825 User Manual

7/22/2019 825 User Manual

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Modular ProtectionSystem for Motors

Bulletin 825-P

User Manual


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Important User Information Because of the variety of uses for the products described in this publication,those responsible for the application and use of this control equipment mustsatisfy themselves that all necessary steps have been taken to assure that eachapplication and use meets all performance and safety requirements, includingany applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in thisguide are intended solely for purposes of example. Since there are manyvariables and requirements associated with any particular installation, RockwellAutomation does not assume responsibility or liability (to include intellectualproperty liability) for actual use based upon the examples shown in thispublication.

Rockwell Automation publication SGI-1.1, Safety Guidelines for the Application,Installation and Maintenance of Solid-State Control(available from your localAllen-Bradley distributor), describes some important differences betweensolid-state equipment and electromechanical devices that should be taken intoconsideration when applying products such as those described in thispublication.

Reproduction of the contents of this copyrighted publication, in whole or part,without written permission of Rockwell Automation, is prohibited.

Throughout this manual we use notes to make you aware of safetyconsiderations:

Attention statements help you to:

Identify a hazard

Avoid a hazard

Recognize the consequences

Trademark ListDeviceNet and the DeviceNet logo are trademarks of the Open Device Vendors Association (ODVA).Microsoft Windows is a registered trademark of the Microsoft Corporation.

ATTENTION

!

Identifies information about practices or circumstancesthat can lead to personal injury or death, property damageor economic loss.

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


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European Communities (EC)Directive Compliance

If this product has the CE mark it is approved for installation within theEuropean Union and EEA regions. It has been designed and tested to meetthe following directives.

EMC Directive

This product is tested to meet the Council Directive 89/336/EECElectromagnetic Compatibility (EMC) by applying the following standards, in

whole:

EN 60947-4-1 Low-Voltage Switchgear and Controlgear: Part 4:Contactors and Motor Starters - Section 1: ElectromechanicalContactors and Motor Starters

EN 60947-5-1 Low-Voltage Switchgear and Controlgear: Part 5:Control Circuit Devices and Switching Elements - Section 1:Electromechanical Control Circuit Devices

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage asamended by 93/68/EEC by applying the safety requirements ofEN 60947-4-1 and EN 60947-5-1. For specific information required byEN 60947-4-1 and EN 60947-5-1, see the appropriate sections in thispublication.

Notice

This product has been designed for environment A. Use of this product inenvironment B can cause unwanted elctromagnetic disturbances in whichcase the user could be required to take adequate mitigation measures.


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Publication 825-UM004C-EN-P May 2004

Table of Contents i

PrefaceManual Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Typographic Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2

Chapter 1: IntroductionOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Standard Protection Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Optional Protection Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Monitoring Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Chapter 2: InstallationRelay Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Physical Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Relay Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Rear-Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Rear-Panel Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Top-Panel Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5I/O Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

AC/Control Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7Fail-Safe/Non-Fail-Safe Tripping . . . . . . . . . . . . . . . . . . . . . . . . . 2-7Converter Module Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9Core Balance Current Transformer Connections . . . . . . . . . . . . 2-10Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11Across the Line Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12Star-Delta Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14Two-Speed Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Field Serviceability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18Fuse Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19Real-Time Clock Battery Replacement . . . . . . . . . . . . . . . . . . . . 2-20

Chapter 3: Front-Panel OperationFront-Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Normal Front-Panel Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Front-Panel Automatic Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Front-Panel Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Alarm or Warning Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Lockout Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5


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Front-Panel Menus and Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Front-Panel Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Front-Panel Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Main Menu > Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10Main Menu > Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11Main Menu > Motor Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12Main Menu > Targets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13Main Menu > Set/Show. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14Main Menu > Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17Main Menu > Reset Thermal Capacity . . . . . . . . . . . . . . . . . . . . 3-18Main Menu > Reboot/Restore . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

View or Change Settings Using the Front Panel . . . . . . . . . . . . . . . . 3-20Setting Entry Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Chapter 4: ASCII Serial CommunicationsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1ASCII Serial Port Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Connect Your PC to the Relay. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Configure Your Terminal Emulation Software . . . . . . . . . . . . . . 4-3

Serial Port Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Using Terminal Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Serial Port Access Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5Command Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Description of Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7ACC and 2AC (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7ANALOG (Level 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7DATE (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8METER (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8MOTOR (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11PASSWORD (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11QUIT (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12SER (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12SET (Level 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13SHOW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14STATUS (Level 1 or 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16STOP (Level 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18STR (Level 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18SUMMARY (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19TARGET (Level 1 or 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19TIME (Level 1 or 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

View or Change Settings With Front-Panel Serial Port . . . . . . . . . . 4-23View Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23Enter Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24


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Table of Contents iii

Chapter 5: Protection and Logic FunctionsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2Main Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Identifier Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3Phase Rotation, Nominal Frequency Settings . . . . . . . . . . . . . . . . 5-3Current Transformer (CT) Configuration,Full Load Current Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4Voltage Transformer (VT) Configuration Settings . . . . . . . . . . . . 5-5

Basic Motor Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6Overload (Thermal Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6Short Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

Ground Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12Jam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14Undercurrent (Load Loss) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

Current Imbalance/Phase Loss . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15Protection Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16Start Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16Start Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18Phase Reversal Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18Speed Switch (Stalling During Start) . . . . . . . . . . . . . . . . . . . . . . 5-19Thermistor (PTC) Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

RTD-Based Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21RTD Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

Voltage-Based Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24Undervoltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Overvoltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24VAR Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25Underpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25Power Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26Load Control Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27

I/O Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28Trip Inhibit (Block) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29Output Relay Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30Timer Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-31

Front-Panel Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32Display Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32I/O Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-33

Logic Explanation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38Stop/Trip Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38Initiate Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38Unlatch Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-38Start and Emergency Restart Logic . . . . . . . . . . . . . . . . . . . . . . . 5-39


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Chapter 6: Metering and MonitoringOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Metering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Instantaneous Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Thermal Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2Power Measurement Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3Motor Operating Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Chapter 7: Analyzing EventsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1Event Summary Reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Report Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Retrieving Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Resetting the Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Serialized Events Recording (SER) Report . . . . . . . . . . . . . . . . . . . . . 7-2

SER Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2Retrieving SER Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3Resetting the SER Report Buffer. . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Example Reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4Event Summary Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4Serialized Events Recording (SER) Report . . . . . . . . . . . . . . . . . . 7-5

Chapter 8: Testing and TroubleshootingOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Commissioning Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1Selected Functional Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7Periodic Tests (Routine Maintenance). . . . . . . . . . . . . . . . . . . . . 8-12

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15

Appendix A: SpecificationsElectrical Ratings: Main Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1Electrical Ratings: Control Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . A-2Mechanical Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3RTD Scanner Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4Electromagnetic Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Metering Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6Primary Current Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6825-CBCT Core Balance Current Transformer. . . . . . . . . . . . . . . . . A-7


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Appendix B: Firmware Upgrade InstructionsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1Upgrade Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Appendix C: Relay Word BitsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4

Appendix D: ASCII Port Relay Command Summary

Appendix E: 825-P Settings RecordSET Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2SET M Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-13

I/O Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-13SET P Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-21DeviceNet Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-21

Appendix F: Linear Parameter ListOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

Appendix G: Modbus RTU Communications ProtocolOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1Modbus Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Modbus Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-2Supported Modbus Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . G-2Modbus Exception Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-3Cyclical Redundancy Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-303h Read Holding Register Command . . . . . . . . . . . . . . . . . . . . . . . G-406h Preset Single Register Command . . . . . . . . . . . . . . . . . . . . . . . . G-510h Preset Multiple Registers Command. . . . . . . . . . . . . . . . . . . . . . G-660h Read Parameter Information Command . . . . . . . . . . . . . . . . . . G-761h Read Parameter Text Command. . . . . . . . . . . . . . . . . . . . . . . . . G-962h Read Enumeration Text Command . . . . . . . . . . . . . . . . . . . . . G-107Dh Encapsulated Packet With Control Command. . . . . . . . . . . . G-11

7Eh NOP Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12Modbus Password Control and Parameter Modification . . . . . . . . G-12Modbus Serialized Events Recording Register Operation . . . . . . . G-13Modbus Load Profile Register Operation . . . . . . . . . . . . . . . . . . . . G-13


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vi Table of Contents


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Preface

Manual Overview The 825-P Relay User Manual describes common aspects of motor relayapplication and use. It includes the necessary information to install, set,test, and operate the relay and more detailed information about settingsand commands. The chapter descriptions are as follows:

PrefaceDescribes the manual organization and conventions used topresent information.

