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TAPPI 99 Papers
The following papers are being presented at TAPPI 1999 PCE&I joint conference in
Atlanta, GA, March 1-4.
Moving Paper
Machine CD Profiling into the Mill Control System
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Daniel Parker, P.E.
President
PARKERMESSANA™
Federal Way, Washington 98003 |
Steve Pittman, P.E.
Electrical Engineer
Potlatch Corporation
Lewiston, Idaho 83501 |
ABSTRACT
Migration of Cross Directional
(CD) profile control from stand-alone computers to a common plant control system (DCS,
PLC, HMI, etc.) is discussed. CD profile control of moisture, caliper, and basis weight on
a paper machine is typically performed by stand-alone control systems. These systems
require dedicated control hardware that can be difficult to maintain, provides limited
flexibility to operations, and do not easily provide information to plant MIS systems.
Moving the CD profile control into a plant’s
common control platform is often thought to be high risk and high cost. This does not need
to be the case. A methodical approach, allowing a backward migration path, can be
implemented at minimal risk and cost. Examples are given from actual mill experience in
implementing CD controls in a DCS platform. In these case studies, it is shown that for a
relatively low cost, the system has significant benefits in reduced maintenance, increased
control flexibility and access of information from the MIS.
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Which Control
Option Do I Go With?
DCS, Mini-DCS or PLC?
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Kevin Stively
Senior Process Controls Engineer
PARKERMESSANA™
Federal Way, Washington 98003 |
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ABSTRACT
In today’s world of automation,
you now have many cost effective control solutions that allow for advanced computer
control. With these advanced control solutions come the gigabytes of process data that can
be utilized for quality control, process optimization and maximizing equipment capacity.
Each type of system has different costs associated with their implementation. Many of
these costs are associated with proprietary, semi-open control solutions. With advances in
PLCs, personal computers and operating systems, end users now have the ability to install
cost competitive control solutions while maintaining the quality of control and data
availability. The base process to be used in the control solution comparison is a vacuum
washer line with knotting and screening. The three systems solutions for the comparison
will be a traditional DCS, mini-DCS and PLC/PC (SCADA control).
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