Field service system for analog current analysis of digitally controlled power devices
First Claim
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1. A field service instrument for performing current analysis of electromechanical devices, comprising:
- a field-installable bus interface for transmitting digital control signals to a module that applies electrical current to an electromechanical device in response a specific digital control signals;
a current sensor for monitoring current to said electromechanical device;
a bus controller connected to said bus interface, said bus controller for applying said specific digital control signals to said module via said field-installable bus interface such that said current sensor monitors current to said electromechanical device;
an analog-to-digital converter for converting said current to said electromechanical device into a digital form;
a digital processor for obtaining a digital real time current profile of said digital form;
a memory for storing a baseline current profile for said electromechanical device; and
a fault determination network for comparing said digital real time current profile with said baseline current profile, the fault determination network comparing at least one of time-dependent peaks of the digital real time current profile, time-dependent peaks of the baseline current profile, and frequency-dependent peaks of the baseline current profile to determine degradation of the electromechanical device.
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Abstract
A fault detection system for performing analog current analysis and diagnosis of power devices on digitally controlled buses. The fault detection system includes a field-installable bus interface having a current sensor on a ground return line. A bus controller connected to the bus interface then applies digital control signals and power to a system assembly via the bus interface such that individual power devices are selectively energized. A real time current profile of the selected power device over a selected period of time is determined. A fault determination network compares the real time current against a set of predetermined criteria and determines whether the selected power device is acceptable. The predetermined criteria beneficially includes information useful for determining degradation of the selected power device so that fault correction before failure is feasible.
11 Citations
19 Claims
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1. A field service instrument for performing current analysis of electromechanical devices, comprising:
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a field-installable bus interface for transmitting digital control signals to a module that applies electrical current to an electromechanical device in response a specific digital control signals;
a current sensor for monitoring current to said electromechanical device;
a bus controller connected to said bus interface, said bus controller for applying said specific digital control signals to said module via said field-installable bus interface such that said current sensor monitors current to said electromechanical device;
an analog-to-digital converter for converting said current to said electromechanical device into a digital form;
a digital processor for obtaining a digital real time current profile of said digital form;
a memory for storing a baseline current profile for said electromechanical device; and
a fault determination network for comparing said digital real time current profile with said baseline current profile, the fault determination network comparing at least one of time-dependent peaks of the digital real time current profile, time-dependent peaks of the baseline current profile, and frequency-dependent peaks of the baseline current profile to determine degradation of the electromechanical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. A field service instrument including an electric current sensor connected to an on-board digital processor via an analog-to-digital converter, the on-board digital processor further being connected to an on-board bus interface controlled by an on-board bus controller and selectively connectable to an electromechanical device, the on-board bus interface transmitting digital control signals to the electromechanical device in response to the bus controller and the current sensor monitoring current supplied to the electromechanical device, the analog-to-digital converter providing a digital form of the monitored current to the digital processor, and the digital processor obtaining a real time digital current profile based on the digital form, the instrument further including a fault determination network that compares the digital current profile to a baseline current profile and uses results of the comparison to detect a fault in the electromechanical device, the fault determination network comparing at least one of time-dependent peaks of the digital real time current profile, time-dependent peaks of the baseline current profile, and frequency-dependent peaks of the baseline current profile to determine degradation of the electromechanical device.
Specification
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Current AssigneeXerox Corporation (Xerox Holdings Corp.)
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Original AssigneeXerox Corporation (Xerox Holdings Corp.)
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InventorsLewandowski, Robert, Abbata, Salvatore A.
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Primary Examiner(s)Brown, Glenn W.
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Assistant Examiner(s)Hamdan, Wasseem H.
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Application NumberUS09/411,577Time in Patent Office666 DaysField of Search324/511, 714/25, 710/109, 375/222, 379/93.32US Class Current324/511CPC Class CodesG01R 31/2829 Testing of circuits in sens...