Chapter 1: IntroductionDescribes the basic features and functions of the 825-P.

Chapter 2: InstallationDescribes how to mount and wire the 825-P; illustrates wiringconnections for various applications.

Chapter 3: Front-Panel OperationExplains features and use of the front panel, including front-panelcommand menu, default displays, and automatic messages.

Chapter 4: ASCII Serial CommunicationsDescribes how to connect the 825-P to a PC for communication;shows serial port pinouts; lists and defines serial port commands.

Chapter 5: Protection and Logic FunctionsDescribes the operating characteristic of each protection elementand explains how to calculate their settings; describes contactoutput logic.

Chapter 6: Metering and MonitoringDescribes the operation of each metering function; describes themonitoring functions.

Chapter 7: Analyzing EventsDescribes front-panel LED operation, trip-type front-panelmessages, event summary data, standard event reports, andSerialized Events Recording (SER) report.

Chapter 8: Testing and TroubleshootingDescribes protection element test procedures, relay self-test, andrelay troubleshooting.

Appendix A: SpecificationsProvides detailed specification and certification information forall components of the 825-P Modular Protection System.

Appendix B: Firmware Upgrade InstructionsProvides detailed specification and certification information forall components of the 825-P Modular Motor Protection Relay.

Appendix C: Relay Word BitsLists and describes the Relay Word bits (e.g., real-time status ofrelay I/O, protection functions).

Appendix D: ASCII Port Relay Command SummaryBriefly describes the serial port commands that are fully describedin Chapter 4: ASCII Serial Communications.


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P-2 Preface

Appendix E: 825-P Settings RecordProvides the setting sheets that include the definition and input rangefor each setting in the relay. Space is provided for recording settingvalues for future reference.

Appendix F: Linear Parameter ListThis appendix lists all accessible parameters of the 825-P relay innumerical order. The setting range for each parameter is provided toassist, especially for applications where you want to set values from alogic controller via a network connection.

Appendix G: Modbus RTU Communications ProtocolThis appendix describes the communications features supported by the

825-P Modbus RTU option card.

Conventions Typographic Conventions

The primary ways to configure the 825-P are:

Using a command line interface on a PC terminal emulation window,

such as Microsoft HyperTerminal.

Using the front-panel menus and push buttons.

The instructions in this manual indicate these options with specific font andformatting attributes.

Examples

This instruction manual uses several example illustrations and instructions toexplain how to effectively operate the 825-P. These examples are fordemonstration purposes only; the firmware identification information orsettings values included in these examples may not necessarily match those inthe current version of your 825-P.

Example Description

STATUS Commands typed at a command line interface on a PC.

Enter Single keystroke on a PC keyboard.Ctrl+D Multiple/combination keystroke on a PC keyboard.

Start > Settings PC dialog boxes and menu selections.The > character indicates submenus.

CLOSE Relay front-panel push buttons.

ENABLE Relay front-panel or rear-panel labels.

MAIN > METER Relay front-panel LCD menus and relay responses.The > character indicates submenus.


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Chapter1

Introduction

Overview The 825-P Motor Relay is designed to protect three-phase motors. Thebasic relay provides locked rotor, overload, unbalance, and short circuitprotection. Voltage-based and RTD-based protection is available as anoption. All relay models provide monitoring functions.

This manual contains the information for installing, setting, testing,operating, and maintaining an 825-P. It is not necessary to review theentire manual to perform specific tasks.

A Quick Start guide, Publication 825-QS001_-EN-P is also available. Itwill help to step the first-time user through the device commissioningprocess.

Features Standard Protection Features

Thermal Overload (thermal model)

PTC (positive temperature coefficient) Overtemperature

Undercurrent (Load Loss)

Current Imbalance and Phase Loss

Overcurrent (Load Jam)

Short Circuit

Ground Fault

Ground Fault (uses core balance CT)

Motor Starting/Running

Protection Inhibit During Start

Start Motor Timer

Notching or Jogging Device TCU (Thermal Capacity Utilization) Start Inhibit

Anti-Backspin Timer

Emergency Start

Two Speed Protection

Reduced Voltage Starting (Star-Delta)

StallSpeed Switch

Frequency


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1-2 Introduction

Optional Protection Features

Voltage-Based Protection

Undervoltage Overvoltage

Underpower

Reactive Overpower

Phase Reversal

Power Factor

RTD-Based Protection

Up to 12 RTDs can be monitored when an external 825-PR12D RTD Scanner

is used. There are separate trip and warn settings for each RTD.

Monitoring Features

The monitoring features of the 825-P are as follows:

Event summaries that contain relay ID, date and time, trip cause, andcurrent/voltage magnitudes. The last five trip causes are saved innonvolatile memory.

Serialized Events Recording (SER). Motor running time since the last reset.

Start cycles since the last reset.

Emergency start cycles since the last reset.

A complete suite of accurate metering functions.

Options and Accessories Options

The 825-P has the following options:

Voltage Option: four-wire wye or open-delta connected VTs.

Input/Output (I/O) Option: one 420 mA analog (transducer) output,three additional control inputs, and four additional contact outputs.

Network Communications options.


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Introduction 1-3

Accessories

Phase current inputs require one of the following external 825-MCMconverter modules:

A separate zero-sequence current input requires an external 825-CBCT CoreBalance Current Transformer, or equivalent.

The following devices are required to add RTD protection:

An external 825-PR12D RTD.

A simplex 62.5/125 m fiber-optic cable with ST connector forconnecting the external RTD module to the 825-P.

Applications Chapter 2: Installation includes AC and DC connection diagrams for variousapplications. The following are possible scenarios:

With or without phase current transformers

With or without zero-sequence core balance current transformer

With or without external RTD module

Across the line starting

Star-delta starting

Two-speed motors

Figure 1.1 shows across the line starting AC connections for the case whereexternal current transformers are not required. Refer to Chapter 2: Installationfor additional applications and the related connection diagrams.

Table 1.1 Converter Module List

Cat. No. Description

825-MCM2 0.52.5 A Converter Module




825-MCM630N 160.0630.0 A Converter Module


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Chapter2

Installation

Relay Placement Proper placement of the 825-P Motor Relay helps make certain that youreceive years of trouble-free motor protection. Use the followingguidelines for proper physical installation of the 825-P.

Physical Location

You can mount the 825-P in a sheltered indoor environment (a buildingor an enclosed cabinet) that does not exceed the temperature andhumidity ratings for the relay. The relay can be mounted indoors or in anoutdoor (extended) enclosure where the relay is protected againstexposure to direct sunlight, precipitation, and full wind pressure, butneither temperature nor humidity are controlled.

Refer to Appendix A: Specifications for environmental ratings.


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2-2 Installation

Relay Mounting

To flush mount the 825-P in a panel, cut a rectangular hole with thedimensions shown in Figure 2.1.

