Malfunction detector

Details Malfunction detector Malfunction detector

1987-02-27

1989-06-06

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361189, 340652, H01H 4728, H01H 4732, H01H 900

Patent

active

048376566

ABSTRACT:
A malfunction detector is connected to switches provided in a machine, such as a punch press, for actuation when a malfunction occurs. The detector is capable of supplying an alternating current test signal to the switches and determining whether the resistance of the switches to the test signal is greater than or less than a threshold value. The test signal preferably has a frequency which is equal to mains supply frequency or a harmonic thereof and the malfunction detector preferably only responds to changes of state of the switches during specific time windows.

REFERENCES:
patent: 3597661 (1971-08-01), Isaacs
patent: 4074602 (1978-02-01), Brower
patent: 4500775 (1985-02-01), Sangu et al.
patent: 4677282 (1987-06-01), Walsh

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