TECH LIBRARY 1 SVPP Supplier Manuals Rockwell 1407-CGCM-DLR.pdf

Combination Generator Control Module Catalog Number 1407-CGCM-DLR

User Manual

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.

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

Allen-Bradley, Rockwell Software, Rockwell Automation, ControlLogix, Logix5000, RSLinx, RSLogix, Studio 5000 Logix Designer, Studio 5000, and Studio 5000 Engineering and Design Environment are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

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.

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).

Table of Contents

Preface Additional Resources

Chapter 1 General Information Introduction

Functions

Chapter 2 Installation Mounting Requirements

Electrical Connections

Chapter 3 CGCM-DLR Unit Operation Inputs and Outputs

Communication Operational Functions

Chapter 4 CGCM-DLR Unit Configuration Introduction

Overview of the Configuration Process Preparation Create a New Module in the ControlLogix Controller Manually Configure a Static IP Address Device Setup

Chapter 5 CGCM-DLR Unit Startup Introduction

Safety Recommended Equipment Recommended Start-up Procedure Document Configuration Parameter and Wiring Changes

Chapter 6 CGCM-DLR Unit Software Interface

Introduction CGCM-DLR Unit User Program Interface CGCM-DLR Unit Data Tables

Chapter 7 Troubleshooting

Appendix A Time Over-current Characteristic Curves

General Curve Specifications Time Over-current Characteristic Curve Graphs Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 3

Table of Contents Appendix B CGCM-DLR Unit Math Models Introduction

Synchronous Machine Terminal Voltage Transducer and Load Compensator Model Voltage Regulator VAR/Power Factor Controller Limiters V/Hz Limiter Soft Start Control Field Current Regulator

Appendix C Additional EtherNet/IP Network Information

EtherNet/IP DLR Application Objects

Appendix D Specifications

Appendix E Detailed CGCM-DLR Unit Tag Descriptions

Generator Parameters and Configuration Status General Excitation Control Modes AVR Mode FCR Mode Power Factor Mode VAR Mode Excitation Control Features Protection Synchronizing Load Sharing Metering Redundancy

Appendix F Configuration Record Worksheet

Generator Information

Appendix G Installing the Add-on Profile Introduction

Download the AOP Perform the Installation

Index 4 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Preface

The information in this manual applies to the 1407-CGCM-DLR module, Series D, Revision A, with host firmware revision 05.25 and EtherNet/IP DLR firmware revision 01.09. The manual notes differences with earlier versions of the product where they occur.

Download firmware, associated files (such as AOP, DTM, and EDS), and access product release notes from the Product Compatibility and Download Center at http://www.rockwellautomation.com/rockwellautomation/support/pcdc.page.

Additional Resources These documents contain additional information concerning related products from Rockwell Automation.

You can view or download publications at http://www.rockwellautomation.com/ literature/. To order paper copies of technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative.

Resource Description

Safety Guidelines for the Application, Installation, and Maintenance of Solid State Controls, publication SGI-1.1

Describes some important differences between solid-state equipment and hard-wired electromechanical devices.

EtherNet/IP Media Planning and Installation Manual ODVA Pub. 148 and EtherNet/IP Network Infrastructure Guidelines ODVA Pub. 35(1)

(1) For ODVA publications, see the ODVA EtherNet/IP library at http://odva.org/Home/ODVATECHNOLOGIES/EtherNetIP/EtherNetIPLibrary/tabid/76/lng/en-US/Default.aspx

Provides installation procedures for the EtherNet/P network.

EtherNet/IP Network Configuration, publication

ENET-UM001

Provides Network configuration procedures for the EtherNet/IP network.

Logix5000™ Controllers Common Procedures, publication 1756-PM001

This publication links to a collection of programming manuals that describe how you can use procedures that are common to all Logix5000™ controller projects.

CGCM-DLR Release Notes, publication 1407-

RN002

Provides information on compatible Studio 5000 Logix Designer® application versions and ControlLogix® controller firmware revisions.

Industrial Automation Wiring and Grounding Guidelines, publication 1770.4.1.

Provides general guidelines for installing a Rockwell Automation® industrial system.

Product Certifications website, http://www.ab.com

Provides declarations of conformity, certificates, and other certification details.