Figure 2.1 Relay Mounted In a Panel

20.8(0.82)

147.4(5.80)

Legendmm(in)

192.0(7.56)

186.0(7.32)

138.0(5.43)

144.0

(5.67)

Mounting Panelmaximum thickness 6.5 mm #8 x 1/2 inch mounting screw;

Torque specification = 0.9...1.3 N.m (8...12 Lb-in) Gasket


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Installation 2-3

Rear-Panel Connections Rear-Panel Diagram

The physical layout of the connectors on the rear-panel of a fully configured825-P is shown in Figure 2.2.

Figure 2.2 Rear-Panel Layout


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2-4 Installation

Top-Panel Diagram

The input and output designations for the rear-panel connectors of a fullyconfigured 825-P are shown in Figure 2.3. This diagram is located on the top

panel of the relay.

Figure 2.3 Top-Panel Input and Output Designations


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Installation 2-5

Power Connections

The power terminals on the rear panel (A1+ and A2-) must connect to110240V AC or 110250V DC. For complete power input specifications,

see Appendix A: Specifications.

The power terminals are isolated from chassis ground. Use 16 AWG

(1.5 mm2) size or heavier wire to connect to the POWER terminals.Connection to external power must comply with IEC 947-1 and IEC 947-3.

Place an external switch, circuit breaker, or overcurrent device in the powerleads for the 825-P; this device must interrupt both the hot (H) and neutral(N) power leads. The maximum current rating for the power disconnect circuitbreaker or overcurrent device (fuse) must be 20 A. Be sure to locate this devicewithin 3.0 m (9.8 ft.) of the relay.

Operational power is internally fused by power supply fuse. See FieldServiceability on page 2-18 for details. Be sure to use fuses that comply withIEC 127-2.


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Installation 2-9

Converter Module Connection

Figure 2.7 Converter Module Connection

Note:The 825-P relay is not EMC-tested for converter module connectingcable lengths greater than the 4-meter cable that is supplied.

Figure 2.8 Converter Module Dimensions

MCM

4-meter cable is supplied

with MCM converter module

d3b b

2

e2 e2

d2

a

c1

c

e

d1

d

b1

e3

Cat. No. 825-MCM2...825-MCM180 Cat. No. 825-MCM420

Cat. No. 825-MCM630N


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2-10 Installation

Core Balance Current Transformer Connections

Figure 2.9 Core Balance Current Transformer Connections

Figure 2.10 825-CBCT Dimensions

825-CBCT GroundFault Sensor (or

customer-suppliedequivalent)

Cat. No. 825-CBCT


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2-12 Installation

Across the Line Starting

Figure 2.12 AC Connections Without CTs

Figure 2.13 AC Connections With Core Balance CT

825-P825-MCM

L3L2L1A1

1 3 5

642

A2

M3 ~

U1 Converter Module

Cat. No. 825-MCM2Cat. No. 825-MCM20Cat. No. 825-MCM180Cat. No. 825-MCM630Cat. No. 825-MCM630N

825-P825-MCM Converter Module825-MCM2825-MCM20825-MCM180825-MCM630825-MCM630N

T2 core balance transformerCurrent ratio of core

balance current transformerOutput from core

balance current transformer

1...2000:1

0...500 mA

L3L2L1

T2

S1 S2

1 3 5

642

M3 ~


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30/232


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2-16 Installation

Two-Speed Motor

Figure 2.18 AC connections for a Two-Speed Motor

The two-speed motor applications in Figure 2.18 and Figure 2.19 require thefollowing input setting:

IN1 = 0 0 0 0 0 0 0 1 0 0 (SPEED2)

1 3 5L N

Y12 Y1

642

(II)(I)

825-P

825-P

825-MCM

24 V AC/V DC

M3 ~


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Installation 2-17

Figure 2.19 AC Connections for a Two-Speed Motor With Primary CTs

825-P

825-P

825-MCM

L3L2L1

K1

I

(I) (II) K1

Y1 Y12

II

... A / 1 (5) A ... A / 1 (5) A

K2

K2

M3 ~

L3 L NL2L1

24 V AC/V DC


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35/232


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2-20 Installation

Real-Time Clock Battery Replacement

To replace the real-time clock battery, do the following:

1. De-energize the relay.

2. Remove the eight rear-panel screws, the ground screw, and the relayrear-panel.

3. Remove the Slot B printed circuit board.

4. Locate the battery clip (holder) on the board.

5. Remove the battery from beneath the clip.

6. Properly dispose of the old battery.

7. Install the new battery with the positive (+) side facing up.

8. Insert the printed circuit board into Slot B.

9. Reinstall the relay rear-panel and ground screw, and then energize therelay.

10. Set the relay date and time.


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Chapter3

Front-Panel Operation

Front-Panel Layout The 825-P Relay front-panel interface consists of two LEDs, an LCDdisplay, a seven-button keypad, and an EIA-232 serial port connector.The front-panel layout is shown in Figure 3.1.

Figure 3.1 Relay Front Panel

Normal Front-Panel Display In normal operation, the relay ENABLE LED is illuminated and theLCD display screen is on. The LCD screen rotates displays showingeach screen for about two seconds before moving to the next. Thedefault rotating display screens include Unit ID Line 1, Unit ID Line 2,line currents, and voltages (if available). Enable the relay to add displaymessages as noted in the Display Enable settings in Table 5.35.

ENABLE LEDLit when relayis operational.

TRIP LEDFlashes to indicatealarm conditions;steady on toindicate trip.

TEST/RESET PushbuttonReset the TRIP or

TRIP TEST the relay.

Arrow PushbuttonsFacilitate navigation

left, right, up, and down.

EIA-232 Serial PortQuick access to all relay data,

control, and setting functions usinga PC, serial cable, and software.

Front-PanelPushbuttons

Control the front-panel display.

LCD DisplayDisplays real time and

historic information;relay settings menus.

{Enter} Pushbutton


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3-2 Front-Panel Operation

Figure 3.2 Default Display Screen

Use the UNIT ID LINE 1 (RID) and UNIT ID LINE 2 (TID) settingsdescribed in Identifier Settings on page 5-3 to change the contents of theinformation shown in Figure 3.2.

If the front panel was in Access Level 2, it automatically returns to the defaultdisplay when the display times out. For more information, see Table 5.34.

The display changes for the following relay conditions in the order ofprecedence (see Table 3.1):

Status failure

Trip condition time to trip (if under 10000 seconds)

Warning Lockout start request

Emergency start in progress

Front-Panel AutomaticMessages

The relay displays automatic messages under the conditions described inTable 3.1.

Front-Panel Messages

Each time the relay trips, it automatically displays a front-panel message andthe Trip LED illuminates. If a trip occurs during a critical alarm statuscondition, the Trip LED flashes (see Self-Tests on page 8-11).

825-P Modular

Prot. System

Table 3.1 Front-Panel Automatic Messages

Condition Front-Panel Message

Relay detecting any failure Displays the type of latest failure (see Testing andTroubleshooting on page 8-1.)

Relay trip has occurred Displays the type or cause of the trip. (See the list ofthe types of Trip messages under the headingFront-Panel Messages on page 3-2.

