapsed trip times; and

an operator interface terminal coupled to said programmable logic controller and comprising at least one input selector, said operator interface terminal configured to display a pre-determined number of said stored elapsed reset times and said elapsed trip times upon user manipulation of said at least one input selector.

19. A system in accordance with claim 18 wherein said predetermined number of stored elapsed times is five, said pre-determined number of stored trip times is five.

20. A system in accordance with claim 18 further comprising a current sensor coupled to said microprocessor and configured for coupling to the motor in series with the thermal protector device, said current sensor providing a signal to said microprocessor for measuring said elapsed reset times and said elapsed trip times.