Paper Machine Adjustable Drives

SKU: C-758Duration: 23 Minutes Certificate Included

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Course Details

Specs

Training Time: 23 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Sectional drive technology has evolved over the years and advancements in drive and motor designs are continuously being made. Innovations have allowed for increasingly higher machine speeds and production rates. Yet, for all of the advancements in technology, the purpose of sectional drive systems remains the same. That is to give the papermaker a means of controlling the speed and tension of the paper web as it is transferred from one section to another. AC sectional drives are most common on newer machines because of the durability, energy efficiency and affordability of AC motors. This module covers the purpose, types, and operation of paper machine adjustable drives.

Learning Objectives

At the end of this module, you will be able to:

  • State the purpose of adjustable speed drives
  • Identify and describe the different types of adjustable speed drives
  • Describe the importance of draw
  • Identify and describe different section control modes
  • Identify and describe safety hazards and guidelines associated with paper machine drives

Key Questions

The following key questions are answered in this module:

What is draw?
Draw is the speed difference between the sections of a paper machine and is usually expressed as a percentage.

How do DC drives work?
DC drives control the speed of the motor by varying the voltage. A DC motor's speed varies proportionally with the applied voltage.

How do AC drives work?
AC drives control the speed of the motor by changing the frequency supplied to the motor. The motor speed is directly proportional frequency.

What are common sectional controls?
Each section of the machine usually has run, stop, jog, crawl or slow, slack take-up, and draw controls.

What is a regenerative drive?
Under braking conditions, regenerative drives convert mechanical energy of the motor and connected load into electrical energy.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

The first type of sectional drives developed were adjustable voltage direct current drives. This type of drive operates on the principle that a DC motor's speed varies proportionally with the applied voltage. DC drives consist of a silicon controlled rectifier bridge which converts incoming AC volts to DC volts. During this conversion process, DC drives can regulate speed, torque, voltage, and current conditions of the DC motor.

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