Motor running overload Displays the predicted time to thermal element trip inseconds

Relay alarm condition hasoccurred

Displays the type of alarm (see Alarm or WarningMessages on page 3-3)

When a start is requestedduring a lockout condition

Displays the type of lockout condition (seeLockout Messages on page 3-4)

Control input set to

disable protection

Displays Protect Disabled By Control Input

During emergency start Displays Emergency Start


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Front-Panel Operation 3-3

Trip message

The Trip message describes the type of trip that occurred:

Overload Trip

Locked Rotor Trip Undercurrent Trip

Jam Trip

Current Imbalance Trip

Short Circuit Trip

Ground Fault Trip

Speed Switch Trip

Undervoltage Trip

Overvoltage Trip

Underpower Trip

Power Factor Trip

Reactive Power Trip

Phase Reversal Trip

Underfrequency Trip

Overfrequency Trip

RTD Trip

PTC Trip

Start Time Trip

RTD Fail Trip

PTC Fail Trip Comm Idle Loss Trip

Remote Trip

Comm Fail Trip

Alarm or Warning Messages

Each time the relay is in a warning condition with the Trip LED flashing, thefront-panel displays the corresponding warning message.


40/232



The Warning message describes the type of warning that is occurring:

Overload Warning

Undercurrent Warning

Jam Warning

Current Imbalance Warning

Ground Fault Warning

Short Circuit Warning

Speed Switch Warning

Undervoltage Warning

Overvoltage Warning

Underpower Warning

Power Factor Warning

Reactive Power Warning

Underfrequency Warning Overfrequency Warning

RTD Warning

RTD Failure

MCM/CWE Failure

PTC Failure

Comm. Loss Warning

Comm. Idle Warning

Comm. Fault Warning

The relay automatically displays a thermal time to trip for an impendingthermal overload. See Figure 3.3.

Figure 3.3 Trip Message Sample

Lockout Messages

TCU Lockout

Start/Hr Lockout Min Off Lockout

Restart Lockout

Front-Panel Menus andOperations

The 825-P front panel gives you access to most of the information that therelay measures and stores. You can also use front-panel controls to view ormodify relay settings.

Thermal Trip In

1234 sec


41/232



All of the front-panel functions are accessible using the seven-button keypadand LCD display. Use the keypad, shown in Figure 3.4, to maneuver within thefront-panel menu structure, described in detail throughout the remainder ofthis section. Table 3.2 describes the function of each front-panel push button.

Figure 3.4 Front-Panel Push Buttons

The Test/Reset push button has two functions if it has not been disabled.

Pressing the Test/Reset push button resets the Trip LED and the Trip outputof the relay. If a trip condition is active, the front-panel message displays thefollowing:

Reset Failed

TRIP is active

To test the trip output, press the Test/Reset push button for longer than twoseconds.

The Test/Reset push button is disabled when Disable settings are active (seeTable 5.38).

Table 3.2 Front-Panel Push Button Functions

Push Button Function

UpArrow Move up within a menu or data list.While editing a setting value, increase the value of theunderlined digit.

DownArrow Move down within a menu or data list.While editing a setting value, decrease the value of theunderlined digit.

LeftArrow Move the cursor to the left.While viewing event data, move to data for a newer event.

RightArrow Move the cursor to the right.While viewing Event data, move to the data for an olderevent.

Esc Re-activate the front-panel display back-lighting.Escape from the current menu or display.

Enter Move from the default display to the main menu.Select the menu item at the cursor.Select the displayed setting to edit the setting.

Trip/Reset Trip test the device.Reset the trip.


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Front-Panel Security

Front-Panel Access Levels

The relay front panel typically operates at Access Level 1 and allows any userto view relay measurements and settings. Some activities, such as editingsettings and controlling output contacts, are restricted to those operators whoknow the relay Access Level 2 password when enabled. The factory defaultsetting for the Access Level 2 password is DISABLED, which providesunrestricted access.

In the figures that follow, restricted activities are marked with the padlocksymbol shown in Figure 3.5.

Figure 3.5 Access Level Security Padlock Symbol

Before you can perform a front-panel menu activity that is marked with thepadlock symbol, you must enter the correct Access Level 2 password. Afteryou have correctly entered the password, you can perform other Access Level2 activities without reentering the password.

Access Level 2 Password Entry

When you try to perform an Access Level 2 activity, the relay determineswhether you have entered the correct Access Level 2 password since thefront-panel inactivity timer expired or since the "Reset Access Lvl" commandhas been executed from the Main Menu. If you have not, the relay displays thescreen shown in Figure 3.6 for you to enter the password.


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Figure 3.6 Password Entry Screen

To Enter Password

Perform these steps to enter the correct password to issue an Access Level 2function or to change the Access Level 2 password, as described in Figure 3.23on page 3.16.

1. Press the DownArrow push button twice. A blinking cursor appears inthe first character position of the password and an underline appearsbeneath the character (letter) A in the lower line of the display.

2. Underline the first character of the password by moving through thecharacters shown in Figure 3.6. Use the LeftArrow and RightArrowpush buttons to move the underline to the left and right and theUpArrow and DownArrow push buttons to move to other characterrows.

3. With the correct first character underlined, press the Enter push button.The first character appears in the upper line of the display and theblinking cursor moves one character to the right.

4. Using the arrow push buttons, continue to move within the charactertable and select each of the characters to build the Access Level 2password.

Password=

Del Clr Accept

A B C D E F G H

I J K L M N O P

Q R S T U V W X

Y Z . . . . . .

a b c d e f g h

i j k l m n o p

q r s t u v w x

y z . . . . . .

0 1 2 3 4 5 6 7

8 9 . . . . . .

! " # $ % ^ ' (

) * + , - . / :

; < = > ? @ [ \

] ^ _ ` { | } ~


44/232


45/232



6. Press the Enter push button to accept the password shown in the upperline of the display.

7. If the password is correct, the relay continues the task.

8. Press the Enter push button to continue your task. If the password wasincorrect, the relay displays the message Invalid Password.

9. Press the Enter push button to return to your password entry.

10. Repeat Steps 19 until you enter the correct password.

11. When you have completed changing settings, use the Main Menucommand Reset Access Lvl (described in the next section) to reset theAccess Level to Level 1 so that unauthorized access is prevented. (Theaccess level will remain at Level 2 until the front panel backlight times

out or the Reset Access Lvl command is executed.)

Front-Panel Main Menu All access to information and relay settings through the front panel starts atthe relay main menu. The remainder of this section describes the use of themain and lower level menus.

Main Menu

Note:The LCD display is dark if it is timed out from inactivity. Press any key

to activate the LCD display.

Figure 3.7 Front Panel Main Menu

Press these keysto move within the list.

Press this key to selectan underlined menu item.

CET 5 Modular

Prot. System

LCD Display Main Menu

MAIN

Meter

Events

Motor Monitor

Targets

Set/Show

Status

Reset TCU

Reboot/Restore

Reset Access Lvl


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Main Menu > Meter

Figure 3.8 Main Menu > Meter Function

The Meter menu includes functions to display meter data. Display functions

are Instantaneous and Thermal. When you select a display function, such asInstantaneous in Figure 3.9, the relay displays a list of instantaneous metervalues you can move through using the UpArrow and DownArrow pushbuttons.

The Thermal display function operates similarly to the Instantaneous displayfunction with the applicable thermal values displayed.

Figure 3.9 Meter Menu > Instantaneous Meter Display Functions

Meter

Events

Main Menu Item Meter Values MenuMETER

Instantaneous

Thermal



METER

Instantaneous

Meter Values Menu Item Instantaneous Meter Display

L1 Current

5.4 A

L1 Angle

2.3 deg

L2 Current

6.3 A

Frequency

60.0 Hz



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Main Menu > Events

Figure 3.10 Main Menu > Events Function

Figure 3.11 Events Menu > Display Events Function

Events

Motor Monitor

Main Menu Item Events Display

EVENTS

Display Events

Reset Events



EVENTS

Display Events

Events Menu Item Events Display

03/12/2003

13:48:09.902

Press these keysto move among events.