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 5 http://literature.rockwellautomation.com/idc/groups/literature/documents/in/sgi-in001_-en-p.pdf http://literature.rockwellautomation.com/idc/groups/literature/documents/um/enet-um001_-en-p.pdf http://literature.rockwellautomation.com/idc/groups/literature/documents/pm/1756-pm001_-en-e.pdf http://literature.rockwellautomation.com/idc/groups/literature/documents/rn/1407-rn002_-en-p.pdf http://literature.rockwellautomation.com/idc/groups/literature/documents/rn/1407-rn002_-en-p.pdf http://www.literature.rockwellautomation.com/idc/groups/literature/documents/in/1770-in041_-en-p.pdf http://ab.com http://www.rockwellautomation.com/literature/ http://www.rockwellautomation.com/literature/ http://odva.org/Home/ODVATECHNOLOGIES/EtherNetIP/EtherNetIPLibrary/tabid/76/lng/en-US/Default.aspx http://www.rockwellautomation.com/rockwellautomation/support/pcdc.page

Preface Studio 5000 Environment

The Studio 5000® Engineering and Design Environment™ combines engineering and design elements into a common environment. The first element in the Studio 5000® environment is the Logix Designer application. The Logix Designer application is the rebranding of RSLogix™ 5000 software and continues to be the product to program Logix5000 controllers for discrete, process, batch, motion, safety, and drive-based solutions.

The Studio 5000 environment is the foundation for the future of Rockwell Automation® engineering design tools and capabilities. It is the one place for design engineers to develop all elements of their control system.

6 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Chapter 1

General Information

Introduction The Combination Generator Control Module with EtherNet/IP Device Level Ring communication (CGCM-DLR unit) is a microprocessor-based control and protection device. The CGCM-DLR unit is designed to integrate with a Logix family programmable controller to provide generator control, protection, and synchronization functions. Programmability of system parameters, regulation settings, and protective functions enable the CGCM-DLR unit to be used in a wide range of applications.

Functions The following sections outline the functions of the unit.

Generator Regulation and Control Functions

This list contains the generator regulation and control functions:

• Four excitation control modes

• Automatic voltage regulation (AVR)

• Manual or field current regulation (FCR)

• Power factor (PF)

• Reactive power (VAR)

• Soft start voltage buildup with an adjustable ramp in AVR and FCR control modes

• Over-excitation (OEL) and under-excitation (UEL) limiting in AVR, VAR, and PF control modes

• Under-frequency compensation (Volts/Hertz)

• Line drop compensation

• Auto-tracking between operating modes and between redundant

CGCM-DLR units

• Automatic transfer to a back-up CGCM-DLR unit in redundant systems

• Generator paralleling with reactive droop compensation or cross-current

(reactive differential) compensation

• Generator paralleling with real power load sharing

• Synchronizing for one or two circuit breakers Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 7

Chapter 1 General Information Generator Protection Functions

This list contains the generator protection functions:

• Loss of excitation current (40)

• Over-excitation voltage (59F)

• Generator overvoltage (59)

• Generator undervoltage (27)

• Loss of sensing (60FL)

• Loss of permanent magnet generator

(PMG/Excitation power) (27)

• Reverse VAR (40Q)

• Over-frequency (81O)

• Under-frequency (81U)

• Reverse power (32R)

• Rotating diode monitor

• Phase rotation error (47)

• Generator over-current (51)

Metering Functions

This list contains the metering functions:

• Voltage

• Current

• Frequency

• Real Power

• Apparent Power

• Reactive Power

• Power Factor

• Real Energy (kWh)

• Apparent Energy (kVAh)

• Reactive Energy (kVARh)

• Controller Excitation Current and Voltage

• Diode Monitor Ripple Level

• Load Share Error

• Synchronization Parameters 8 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

General Information Chapter 1 Inputs

This list contains the inputs for the CGCM-DLR unit:

• Single-phase or 3-phase true rms generator voltage sensing

• Single-phase dual bus or 3-phase single bus voltage sensing

• 3-phase generator current sensing (1 or 5 A nominal)

• Single-phase cross current loop 1 or 5 A current transformer (CT) input

• Auxiliary ±10V DC input providing remote control of the setpoints

• DC power input

Outputs

This list contains the outputs for the CGCM-DLR unit:

• Pulse-width modulated output power stage that is rated at 15 A

• Discrete redundancy relay output

• Discrete fault output driver

• Load sharing connection for use with the Allen-Bradley® Line

Synchronization Module™ (1402-LSM) or compatible hardware

Communication Interfaces

The CGCM-DLR unit has these three communication ports:

• Redundant EtherNet/IP DLR connector

• RS-232 port for dedicated communication with a redundant CGCM

• RS-232 port for factory configuration and test (not for customer use) Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 9

Chapter 1 General Information Notes:

10 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Chapter 2

Installation

Mounting Requirements This equipment is intended for use in a Pollution Degree 2 Industrial Environment, in overvoltage Category II applications (as defined by IEC publication 60664-1). Because the units contain a heat sink, they must be mounted vertically. Any other mounting angle reduces the heat dissipation capabilities of the units, which can lead to premature failure of critical components. The unit can be mounted anywhere that the ambient temperature does not exceed the rated environmental conditions or clearance requirements.

