POSITIONER
First Claim
1. A positioner comprising:
- a control output generator calculating a deviation between a valve opening setting value sent from a higher-level device and an actual opening value that is fed back from a control valve that is subject to control, to generate, as a control signal, an electric signal in accordance with the deviation;
an electro-pneumatic converter converting into a pneumatic pressure signal the control output generated by the control output generator; and
a pneumatic pressure signal amplifier amplifying the pneumatic pressure signal converted by the electro-pneumatic converter and outputting, to an operating device for the control valve, as an amplified pneumatic pressure signal;
comprising;
a positioner operating mode identifier identifying automatically whether the operating mode of the positioner is in the positive operating mode wherein the greater the control output the greater the amplified pneumatic pressure signal, or the negative operating mode wherein the greater the control output the less the amplified pneumatic pressure signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A positioner operating mode identifying function is provided in a calculating unit. A pressure value of an amplified pneumatic pressure signal, from a single-mode pilot relay, is detected by a pressure sensor and sent to the calculating unit. The calculating unit, through the positioner operating mode identifying function, monitors a change in the amplified pneumatic pressure signal corresponding to a change in the control signal, and if the direction of change in the control output and the direction of change of the amplified pneumatic pressure signal are the identical direction, identifies the operating mode of the positioner as the positive operating mode. The operating mode of the positioner is identified as the negative operating mode if the direction of change in the control output and the direction of change of the amplified pneumatic pressure signal are the opposite directions. The identification results displayed on a screen of a display unit.
19 Citations
5 Claims
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1. A positioner comprising:
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a control output generator calculating a deviation between a valve opening setting value sent from a higher-level device and an actual opening value that is fed back from a control valve that is subject to control, to generate, as a control signal, an electric signal in accordance with the deviation; an electro-pneumatic converter converting into a pneumatic pressure signal the control output generated by the control output generator; and a pneumatic pressure signal amplifier amplifying the pneumatic pressure signal converted by the electro-pneumatic converter and outputting, to an operating device for the control valve, as an amplified pneumatic pressure signal;
comprising;a positioner operating mode identifier identifying automatically whether the operating mode of the positioner is in the positive operating mode wherein the greater the control output the greater the amplified pneumatic pressure signal, or the negative operating mode wherein the greater the control output the less the amplified pneumatic pressure signal. - View Dependent Claims (2, 3, 4, 5)
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Specification