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October 2005

In this issue

puce Classes and seminars
puce About us
puce Trick of the month
puce To contact us

See our previous issues :
http://www.topcontrol.com/techinfo/news.php



Classes & seminars

Detailed Loop Analysis with ExperTune
October 22-24, 2005 - Chicago IL and
November 30 - December 2, 2005 - Clearwater Beach FL

Analytical Methods for Troubleshooting and Control Loop Tuning
October 25-27, 2005 - Kingston ON,
November 15-17, 2005 - Houston TX,
November 22-24, 2005 - Moncton NB and
November 22-24, 2005 - Vancouver BC


About us

See our 2005 calendar, Classes & Seminars :

See at : http://www.topcontrol.com/training/tcalendar.php


Article

An article by Martin Emond is published in Control Magazine, September issue:
"What's wrong with those ramps"

An article by Michel Ruel is published in Industrial Process Product & Technology, September issue:
"Performance supervision"


Conference by Michel Ruel at ISA 2005 Chicago (meet us at booth 2010)

Benchmarking your Process Using Simple Key Performance Indices
Performance Management
Thursday, October 27th
Time : 2:00 p.m. - 3:30 p.m.

Performance Monitoring and Supervision - an Economic Point of View
Economics of Asset Management
Wednesday, October 26th
Time : 3:45 p.m. - 5:15 p.m.



Trick of the month : Variable speed drive?

When a variable speed drive is used as a final control element, it is essential to verify its configuration (new drives have more than 200 parameters). For example if a variable speed pump is controlling a flow, the most important parameters to verify are:

  • Low speed limit; should be the minimum speed ensuring that the pressure is sufficient to obtain a flow; if the minimum speed is too low, at low controller output, the flow will remain zero (cycling at low controller output).
  • Torque/Speed characteristic; to ensure that the speed control remains stable over all the range.
  • Maximum current; if that parameter is too low, quick changes and high speed will be limited and the loop response will be different.
  • Acceleration/Deceleration; if too low, loop reponse will be different for small changes and large changes.

Configuring properly the parameters in the variable speed drive ios important, however, tuning the loop will require some precaution… next month Top News will explain briefly how to do it.



To contact us

Comments, suggestions and requests are welcomed. Please e-mail us at: info@topcontrol.com

You are welcomed to visit our web site :http://www.topcontrol.com

puce

49 Bel-Air Street, Lévis, QC
G6V 6K9, Canada
Phone: (418) 834-2242
Fax: (418) 834-2651  

puce

1020 James Drive, Suite A
Hartland, WI 53029
Toll free: (877) 867-6473