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A fail-safe electronic position monitoring system for a motor is specifically described in a flame safeguard system. The same fail-safe system could be used more generally in any type of positional monitoring system using a potentiometer. The potentiometer and its wiper are monitored by a microcompu

A fail-safe electronic position monitoring system for a motor is specifically described in a flame safeguard system. The same fail-safe system could be used more generally in any type of positional monitoring system using a potentiometer. The potentiometer and its wiper are monitored by a microcomputer which has stored in its memory a profile of at least three critical parameters. The parameters are a low voltage parameter, a high voltage parameter, and a parameter that deals with the rate of the voltage level change. The rate voltage level change includes monotonocity function.

대표청구항 ▼

A flame safeguard sequencer system for the control of a fuel burner upon the operation of controller means with said fuel burner having damper means, ignition means, fuel supply means, and flame sensor means, including: a flame safeguard sequencer connected to said damper means, said ignition means,

A flame safeguard sequencer system for the control of a fuel burner upon the operation of controller means with said fuel burner having damper means, ignition means, fuel supply means, and flame sensor means, including: a flame safeguard sequencer connected to said damper means, said ignition means, said fuel supply means, and said flame sensor means to sequentially purge, ignite and operate said fuel burner in a predetermined timed sequence upon operation of said controller means; said flame sensor means energized by said sequencer to monitor said burner for the presence or absence of flame upon said controller means operating to initiate the operation of said fuel burner; a fail-safe position monitoring system for said damper means with said damper means having motor means and motor position feedback potentiometer means; said flame safeguard sequencer further having voltage output means; said voltage output means providing an energizing voltage to said potentiometer means; said motor means including said feedback potentiometer means with said motor means constructed and arranged to operate a wiper of said feedback potentiometer means to provide a feedback voltage to said flame safeguard sequencer as an indication of a position of said damper means; said sequencer having input means receiving said feedback voltage; said sequencer further including microcomputer means having memory means, and said microcomputer means with said memory means comparing said feedback voltage provided by said feedback potentiometer means and said energizing voltage with nominal voltage levels stored in said memory means for sensing proper operation of said sequencer; and said sequencer including in said microcomputer means a safety system means for comparison of said feedback voltage to an established nominal voltage level profile stored in said memory means to check the accuracy of the position monitoring system.