The clearance requirements for the CGCM-DLR unit are:

• 63.5 mm (2.5 in.) of clearance is required on both sides of the unit when mounted.

• 101.6 mm (4 in.) of clearance is required above and below the unit when mounted.

Overall dimensions for the unit are shown in CGCM-DLR Unit Overall Dimensions on page 12.

WARNING: Explosion Hazard

• Substitution of components can impair suitability for Class I, Division 2.

• Do not replace components or disconnect equipment unless power has been switched off or the area is known to be nonhazardous.

• Do not connect or disconnect components unless power has been switched off or the area is known to be nonhazardous.

• This product must be installed in an enclosure. All cables that are connected to the product must remain in the enclosure or be protected by conduit or other means.

• All wiring must comply with N.E.C. article 501-4(b).

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 11

Chapter 2 Installation Figure 1 - CGCM-DLR Unit Overall Dimensions

00-87, 89-98

88 RESTORE FACTORY

IP ADDRESS

192.168.1.1XY

99 SELECTED PER DHCP

OR USER ENTERED

247.7 (9.75)

355.6 (14.00)

(~14.3)

1/4 - 20 Ground Stud (2 Places)

7.14 (0.281) DIA

Mounting Hole (6 Places)

209.6 (8.25)

25.4 (1.00)

152.4 (6.00)

152.4 (6.00)

228.6 (9.00)9.7

(0.38)

159.0 (6.26)

190.0 (~7.5)

Notes:

1. Weight = 7.7 kg (17 lb)

2. Dimensions are in millimeters (inches)

Ground Studs

DEFAULTS

12 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Installation Chapter 2 Electrical Connections The CGCM-DLR unit connections are dependent on the application and excitation scheme. All inputs or outputs cannot be used in a given installation.

Incorrect wiring can result in damage to the unit.

Connect the CGCM-DLR unit terminals with copper wire rated for a minimum of 600V. General appliance wire that is rated for minimum temperatures of 105 °C (221 °F) is acceptable. All wire must be copper. Select circuit conductors that are based on good design practice.

The wire gauge range that is listed in the Terminal Block Label Description table indicates the physical capabilities of the connector.

The CGCM-DLR unit terminals are on the front, bottom, and right panel of the unit. The nine-pin connector on the bottom of the unit is used for communication between CGCM-DLR units in a redundant system. Suggested torque for terminal screws is 1 N•m (9 lb•in).

See pages 15…32 for typical connection diagrams.

Terminals to be used as landing points for shielded wires are provided on several terminal strips. Shield terminals with the same name are internally connected together but are not connected to protective earth or any internal unit circuitry.

Table 1 - Terminal Block Label Description

Terminal Block Wire Gauge Range

Label Description

TB1 2.6…2.1 mm2

(10…12 AWG)

PMG A Phase A excitation power supply

PMG B Phase B excitation power supply (three phases only)

PMG C Phase C excitation power supply

SHLD1 Shield 1: landing points are tied together but are not connected internally to protective earth or other unit circuitry

SHLD1

TB2 SHLD2 Shield 2: landing points are tied together but are not connected internally to protective earth or other unit circuitry

SHLD2

EXC(-) Excitation output negative

EXC(+) Excitation output positive Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 13

TB3 2.6…2.1 mm2

(10…12 AWG)

ID(+)1 A 1 A cross-current compensation CT input

ID(+)5 A 5 A cross-current compensation CT input

ID(-) Cross-current compensation CT common input

I3(+)1 A 1 A phase C CT input

I3(+)5 A 5 A phase C CT input

I3(-) Phase C CT common input

I2(+)1 A 1 A phase B CT input

I2(+)5 A 5 A phase B CT input

I2(-) Phase B CT common input

I1(+)1 A 1 A phase A CT input

I1(+)5 A 1 A phase A CT input

I1(-) Phase A CT common input

TB4 1.6…1.0 mm2

(14…18 AWG)

BAT(+) 24V DC control power input

BAT(-) 24V DC control power return

FLT Open collector fault output

RD RLY Open collector output for redundancy relay

CH GND Chassis ground

TB5 V Gen A Phase A generator voltage input

V Gen B Phase B generator voltage input

V Gen C Phase C generator voltage input

V Gen N Neutral generator voltage input

TB6 V Bus A Phase A bus voltage input(1)

