Frequency feedback on a current loop of a...

Details Frequency feedback on a current loop of a... Frequency feedback on a current loop of a...

G - Physics

05

D

341/39

G05D 19/02 (2006.01) F15B 5/00 (2006.01) G05D 16/20 (2006.01)

Patent

CA 1303704

ABSTRACT OF THE DISCLOSURE A current-to-pressure converter provides an output pressure as a function of the magnitude of a variable input DC current. The I/P converter includes a pressure sensor which produces a feedback signal representative of the output pressure. Based upon the feedback signal and the magnitude of the input DC current, an electrical control signal is produced which controls a device for varying the output pressure. The I/P converter also includes a circuit for generating a time-varying signal which is sent back over the current loop wires through which the input DC current flows. The time-varying signal provides an indication of whether the I/P converter is functioning properly. This permits diagnosis of possible causes of control system malfunctions without having to inspect the I/P converter itself.

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