Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-12-11
1994-08-23
Pellinen, A. D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
361179, 361189, 340573, 192131R, 192129A, H01H 926
Patent
active
053410360
ABSTRACT:
A machine operator control station circuit which uses capacitive proximity switches to replicate the function of mechanical switches used in prior art control stations. A monitoring circuit for monitoring the "on" state of the capacitive proximity switches used in a two hand industrial machine control station is disclosed. The circuit also reduces the chance of unintended operation of the machine being controlled as a result of emitted or conducted radio frequency interference which might be detected by the capacitive proximity switches. An isolation transformer provides an isolated power supply for the monitoring circuit. The monitoring circuit includes a first capacitive proximity switch for detecting the presence of one of the machine operator's hands, and a second capacitive proximity switch for detecting the presence of the other of the machine operator's hands. Each proximity switch has a monitoring circuit for monitoring the length of time the proximity switch remains in the activated or "on" state. The monitoring circuits of the first and second proximity switches are connected together such that both switches must be activated within a set time window in order to activate the machine control circuit.
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Edwards, Jr. Stanley H.
Wheeler Keith D.
Fleming Fritz M.
Golden Larry I.
Pellinen A. D.
Shrout Larry T.
Square D Company
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