V Bus B Phase B bus voltage input(1)

V Bus C Phase C bus voltage input

V Bus N Neutral bus voltage input

TB7 1.6…1.0 mm2

(14…18 AWG)

VREF(+) Remote setpoint adjusts input

VREF(-) Remote setpoint adjusts input return

SHLD3 Shield 3 landing points are tied together but are not connected internally to protective earth or other unit circuitry

SHLD3

A-COM Analog common

EX-D(+) Excitation enable input

EX-D(-) Excitation enable return

LS(+) Real power load-sharing input

LS(-) Real power load-sharing return

SHLD4 Shield 4 landing point is not connected internally to protective earth or other unit circuitry

(1) When used in a dual breaker configuration, Bus A voltage input is wired from V Bus A to V Bus N and Bus B is wired from V Bus B to V Bus N.

Table 1 - Terminal Block Label Description

Terminal Block Wire Gauge Range

Label Description 14 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Excitation Power

Excitation power is wired to the PMG terminals, whether connected to the generator output (Shunt Excited) or to a PMG. Connect shunt excited inputs with a voltage transformer (VT).

PMG inputs are on TB1 and are labeled PMG A, PMG B, and PMG C, to illustrate their respective phase relationships. Single-phase excitation power must be connected to terminals PMG A and PMG C. Twisted, shielded cabling is required for the PMG inputs.

See these wiring diagrams for more information.

Figure 2 - Excitation Power Connections, 3-phase PMG

Figure 3 - Excitation Power Connections, Single-phase PMG

Figure 4 - Excitation Power Connections, Single-phase Shunt

TB1

PMG A

PMG B

PMG C

SHL D 1

SHL D 1

PMG

TB1

PMG A

PMG B

PMG C

SHLD 1

SHLD 1

PMG

TB1

PMG A

PMG B

PMG C

SHLD 1

SHLD 1

Fuse

G A C

B

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 15

Figure 5 - Excitation Power Connections, 3-phase Shunt

Figure 6 - Excitation Power Connections, AREP Generator

TB1

PMG A

PMG B

PMG C

SHLD 1

SHLD 1

Fuse

Fuse

G

TIP This diagram is based on a Leroy Somer 300 kW AREP (auxiliary-winding regulation excitation principle) machine. Details can differ on other machines.

16 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Excitation Output

The excitation outputs are on TB2 and are labeled EXC(+) and EXC(-).

Twisted, shielded cabling is required for the excitation outputs.

Figure 7 - Excitation Output Connections, Nonredundant CGCM

When the redundancy function is used, three or four external flyback diodes in series must be placed across the generator field winding.

See the redundancy wiring diagrams on pages 29…30.

Control Power

The 24V DC control power inputs are on TB4 and are labeled BAT(+) and

BAT(-).

Figure 8 - Control Power and Chassis Ground Connections

TB2

Shld2 Shld2

EXC (-)

EXC (+)

Exciter field

Exciter voltage connections

TB4

BAT (+)

BAT(-)

FLT

RD RLY

CH GND

24 VDCControl Power Source

Ground stud (typical)

Ground bus

CGCM

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 17

Chassis Ground

The terminal that is labeled CH GND, on TB4, is the chassis ground. Ground studs are also provided on the lower part of the mounting flanges and are internally connected to the CH GND terminal. Connect chassis ground to earth ground with minimum 2.6 mm2 (10 AWG) copper wire that is attached to either stud on the lower part of either side of the unit. Also connect to the CH GND terminal with 1.6 mm2 (14 AWG) copper wire. When installed in a system with other CGCM-DLR units, use a separate lead to the ground bus from each unit.

AC Voltage and Current Sensing

The CGCM-DLR unit supports generator and bus voltage sensing and generator current sensing.

Generator and Bus Voltage Sensing

CGCM-DLR units accept single-phase or 3-phase generator and bus voltage sensing input with nominal voltages of 120V or 208V AC.

See Terminal Block Label Description on page 13 for possible wiring configurations.

The terminals that are found on TB5 provide connections for generator voltage sensing and are labeled V GEN A, V GEN B, V GEN C, and V GEN N. The terminals that are found on TB6 provide connections for bus voltage sensing and are labeled V BUS A, V BUS B, V BUS C, and V BUS N. The connection examples show typical connections for various generator and bus connection schemes.

