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Allen-Bradley 20A User Manual

Allen-Bradley 20A
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Rockwell Automation Publication PFLEX-AT001L-EN-P - September 2017
Table of Contents
Preface
Waste Electrical and Electronic Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Product Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Personal Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Additional Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Summary of Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 1
Understanding How Dynamic Braking
Works
How Dynamic Braking Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Dynamic Brake Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 2
Determining Dynamic Brake
Requirements
How to Determine Dynamic Brake Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 11
Determine Values of Equation Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Example Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Chapter 3
Evaluating the PowerFlex 7-Class
Internal Resistor
Evaluating the Capability of the Internal Dynamic Brake Resistor. . . . . . . . . . . 23
PowerFlex 70 Power Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PowerFlex 700 Power Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
How to Evaluate a PowerFlex 750-Series Internal Resistor. . . . . . . . . . . . . . . . . . 32
Chapter 4
Selecting An External Resistor for
PowerFlex 7-Class Drives
How to Select an External Dynamic Brake Resistor for
PowerFlex 7-Class Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Appendix A
Minimum Dynamic Brake Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

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Allen-Bradley 20A Specifications

General IconGeneral
BrandAllen-Bradley
Model20A
CategoryController
LanguageEnglish

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