Method and apparatus for adjusting a bimetal trip element

Details Method and apparatus for adjusting a bimetal trip element Method and apparatus for adjusting a bimetal trip element

1989-03-22

1990-08-07

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electromechanical switching device

Thermostat switch

324424, G01R 3132

Patent

active

049471228

ABSTRACT:
A method and apparatus for adjusting a bimetal trip element. The object is to provide a method to adjust bimetal trip elements for electric switching devices, which produces a reliable result in a standard number of adjustment steps. Based on the measurement of the path that a tripping shaft travels until the latching is released and of the force required for this, a processor computes a value, which is used to set-up an adjusting screw. Subsequentially, when the bimetal strip is heated as a function of current, the time it takes the bimetal strip to travel until contact is made with the adjusting screws and also the total tripping time are determined. From these values, the processor computes a correction value to control a screwdriver which adjusts the adjusting screw. An auxiliary device contains a contact slide to incorporate the adjusting screws and the bimetal strips in a signal circuit, as well as a driving arrangement to move the contact slide. The adjustment procedure is suited for the bimetal trip elements in low-voltage circuit-breakers, especially in tripping units, which are designed for applications in compact switching devices with housings made of insulating material.

REFERENCES:
patent: 3162739 (1964-12-01), Klein et al.
patent: 3244837 (1966-04-01), Strobel
patent: 3259839 (1966-07-01), Coleman et al.
patent: 3757207 (1973-09-01), Hire
patent: 3815064 (1974-06-01), Maier et al.
patent: 3947758 (1976-03-01), Sutton

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