Press this keyto select an event.

Press this key

to select event data.

03/12/2003

13:48:09.902

Display Events Menu Item Display Events Display

Date

03/12/2003

Time

13:48:09.902

Type

Lockd Rotor Trip

L1 Current

4.1 A

VCA

0 V

Move amongdata for this event.


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Figure 3.12 Events > Reset Events

Main Menu > Motor Monitor

Figure 3.13 Main Menu > Motor Monitor Function

Figure 3.14 Motor Monitor > Use Data Function

Display Events

Reset Events

Events Menu Item Reset Events Display

Reset Evnt Data?

No Yes

To move between Yes and No.Yes: Resets Event Data Buffer;No: Returns to EVENTS Menu.

To select underlined option.

Motor Monitor

Targets

Main Menu Item Motor Monitor Menu

MOTOR MONITOR

Use Data

Reset Statistics



Use Data

Reset Statistics

Motor Monitor Menu Item Motor Use Data Function

Last Reset Date

03/24/2003

Last Reset Time

13:28:21

Running Time

0:00:00

Stopped Time

1:03:49

Time Running0.0 %

Number of Starts

0

Emergency Starts

0



49/232



Figure 3.15 Motor Monitor > Reset Statistics Function

Main Menu > Targets

The Target values provide real-time status of relay I/O, protection functions,etc. For detailed descriptions, see Appendix C: Relay Word Bits.

Figure 3.16 Main Menu > Targets Function

Use Data

Reset Statistics

Motor Monitor Menu Item Reset Statistics Function

Reset Stats?

No Yes

To move between Yes and No.Yes: Resets Event Data Buffer;No: Returns to MOTOR MONITOR Menu.

To select underlined option.

Targets

Set/Show

Main Menu Item Targets Function

TARGETS

Row 1=00000000

Row 2=00000000

Row 3=00000010

Row 10=01000000



Row 1=00000000

Row 2=00000000

Targets Menu Item Targets Function

49T

0

LOSSTRIP

0

JAMTRIP

0

50G1T

0

Press these keysto move within thelist of Relay Word targets.

Press this key to returnto the previous menu.


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Main Menu > Set/Show

Figure 3.17 Main Menu > Show/Set Function

Figure 3.18 SET/SHOW > RELAY Function

Figure 3.19 RELAY > Main Settings Function

Set/Show

Status

Main Menu Item Set/Show FunctionSET/SHOW

RELAY

PORT

IO ASSIGN

DATE/TIME

PASSWORD



SET/SHOW

RELAY

Set/Show Menu Item Relay Function

RELAY

Main Settings

Overload Set

Short Ckt Set

Timer Settings

Front Panel Set

Display Enable


Press this key toselect a settingsgroup to set or show.

RELAY

Main Settings

Set/Show Menu Item Main Settings Function

UNIT ID LINE 1

825-P Modular

Unit ID LINE 2

Prot. System

PHASE ROTATION

ABC

XFMR CONNECTION

WYE


Press this keyto select and edit.


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Main Menu > Reset Thermal Capacity

Figure 3.26 Main Menu > Reset Thermal Capacity Function

Main Menu > Reboot/Restore

Figure 3.27 Main Menu > Reboot/Restore Function

Figure 3.28 Reboot/Restore > Reboot Relay Function

Reset TCU

Reboot/Restore

Reset Thermal CapacityMenu Item Reset Thermal CapacityFunction

Reset TCU?

No Yes

To Move between Yes and No.Yes: Resets thermal modeldata and timer;No: Cancels command.Press this key toselect an underlined option.

Reset TCU

Reboot/Restore

Main Menu Item Reset/Restore Function

REBOOT/RESTORE

Reboot Relay

Restore Defaults



Reboot Relay

Restore Defaults

Reset Relay Menu Item Reset Relay Function

Reboot Relay?

No Yes

To move between Yes and No.Yes: Reboots the relay;No: Returns to previous menu.

Press this key to

select an underlined option.


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Record. Use the UpArrowand DownArrow and the LeftArrowandRightArrow push buttons to scroll through the relay settings and view orchange them as required by selecting them and editing them. After viewing orchanging the Relay settings, press the Esc push button until the followingmessage appears:

Select and enter the appropriate command by pressing the Enterpush button.Select Yes to save the settings changes and No to discard the changes.

Note: Each 825-P is shipped with default factory settings. Calculate thesettings for your motor to ensure secure and dependable protection.Document the settings on the 825-P Settings Record before entering newsettings in the relay (see Appendix E: 825-P Settings Record).

Figure 3.31 shows a front-panel menu navigation example for the relay toenter the Phase Rotation (ABC, ACB) setting.

Save Changes?

Yes No


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Figure 3.31 Front-Panel Setting Entry Example

Main Menu

Meter

Events

Motor Monitor

Targets

Set/Show

Status

Reset TCU

Set/Show Menu

RELAY

PORT

IO ASSIGN

DATE/TIME

PASSWORD

RELAY Menu

Main Settings

Overload Set

Front Panel Set

Display Enable

Main Settings Menu

UNIT ID LN 1

UNIT ID LN 2

PH ROTATION

RATED FREQ

LINE VOLTAGE

XFMR CON

PHASEROTATION Menu

PHROT=ABC

Press to move

within the list.

Press to returnto the previous list.

Press to select an

underlined menu item.


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Setting Entry ErrorMessages

As you enter relay settings, the relay checks the setting entered against thesettings own range as published on the relay setting sheet. If an entered settingfalls outside its range, the relay immediately responds with the message Out ofRange and prompts you to reenter the setting.

In addition to the immediate range check, several of the settings haveinterdependency checks with other settings. The relay checks settinginterdependencies after you answer Y to the Saves Settings? prompt, butbefore the settings are stored. If any one of these checks fail, the relay issuesone of the error messages shown in the Table 3.3, and returns you to thesettings list for a correction.

Table 3.3 Setting Interdependency Error Messages

Error Message Setting /Function Correct the Condition

50NnP must be within xx.xx and yy.yy(n= 1 or 2)

Ground FaultCoreBalance

Modify the 50N1P or 50N2P setting to satisfy therequirement shown in the error message.

50PnP must be less than xx.xx(n= 1 or 2)

Short Circuit Modify the 50P1P or 50P2P setting to satisfy therequirement shown in the error message.

CTRn,FLAnSetting Combination Out ofRange(n= 1 or 2)

Main Settings Modify the CTRnor FLAnsetting to satisfy:0.5 (FLAn/CTRn) 2.5 when MCM2 is used2.5 (FLAn/CTRn) 20 when MCM20 is used20 (FLAn/CTRn) 180 when MCM180 is used160 (FLAn/CTRn) 630 when MCM630 is used

LRAnmust be less than: xxx(n= 1 or 2)

Overload Modify the LRA1 or LRA2 setting to satisfy therequirement shown in the error message.

Minimum STOP COOL TIME: xxxx min Overload Modify the COOLTIME setting to satisfy the requirementshown in the error message.

Only one ambient RTD allowed(n= 112)

RTD Modify the RTD location setting (RTDnLOC) to satisfy therequirement shown in the error message.

PTR Setting Out of Range Main Settings Modify VNOM or PTR setting to satisfy:100 (VNOM/PTR) 250

Warning: Duplicate Assignment. Input Mapping Modify INnassignment ensuring that input is notassigned to more than one element.

