Apparatus for and method of detecting a malfunction of a...

Details Apparatus for and method of detecting a malfunction of a... Apparatus for and method of detecting a malfunction of a...

G - Physics

01

R

G01R 31/00 (2006.01) G05B 5/01 (2006.01) G05B 9/02 (2006.01) G21D 3/06 (2006.01)

Patent

CA 2041419

- 23 - ABSTRACT OF THE DISCLOSURE An deviation E between a setting value SV and an actual phase value PV in a controller is integrated, and the resulting integrated value S is compared with a predetermined threshold D for detecting a malfunction. Checking a change in setting value SV, checking an increase or a decrease in deviation E and comparison with the absolute value ¦E x S¦ are made to ensure stability against fluctuations and rapid detection of a mal- function.

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