Improved low level voltage programmable logic control

Details Improved low level voltage programmable logic control Improved low level voltage programmable logic control

H - Electricity

02

H

H02H 3/05 (2006.01) G05B 19/05 (2006.01) G21C 17/00 (2006.01) H01H 71/02 (2006.01) H01H 71/10 (2006.01) H01H 71/74 (2006.01) H01H 83/02 (2006.01)

Patent

CA 2580873

An improved programmable logic control device for monitoring the current of a circuit and for signalling a circuit control device, the programmable logic control device including electrical power circuitry for activating the circuit control device and electrical circuitry for monitoring the current in the electrical circuit, the electrical circuitry including: adjustable electrical signal input circuitry to monitor the electrical current in the circuit; adjustable pick-up circuitry for adjusting the level of the current monitored in the electrical circuit, the pick-up circuitry having a thermister means for improved stabilization; adjustable time circuitry to command the electrical power circuitry to activate the circuit control device when the electrical current in the electrical circuit reaches the selected level and time duration, the time circuitry having an increased time duration to minimize nuisance tripping; and a zener diode in reverse mode for controlling the level of voltage applied to the adjustable pick-up circuitry and time circuitry substantially without resistive burden, the zener diode in reverse mode passing a reference voltage which is less than an input voltage to the said device. The device is preferably packaged in material that is resistant to radiation, such as ceramic, and is well-suited for harsh environment applications.

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