Warning: Verify 50PnP is lower than MCM/CWE saturation current.Save Changes (Y/N)?(n= 1 or 2)

Short Circuit Answer Y if you are using MCM630N.If you are using MCM630, you must modify the 50P1P or50P2P setting below its saturation current to ensureproper protection.

Warning: Verify LRAnis lower than MCM/

CWE saturation currentSave Changes (Y/N)?(n= 1 or 2)

Overload Answer Y if you are using MCM630N.

If you are using MCM630, you must modify the LRA1 orLRA2 setting below its saturation current to ensure properprotection.


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Chapter4

ASCII Serial Communications

Overview The 825-P Relay has the following communications interfaces: Front-panel HMI interface (see Chapter 3: Front-Panel Operation).

Rear fiber-optic port RTD-RX (for fiber-optic interface to theoptional external 825-PR12D RTD Scanner). This port receives theRTD measurement information from the 825-PR12D RTDScanner. Refer to the 825-PR12D RTD Scanner Instruction

Manual for information on the fiber-optic interface. PORT F communication card slot C for optional DeviceNet and

Modbus network communications.

PORT FFront-panel EIA-232 serial port (supports RockwellAutomation ASCII protocol).

The remainder of this chapter describes the connections and commandsused with the ASCII front-panel EIA-232 serial port.

ASCII Serial PortOperation

Introduction

The serial port interface provides an efficient way to communicate withthe relay using a PC to review and enter the settings, access metering data,review self-test status, retrieve event summaries, and obtain motoroperating statistics reports.

Required Equipment

To connect a PC serial port to the relay front-panel serial port and enterrelay commands, you need the following:

A personal computer equipped with one available EIA-232 serialport.

A standard null-modem communication cable to connect thecomputer serial port to the relay serial port.

Terminal emulation software to control the computer serial port.

The 825-P Relay.

On most personal computers, the connector for the EIA-232 serial portis a 9-pin D subconnector. You can purchase the cable to connect thecomputer port to the relay port from most computer hardware retailers,


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ASCII Serial Communications 4-3

Configure Your Terminal Emulation Software

Personal computers use terminal emulation software to send and interpretreceived characters at the EIA-232 serial port. This software allows you to typeletters and numbers to form commands at the computer keyboard and to seethe characters you type and the relay responses on the computer screen. Toensure the PC communicates correctly with the relay, configure the terminalemulation software connection properties to match the relay serial portconfiguration.

Configure the terminal emulation software to match the default settings shownin Table 4.2. For the best display, use VT-100 terminal emulation. If VT-100 isnot available, WYSE-100 and ANSI terminal emulations also work.

To change the port settings, use the front-panel SET/SHOW > PORT settingsmenu item.

Serial Port Settings The 825-P provides settings that allow you to configure the communicationparameters for the front-panel serial port. The front-panel serial port supportsonly ASCII communications, described in detail in Appendix D: ASCII PortRelay Command Summary.

7 RTS Request to send

8 CTS Clear to send

Table 4.2 825-P Relay Serial Communications Default Settings

Setting Default

Speed (bps) 9600

Data Bits 8

Parity N

Stop Bits 1

Flow Control XON/XOFF(software flow control)

Table 4.1 Pin Functions and Definitions for EIA-232 Serial Port (Port F)

Pin Pin Function Definition

Table 4.3 Front-Panel Serial Port Settings

Setting Prompt Setting Range Factory Default

SPEED 30038400 bps 9600

DATA BITS 7, 8 bits 8

PARITY O, E, N N

STOP BITS 1, 2 bits 1

PORT TIMEOUT 030 min 15

HDWR HANDSHAKING Y, N N


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4-8 ASCII Serial Communications

To set the date (and the date format setting is MDY), type DATE mm/dd/yyyyand then press Enter.

To set the date for a date format setting of YMD, type DATE yyyy/mm/ddandthen press Enter.

To set the date for a date format setting of DMY, type DATE dd/mm/yyyyandthen press Enter.

You can separate the month, day, and year parameters with spaces, commas,slashes, colons, or semicolons.

METER (Level 1 or 2)

The METERcommands provide access to the relay metering data. The relaydivides the displayed information into two groups:

Note:All ASCII command responses in this section are examples only. Your

specific relay has differences based on model number, firmware revisionnumber, and application.

Instantaneous

Thermal and RTD

METER k (Instantaneous Metering)

The METERk command displays instantaneous magnitudes (and angles, ifapplicable) of the measured and calculated analog quantities.

All angles are displayed between 180 and +180 degrees. For delta-connected

PTs, angles are referenced to VAB or L1 and for wye-connected PTs angles arereferenced to VAN or L1.

If the voltage channels are not supported, or VAB < 13V (for delta) orVAN < 13V (for wye), angles are referenced to L1 current.

To view the instantaneous meter values once, use the METERcommand (see

the example in Figure 4.3). To view the meter values k times, use the

METERk command, wherek is a number between 1 and 32767.


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Figure 4.3 METER Command Example

=>>MET

825-P Modular Date: 03/05/2003 Time: 16:44:08.404

Prot. System

L1 L2 L3Current Magnitude (A) 21.2 21.3 21.5

Current Angle (deg) -42.0 -162.5 78.2

Average Current Magnitude (A) 21.3

Motor Load (x Ie) 0.9

GF Current-Core Balance (A) 0.00

GF Current-Core Balance Angle (deg) -76.6

GF Current-Residual (A) 0.0

GF Current-Residual Angle (deg) 72.3

Current Imbalance (%) 1.0

VAN VBN VCN VG

Voltage Magnitude L-N (V) 334 334 334 4

Voltage Angle (deg) 0.0 -119.6 120.8 -116.1

Average Phase (V) 334

Voltage Imbalance (%) 0.0

Real Power (kW) 16

Reactive Power (kVAR) 14

Apparent Power (kVA) 21

Power Factor 0.74 LAG

Frequency (Hz) 60.0

=>>


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When you issue the SET command, the relay presents a list of settings one at atime. Enter a new setting or press Enter to accept the existing setting. Editingkeystrokes are shown in Table 4.8.

The relay checks each entry to ensure that it is within the setting range. If it isnot, an Out of Rangemessage is generated, and the relay prompts you forthe setting again.

When all the settings are entered, the relay displays the new settings and

prompts you for approval to enable them. Type Y and then press Enter toenable the new settings. The relay is disabled for as long as five seconds whileit saves the new settings. The SALARM Relay Word bit is set momentarily andthe ENABLE LED extinguishes while the relay is disabled.

To change a specific setting, enter the command shown in Table 4.9.

SHOW

Use the SHOW command to view relay settings and serial port settings (seeFigure 4.5 on page 4.15).

The SHOW command options are listed in Table 4.10.

Table 4.8 SET Command Editing Keystrokes

Do the Following Results

Press Enter Retains setting and moves to next setting.

Type ^ and then press Enter Returns to previous setting.

Type < and then press Enter Returns to previous setting category.

Type > and then press Enter Moves to the next setting category.

Type END and then pressEnter

Exits editing session, then prompts you to savesettings.

Press Ctrl+ X Aborts editing session without saving changes.

Table 4.9 SET Command Format

SET n s TERSE

Where:

n is left blank to enter relay settings.n is P to enter front serial port settings.

n is M to enter I/O mapping settings.

s is the short parameter name of the specific setting you want to jump to andbegin setting.If sis not entered, the relay starts at the first setting (e.g., enter 50PIP tostart at Short Circuit Trip level setting).(Refer to Appendix E: 825-P Settings Record, to obtain the short parameternames.)

TERSE instructs the relay to skip the settings display after the last setting.Use this parameter to speed up the SET command.If you want to review the settings before saving, do not use the TERSEoption.


