Circuit for testing two switch or relay contacts simultaneously in automatic control systems
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Nov 18, 1993
filing date -
Mar 8, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to provide a dependable check on the reliable functioning of contacts of switches or relays which control a control device, to ascertain whether they occupy the desired rest contact position and/or have a sufficiently high mains voltage, the rest contacts of the two switches can be connected in parallel by way of a respective electrical resistor to a pole of the voltage source and both resistors can be connected in series to a charging capacitor which, upon the attainment of a given electrical charge or voltage (threshold voltage) activates the control device and in particular feeds a threshold switch or itself serves as such.
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