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Drives for Web Handling

Blogmaster: Clarence Klassen

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07

Drives tuned too slow

Posted by Clarence Klassen on May 7, 2012
Drives tuned too slow
At the IWEB conference at Oklahoma State University in 2011, one of the feature speakers, Dr. Günther Brandenburg, presented an interesting paper about tension control for printers. In the course of his research with a major printer manufacturer, he noted the requirement for faster tension regu...

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Posted in: Tension Measurement and Control, Tuning, Design
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30

Simple as Possible, Accurate as Necessary

Posted by Clarence Klassen on April 30, 2012
Simple as Possible, Accurate as Necessary
Dr. Günther Brandenburg, speaking at the IWEB conference at Oklahoma State University in 2011 spoke of making the controls as Simple as Possible, but as Accurate as Necessary. His keynote address was titled "Advanced Process Models and Control Strategies for Rotary Printing Presses". This soun...

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Posted in: Tension Measurement and Control, Tuning, Design, Measurement
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23

Processor Power

Posted by Clarence Klassen on April 23, 2012
Processor Power
When I started my career in drive control and automation, I tried hard to do the most with the least processor power and the least memory. I learned which data types used the least memory and executed the quickest. We all knew that no one could possibly use 64K of memory. That policy of conserving ...

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Posted in: Tuning, Design
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09

Torque Boost

Posted by Clarence Klassen on April 9, 2012
Torque Boost
  Often the Torque Hold function provides adequate tension during most of the index, but may not provide enough tension for a good clean cut. The knife may require a very taut web if the web is stretchy. In this case, Torque Boost is required. Torque Boost is used instead of Tension Boost, be...

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Posted in: Tension Measurement and Control, Definitions, Design, Center Winding, Turret Winders
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26

Torque Hold

Posted by Clarence Klassen on March 26, 2012
Torque Hold
Many events happen during a turret winder index that make it very difficult to control tension. An old, but practical, technique for surviving an index is to put the outgoing spindle into Torque Hold mode. Torque Hold is a drive function that memorizes the torque at a particular instant, and then...

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Posted in: Tension Measurement and Control, Definitions, Design, Center Winding, Turret Winders
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19

Tension Boost

Posted by Clarence Klassen on March 19, 2012
Tension Boost
One of the drive tools available for turret winder applications is tension boost. This function is different than torque boost. Tension boost is not always required. It may be required if the winder includes a layon roller or rider roller. The layon roller is removed for the turret index and thus t...

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Posted in: Tension Measurement and Control, Definitions, Design, Center Winding, Turret Winders
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12

Virtual Machines

Posted by Clarence Klassen on March 12, 2012
Virtual Machines
Many older drive systems rely on programming tools that will only run on older operating systems. The drive program may run only on an old DOS or Windows operating system. Newer operating systems on modern computers simply laugh when you try to install the drive program. One way of keeping these ol...

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Posted in: Maintenance, Design, Communications
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05

Tension Variations Cause Web Displacement (MD and CD)

Posted by Clarence Klassen on March 5, 2012
Tension Variations Cause Web Displacement (MD and CD)
While not the only cause, it is well known that tension variations cause a web to move in the cross machine direction. The web displacement or movement can be in either direction, to the operator side or to the back side. With many webs the displacement can cause severe problems. Some of the proble...

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Posted in: Tension Measurement and Control, Design
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27

Servo Drives vs. Vector Drives

Posted by Clarence Klassen on February 27, 2012
Servo Drives vs. Vector Drives
According to dictionary definitions, there is no difference between servo drives and vector drives. Any drive with an encoder and closed loop speed regulation is a servo drive. In industry the servo drive is considered a higher performance and premium priced drive. Vector drives are usually tuned w...

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Posted in: Definitions, Design
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20

Remote Access

Posted by Clarence Klassen on February 20, 2012
Remote Access
Today most companies expect remote access troubleshooting from suppliers of drive systems. Remote access software over the internet and using Virtual Private Networks (VPN) or web based remote access provide very useful remote access. Technically remote access can be performed two ways. A custome...

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Posted in: Tuning, Maintenance, Design, Communications
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Blogmaster

Clarence Klassen photo

Clarence Klassen

President. Designated Consulting Engineer with Professional Engineers Ontario (PEO). KlassENgineering was incorporated in 1999. Clarence applies 31 years in the Pulp and Paper industry to solving problems with drives for web handling. He has 10 years experience as a drives engineer with GE Canada and 10 years experience with Opcode Systems Inc., a PLC and Drives Systems Integrator. Much of Clarence's experience was gained in onsite installation of new equipment and troubleshooting of existing equipment. KlassENgineering performs Pre-Start Health and Safety Reviews as required by the Ontario Ministry of Labour.