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You can append a setting name to each of the commands to specify the firstsetting to display (e.g., SHO 50P1P displays the relay settings starting withsetting 50P1P). The default is the first setting.

The SHOW command displays only the enabled settings. To display all thesettings, including disabled/hidden settings, append anAto the SHOWcommand (e.g., SHOW A).

Table 4.10 SHOW Command Options

Command Description

SHOW Show relay settings.

SHO A Show all relay settings: enabled, disabled/hidden.

SHO P Show serial port settings.SHO M Show I/O mapping settings.


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Figure 4.6 STATUS Command Example=>>STA


Prot. System

FID=825-P-R100-V0-Z001001-D20030225 CID=010C

Identity Code 1522001BCX0X1X1X

SELF TESTS

Current L1 L2 L3 RES CB

Offset: OK OK OK OK OK

Voltage VA VB VC

Offset: OK OK OK

PS_Vdc FPGA GPSB HMI

OK OK Ok Ok

RAM ROM CR_RAM Non_Vol Clk_Bat ClockOK OK OK OK Ok OK

PTC RTD MCM/CWE Voltage I/O_Crd Com_Crd

OK Ok OK OK OK OK

MAC_ID ASA DN_Rate DN_Status

0 0000 0000h 0kbps 0000 0000

Relay Enabled

=>>

Figure 4.7 Identity Code Explanation

Note: Refer to Figure 4.6

X None

A 825-MCM2

B 825-MCM5

C 825-MCM20

D 825-MCM180

E 825-MCM420

F 825-MCM630N

0 None

3 DeviceNet

0 None

1 Installed

0 None

1 Installed

1 5 5 2 0 0 1 B A X 0 X 0 A 0 X

Converter Module Communication Card Expansion I/O Card Voltage Sensing Card


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Figure 4.8 DN_Status Explanation

Note: Refer to Figure 4.6

STATUS R or C (Level 2)

To reset the self-test status and restart the relay, enter the STA Rcommand

from Access Level 2.The relay then restarts (like powering down and then powering up the relay)and all diagnostics are rerun before the relay is enabled.

STOP (Level 2)

The STOP command causes the relay to trip, opening the motor contactor orcircuit breaker and stopping the motor. For more details refer to Chapter 5:Protection and Logic Functions.

STR (Level 2)The STR(START) command initiates a motor start using the relay's internallogic. For more details refer to Chapter 5: Protection and Logic Functions.

SUMMARY (Level 1 or 2)

The SUM n command displays a summary list, in reverse chronological order,of all the archived event summary reports (maximum of five events).

An example event summary report is in Figure 4.9. Each event summaryreport shows the date, time, current magnitudes (primary values) and, if the

relay has the voltage option, voltage magnitudes (primary values). The currentand voltage values are at the trigger instant. The event summary report alsoshows the event type (e.g., OVERLOAD TRIP).

The nparameter with the SUM n command can have a value up to 5 anddefines the number of events requested. Ifn is not specified, then up to five ofthe most recent reports are listed.

For more information on events, refer to Chapter 7: Analyzing Events.

Undefined

I/O Idle

I/O Fault

Explicit Fault

I/O Connection

Explicit Connection

0 0 0 0 0 0 0 0


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Figure 4.9 SUMMARY Command Example=>>SUM 2


Prot. System

Event #: 1 Event: OVERLOAD TRIP

Event Date: 01/29/2003 Event Time: 14:14:01.930

L1 L2 L3 RES CBCURRENT MAG (A) 8.2 8.1 8.2 0.0

0.00

Event #: 2 Event: OVERLOAD TRIP

Event Date: 01/29/2003 Event Time: 14:13:05.931

L1 L2 L3 RES CB

CURRENT MAG (A) 8.2 8.2 8.2 0.0

0.00

=>>

SUMMARY R (Level 1 and 2)

The SUMMARY Rcommand clears all the events in the event buffer.

TARGET (Level 1 or 2)

TheTARGET command displays the status of relay elements whether theyare asserted or de-asserted. The elements are represented as Relay Word bitsand are listed in rows of eight, called Relay Word rows. For additionalinformation on individual Relay Word bits, refer to Appendix C: Relay WordBits.

A Relay Word bit is either at logical 1 (asserted) or at logical 0 (de-asserted).

TheTARcommand options are listed in Table 4.12.

Table 4.12 TARGET Command Options

Commands Descriptions

TAR n k Shows Relay Word Row n (010).k is an optional parameter to specify the number of times (132767) torepeat the Relay Word row display.If k is not specified, the Relay Word row is displayed once.See Table 4.13 for the definition of Row 0.See Table 4.14 for a list of the Relay Word bits in each row (n = 110).

TAR name k Shows the Relay Word bit row containing the Relay Word bit name (e.g.,TAR 50P1T displays Relay Word Row 1).Valid names are shown in Table 4.14.k is an optional parameter to specify the number of times (132767) to

repeat the Relay Word bit row display.If k is not specified, the Relay Word row is displayed once.

Table 4.13 Front-Panel LEDs and the TAR 0 Command

LED Number/State

7 6 5 4 3 2 1 0


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To change a specific setting, enter the command shown in Table 4.18.

Table 4.18 SET Command Format

SET n s TERSE

Where:

n is left blank to enter RELAY settings.

n is P to enter front-panel serial port settings.

n is M to enter I/O mapping settings.

s is the name of the specific setting you want to jump to and beginsetting.If s is not entered, the relay starts at the first setting (e.g., enter 50P1Pto start at Short Circuit Trip level setting).

TERSE instructs the relay to skip the settings display after the last setting.Use this parameter to speed up the SET command.If you want to review the settings before saving, do not use the TERSEoption.


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Chapter5

Protection and Logic Functions

Overview This chapter describes the 825-P Relay settings, including the motorprotection elements and basic functions, control I/O mapping, as well asthe settings that control the communications ports and front-paneldisplays.

Note: Each 825-P is shipped with default factory settings. Calculate thesettings for your motor to ensure secure and dependable protection.

Document and enter the settings using the worksheets provided inAppendix E - 825-P Settings Record.

This chapter includes the following subsections:

Application Data lists information that is required about theprotected motor before calculating the relay settings.

Main Settings lists settings that configure the relay inputs toaccurately measure and interpret the AC current and optionalvoltage input signals.

Basic Motor Protection lists settings for protection elementsincluded in all models of the 825-P, including the thermal element,overcurrent elements, load-loss functions, and load-jam functions.

RTD-Based Protection lists settings associated with the RTDinputs (requires RTD Scanner Module). Skip this subsection if yourapplication does not include RTD measuring.

Voltage-Based Protection (Relays With Voltage Inputs) listssettings associated with the optional AC voltage-based protectionelements. You can skip this subsection if your relay is not equippedwith optional voltage inputs.

I/O Configuration lists settings for the front-panel display control,control inputs/outputs, and analog output for all relay models.

Serial Port Settings lists settings that configure the relay front- and

rear-panel serial ports. DeviceNet Port Settings lists settings that configure the relay

rear-panel DeviceNet port.

Selected Relay Logic Diagrams show selected logic diagrams forprotection, control, and outputs.

When you calculate the protection element settings to protect yourmotor, proceed through the subsections listed earlier. Skip the RTD- andvoltage-based protection subsections if they do not apply to your specificrelay model or installation. As you calculate settings, record them on a


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5-2 Protection and Logic Functions

photocopy of the settings worksheets. (See Appendix E: 825-P Settings Recordfor more information.)

