Electricity: measuring and testing – Electromechanical switching device – Relay
Patent
1982-02-26
1985-01-08
Tokar, Michael J.
Electricity: measuring and testing
Electromechanical switching device
Relay
324207, 324415, G01R 3102, G01R 3132
Patent
active
044929250
ABSTRACT:
The invention relates to a testing and evaluating circuit for a proximity itch suitable for testing and provided as an element of a machine control means; associated with the proximity switch is a control circuit, by which the proximity switch is alternately switchable between its two operating conditions to generate a timed output signal with a given frequency, an evaluating circuit being provided, by which a clear signal indicating fault-free operation is producable for the duration of a timed output signal from the proximity switch and by which a blocking signal for the machine control means, indicating a fault, is producable in the absence of changes in the potential of the output signal from the proximity switch. The evaluating circuit preferably comprises a relay circuit, to which the output signal from the proximity switch or a signal derived from this is fed via a transformer.
REFERENCES:
patent: 4270715 (1981-06-01), Norton et al.
patent: 4305556 (1981-12-01), Norton et al.
patent: 4323890 (1982-04-01), Lemke
patent: 4384251 (1983-05-01), Schelling et al.
Kammerer Heinz
Langheinrich Hans
Gebhard Balluff Fabrik feinmechanischer Erzeugnisse GmbH & Co.
O'Shea Kevin D.
Tokar Michael J.
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