PowerFlex Dynamic Braking Resistor Calculator

PowerFlex Dynamic Braking Resistor Calculator

Catalog Numbers 20A, 20B, 20F, 20G, 22A, 22B

Application Technique

Original Instructions

PowerFlex Dynamic Braking Resistor Calculator Application Technique

Important User Information

Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards. Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice. If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment. The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams. No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual. Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited. Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.

IMPORTANT Identifies information that is critical for successful application and understanding of the product.

These labels may also be on or inside the equipment to provide specific precautions.

SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.

ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

The following icon may appear in the text of this document.

Identifies information that is useful and can help to make a process easier to do or easier to understand.

2

Rockwell Automation Publication PFLEX-AT001M-EN-P - October 2022

Table of Contents

Read the General Precautions

Waste Electrical and Electronic Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Product Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Personal Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Additional Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 1

UnderstandingHowDynamicBraking How Dynamic Braking Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Works

Dynamic Brake Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Determining Dynamic Brake Requirements

Chapter 2

How to Determine Dynamic Brake Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 11 Determine Values of Equation Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Example Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Evaluating the PowerFlex 7-Class Internal Resistor

Chapter 3

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

Selecting An External Resistor for PowerFlex 7-Class Drives

Chapter 4

How to Select an External Dynamic Brake Resistor for PowerFlex 7-Class Drives 33

Appendix A

Minimum Dynamic Brake Resistance PowerFlex Compact-class Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

PowerFlex Architecture-class Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Rockwell Automation Publication PFLEX-AT001M-EN-P - October 2022

3

Table of Contents

Notes:

4

Rockwell Automation Publication PFLEX-AT001M-EN-P - October 2022

Read the General Precautions

Preface

Waste Electrical and Electronic Equipment Product Safety

Personal Safety

At the end of its life, this equipment should be collected separately from any unsorted municipal waste.

ATTENTION: This drive contains ESD (Electrostatic Discharge) sensitive parts and assemblies. Static control precautions are required when you install, test, service, or repair this assembly. Component damage can result if ESD control procedures are not followed. If you are not familiar with static control procedures, reference any applicable ESD protection handbook.

ATTENTION: To avoid an electric shock hazard, verify that the voltage on the bus capacitors has discharged completely before servicing.

ATTENTION: Measure the DC bus voltage at the power terminal block by measuring between the +DC and -DC terminals or between the +DC and DC test point sockets if equipped. Also measure between the +DC terminal or test point and the chassis, and between the -DC terminal or test point and the chassis. The voltage must be zero for all three measurements.

1

L1 L2 L3

2

I

0V

DC+ DC-

0V

O

Additional Resources

You can view or download publications at . To place an order for paper copies of technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation? sales representative.

Rockwell Automation Publication PFLEX-AT001M-EN-P - October 2022

5

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download