DeviceNet port parameters can only be set at the rear of the relay on theDeviceNet card (see Figure 2.2 and Figure 2.3).

You can enter settings using the front-panel SET RELAY function (seeChapter 3: Front-Panel Operation), the front-panel serial port (see Chapter 4:ASCII Serial Communications), or the rear-panel DeviceNet port.

Application Data It is quicker and easier for you to calculate settings for the 825-P if you collectthe following information before you begin (collect the information for eachspeed for a two-speed motor application):

Specifications of the protected motor, including the following details:

Rated full load current.

Service factor.

Locked rotor current. Maximum locked rotor time with the motor at ambient and/or

operating temperature.

Maximum motor starts per hour, if known.

Minimum time between motor starts, if known.

Additional data regarding the motor application, including the followinginformation:

Minimum no load current or power, if known.

Motor accelerating time. This is the normal time required for themotor to reach full speed.

Maximum time to reach motor full load.Note:This time could be significantly longer than the motoraccelerating time, particularly in pump motor applications where themotor could run at full speed for some time before the pump reachesfull head and full load.

Current transformer primary and secondary ratings and connections, ifused.

System phase rotation and nominal frequency.

Voltage transformer ratios and connections, if used.

Type and location of resistance temperature devices (RTDs), if used.

Expected fault current magnitudes for motor or cable ground andthree-phase faults.


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Protection and Logic Functions 5-3

Main Settings Identifier Settings

All models of the 825-P have the identifier settings described in Table 5.1.

The 825-P prints the Relay and Terminal Identifier strings at the top ofresponses to serial port commands to identify messages from individual relays.

Enter up to 16 characters, including capital letters AZ, numbers 09,periods (.), dashes (-), and spaces. Suggested identifiers include the location,process, circuit, size, or equipment number of the protected motor.

Phase Rotation, Nominal Frequency Settings

The phase rotation setting tells the relay your phase labeling standard. SetPhase Rotation equal to ABC when B-phase current lags A-phase current by

120. Set Phase Rotation equal to ACB when B-phase current leads A-phasecurrent by 120.

Figure 5.1 Phase Rotation Setting

Set the Rated Freq. equal to your system nominal frequency.

The Date Format setting allows you to change the relay date presentationformat to either North American standard (Month/Day/Year), engineeringstandard (Year/Month/Day), or European standard (Day/Month/Year).

Table 5.1 Identifier Settings


UNIT ID LINE 1 16 Characters 825-P Modular

UNIT ID LINE 2 16 Characters Prot. System

Table 5.2 Phase Rotation, Nominal Frequency Settings


PHASE ROTATION ABC, ACB ABC

RATED FREQ. 50, 60 Hz 60

DATE FORMAT MDY, YMD, DMY MDY

B

C

A

C

PHROT = ABC

A

PHROT = ACB

B


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Current Transformer (CT) Configuration, Full Load CurrentSettings

Note the following:

Motor FLA settings are in Primary Amperes.

The allowed setting range is dependent on the MCM module that isconnected to the relay. The MOTOR FLA and PHASE CT RATIOsetting ranges will be a subset of the full ranges shown in Table 5.3.

When Two Speed Enable = Y and a Speed 2 control input is specified,the relay uses CT Ratio-2nd and Motor FLA-2nd for the overloadthermal model.

CTs with a 1 or 5 A rated secondary current can be used with theConverter Module MCM2 or MCM20, respectively. If another MCMmodule is used, the relay automatically sets CT Ratios = 1.

The CT ratio and full load current settings, along with the connected MCMmodule, configure the relay to accurately scale measured values and report theprimary quantities. Calculate the phase and neutral CT ratios by dividing theprimary rating by the secondary rating.

The relay runs interdependency checks on the FLA and CT ratios based uponthe ratings of the MCM module that is connected. If a value is set that violatesthe interdependency rules, then the user will be prompted to adjust settings toeliminate conflicts.

EXAMPLE

Phase CT Ratio Setting Calculation:

Consider an application where Phase CT Rating = 100:5A.

Set the CT Ratio :=100/5 := 20

Voltage Transformer (VT) Configuration Settings

Relays that are not equipped with phase voltage inputs hide these settings anddisable voltage-based protection and metering functions.

Table 5.3 CT Configuration and Full Load Current Settings


PHASE CT RATIO 15000 1

MOTOR FLA (Ie) 0.55000 A 0.5

TWO SPEED ENABLE Y, N N

CT RATIO2nd 15000 1

MOTOR FLA2nd 0.55000 A 0.5

CORE B. CT RATIO 12000 100


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Locked Rotor Starts

Running Overload

Imbalance Current/Negative-Sequence Current Heating

Repeated or Frequent Starting

Note:You can set Run State Time Constant of the thermal overload curve. Ifnot known, set t to Auto; the relay configures the overload curve continuouswith the locked rotor curve.

When overload protection is enabled, the relay configures a thermal curvebased on the motor Full Load Amps, Service Factor, Locked Rotor Amps, HotLocked Rotor Time, and Acceleration Factor settings. See Figure 5.5 forselected settings of Thermal Overload curves.

The relay operates a thermal model with a trip value defined by the relaysettings and a present heat estimate that varies with time and changing motorcurrent. The relay expresses the present motor thermal estimate as a

% Thermal Capacity. When the % Thermal Capacity reaches 100%, the relaytrips. You can see the present % Thermal Capacity value using the relayfront-panel METER > THERMAL function or the serial port METER Tcommand.

If the thermal model is turned off (Overload Enable := N), the thermal modelis disabled, the output of the thermal model is blocked, and the relay reportsthe % Thermal Capacity as 999 as noted in Chapter 6: Metering andMonitoring.

Table 5.5 Overload (Thermal Model) Settings


OVERLOAD ENABLE Y, N Y

OL RESET MODE Man, Auto Man

OL RESET LEVEL 1099%TCU 75

SERVICE FACTOR 1.011.50 1.01

MOTOR LRC 2.512.0 xIe 6.0

LOCKD ROTOR TIME 1.0600.0 s 10.0

ACCEL FACTOR 0.101.50 1.00

RUN STATE TIME K Auto, 12000 min Auto

MOTOR LRC2nd 2.512.0 xIe 6.0

MOTOR LRT2nd 1.0600.0 s 10.0

ACCEL FACT2nd 0.101.50 1.00

RUN ST TC2nd Auto, 12000 min Auto

OL WARN LEVEL Off, 5099%TCU 85

START INH. LEVEL Off, 199%TCU Off

STOP COOL TIME 12200 min 18

OL RTD BIASING Y, N N


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Protection and Logic Functions 5-7

When you enable overload protection, the relay requests information aboutthe protected motor capabilities. Obtain the requested information (except theacceleration factor) from the motor specifications.

The 825-P thermal element always operates in one of two modes: starting andrunning. In starting mode, the thermal element trips in Locked Rotor Time atLocked Rotor Current whether the motor is at ambient or at normal operatingtemperature. In running mode, the thermal element provides overloadprotection by limiting the motor heat energy estimate to a value represented bythe overload settings.

The locked rotor time setting is for a hot motor condition. If only one lockedrotor time is specified for a particular motor, unless the specification statesotherwise, assume the time is the cold locked rotor time. Multiply the coldlocked rotor time by 0.833 to determine a hot locked rotor time that isacceptable for most motors.

Note:When Two Speed Enable = Y and a Speed 2 control input is specified,the relay uses the 2nd FLA-related settings for the overload thermal model.

EXAMPLE

Thermal Element Setting

A 4000V 600 Hp motor is protected using the 825-P Thermal OverloadElement. Motor dat

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