Browse Prior Art Database

Incremental Drive for Process Controller Set Point

IP.com Disclosure Number: IPCOM000098318D
Original Publication Date: 1960-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Leverett, TW: AUTHOR

Abstract

The apparatus allows a computer to adjust the process controller set point.

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Incremental Drive for Process Controller Set Point

The apparatus allows a computer to adjust the process controller set point.

Set point on a process controller is usually set by operator control of a knob which, in turn, may either set a pressure regulator or operate a mechanical linkage or operate an electrical control. Here, the function of setting the knob is performed by a bi-directional stepping motor which receives impulses from a computer. When the lines to the stepping motor are disconnected by the control switch, the set point will not change automatically and the operator may resume normal control of set point.

The apparatus features three significant advantages. First, the controller set point device may receive electrical pulses rather than a continuous analog signal. Second, by disconnecting the signal lines to the stepping motor, the operator may take over control of set point and may relinquish control by reconnecting the signal lines. Third, in case of loss of signal to the device the set point remains at its last setting until the signal is restored or the operator takes over control.

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