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Drives for Web Handling

Blogmaster: Clarence Klassen

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Safety

16

I Saw a Generator Flash

Posted by Clarence Klassen on April 16, 2012
I Saw a Generator Flash
This week while calmly investigating drive performance on a very old drive system, I saw it happen - a massive commutator flash on the dc generator feeding a drive motor for a web handling line. No one was hurt. The Motor-Generator (M-G) system is over 50 years old-but so am I. The motors and gener...

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Posted in: Safety, Maintenance
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14

Vibration Sensors Built In

Posted by Clarence Klassen on November 14, 2011
Vibration Sensors Built In
Vibration in high-speed winding equipment can have severe consequences. Specifically I am referring to paper slitter/winders. The vibration typically begins with a non-uniform gauge or caliper across the width of the machine. Once started, the vibration can build, moving the cores off center in t...

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Posted in: Safety
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17

E-Stop Deceleration Rate

Posted by Clarence Klassen on October 17, 2011
E-Stop Deceleration Rate
Standards for emergency stopping rates of web handling equipment are not prescribed. There is a standard that calenders must stop in the distance between the finger tip and shoulder. This is untenable in 2011. We can and must do better. A few comments about safety and stopping. -  &nb...

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Posted in: Drives, Safety, Definitions
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15

Permanent Magnet Motors

Posted by Clarence Klassen on August 15, 2011
Permanent Magnet Motors
Permanent magnet (PM) motors have found a lot of application in web handling in recent years. The rotor is magnetized with permanent magnets rather than squirrel cage induction as in an induction motor or a dc field requiring an exciter as in as synchronous motor. The PM motor has the advantage that...

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Posted in: Drives, Safety, Design
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08

Static Bar Hazards

Posted by Clarence Klassen on August 8, 2011
Static Bar Hazards
Static charge created in web handling, unwinding and winding creates problems for web handling, the electronics controlling the process and is a safety hazard for personnel. A presentation by Kelly Robinson at IWEB 2011 discussed many of the issues with static and how to reduce it. The static volta...

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Posted in: Safety
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10

I Hear You Knocking

Posted by Clarence Klassen on May 10, 2011
I Hear You Knocking
But you can’t come in. Some sections of web handling equipment are inherently hazardous. This includes inrunning nips, entanglement hazards, knives, and high voltage static control strips. In the past 4 years, I have seen increased compliance in guarding the equipment to current applicable saf...

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Posted in: Safety, Design
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12

Safety Planning and Review

Posted by Clarence Klassen on April 12, 2010
Today I was asked to participate in the safety planning for a motor test procedure. What made this infrequent procedure unusual is that it is a repeat of a test that resulted in a severe arc flash injury nearly 30 years ago. This involved months of recovery. Being a very brave man, the technologist ...

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Posted in: Safety
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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.