Method of monitoring a contactor

Details Method of monitoring a contactor Method of monitoring a contactor

1996-06-25

1997-09-16

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361159, 361154, 361153, H01H 4728

Patent

active

056686935

ABSTRACT:
A varying voltage is applied across a coil of a contactor. The varying voltage has a characteristic (frequency) which varies as a function of the position of the armature. The varying voltage is transmitted to a coupler which transmits information to a controller. The coupler may include one or more light sources (LEDs) which are sequentially energized and de-energized to sequentially render a phototransistor conducting and nonconducting. The frequency of the output from the coupler corresponds to the frequency at which the phototransistor is changed between the conducting and nonconducting conditions. A controller determines whether the frequency of the output from the coupler corresponds to the intended position of the armature of the contactor or to an unintended position by comparing the frequency of the output from the coupler to known frequencies for various positions of the armature.

REFERENCES:
patent: 4833565 (1989-05-01), Bauer et al.
patent: 4905121 (1990-02-01), Uetsuhara et al.
patent: 5053911 (1991-10-01), Kopec et al.
patent: 5270900 (1993-12-01), Alden et al.
patent: 5442515 (1995-08-01), Wallaert
patent: 5486972 (1996-01-01), Taylor
patent: 5539608 (1996-07-01), Hurley et al.

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