The CGCM-DLR unit supports these generator connection schemes:

• Single-phase

• Delta or Two-transformer Open Delta

• Three-wire Wye

• Four-wire Wye

The CGCM-DLR supports these bus connection schemes:

• Single-phase

• Delta or Two-transformer Open Delta

• Three-wire Wye

• Four-wire Wye

• Dual Breaker, Single-phase only 18 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Generator Current Sensing

CGCM-DLR units provide 3-phase AC current sensing with provisions for 1 A and 5 A nominal sensing ranges. The inputs for 3-phase current sensing are on TB3. The ID (+) and ID (-) terminals are used for systems that are connected in a cross-current compensation system.

Voltage and Current Sensing Connection Examples

The following examples depict typical connections of voltage (also called potential) transformer (VTs) and current transformers (CTs) to the CGCM-DLR unit for various bus and generator power system configurations.

These diagrams do not show all connections to the CGCM-DLR unit, nor are they intended to show all possible wiring combinations. For assistance in wiring a CGCM-DLR unit in a power system configuration that is not shown in this manual, contact your local Allen-Bradley Distributor or Rockwell Automation sales representative.

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 19

Figure 9 - Voltage and Current Connection for Two (or three) Transformer Delta Bus and Two (or three) Transformer Delta Generator System

L1 L2 L3

G

CB

TB 3

TB 6

VBus A VBus B VBus C

VBus N

TB 5

A C

Fuse

Optional Ground

Optional Ground

Use of a third potential transformer is optional. The CGCM unit can be connected in either open or closed delta.

Use of a third potential transformer is optional. The CGCM unit can be connected in either open or closed delta.

Fuse

Fuse

Fuse

Fuse

Fuse VGen A VGen B VGen C VGen N

To optional cross-current reactive compensation loop.

Cross-current CT input not required for parallel droop operation.

ID(+) 1A

ID (+) 5A

ID (-)

I3 (+) 1A I3 (+) 5A I3 (-) I2 (+) 1A I2 (+) 5A I2 (-) I1 (+) 1A I1 (+) 5A I1 (-)

Customer Supplied CT Shorting Switch or Test Block 20 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Figure 10 - Voltage and Current Connection for Four-wire Wye Bus and Four-wire Wye Generator System with Grounded Neutral

L1 NL2 L3

CB

N

Fuse

Fuse

Fuse

Fuse

Fuse

Fuse

G A C

B

TB 3

I1 (+) 5A I1 (-)

ID (+) 5A

I3 (+) 5A

I2 (+) 5A I2 (-)

I3 (-)

ID (-)

I1 (+) 1A

I2 (+) 1A

I3 (+) 1A

ID (+) 1A

TB 6

VBus A VBus B VBus C VBus N

TB5

VGen A VGen B VGen C VGen N

To optional cross-current reactive compensation loop.

Customer Supplied CT Shorting Switch or Test Block

Cross-current CT input not required for parallel droop operation.

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 21

Figure 11 - Voltage and Current Connection for Four-wire Wye Bus and Two (or three) Transformer Delta Generator System

L1 NL2 L3

G

CB

A C B

Fus e

Fuse

Fuse

Fuse

Fuse

Fuse

TB3

I1 (+) 5A I1 ( -)

ID (+) 5A

I3 (+) 5A

I2 (+) 5A I2 ( -)

I3 ( -)

ID ( -)

I1 (+) 1A

I2 (+) 1A

I3 (+) 1A

ID (+) 1A

TB 6

VB us A VB us B VB us C

VB us N

TB5

VGen A VGen B VGen C VGen N

Customer Supplied CT Shorting Switch or Test Block

Cross-current CT input not required for parallel droop operations.

To optional cross-current reactive compensation loop.

Optional Ground

Use of a third potential transformer is optional. The CGCM unit can be connected in either open or closed delta.

22 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Figure 12 - Voltage and Current Connection for Two (or three) Transformer Delta Bus and Four-wire Wye Generator System

L1 L2 L3

G

CB

A CB

Fuse

Fuse

Fuse

Fuse

Fuse

Fuse

N

TB3

I1 (+) 5 A I1 (- )

ID (+) 5A

I3 (+) 5 A

I2 (+) 5 A

I3 (- )

ID (- )

I1 (+) 1 A

I2 (+) 1 A

I3 (+) 1 A

ID (+) 1A

TB 6

VBus A VBus B VBus C

VBus N

TB 5

V Gen A VGe n B V Gen C V Gen N

I2 (- )

Optional Ground

To optional cross-current reactive compensation loop.

Customer Supplied CT Shorting Switch or Test Block

Cross-current CT input not required for parallel droop operation.

Use of a third potential transformer is optional. The CGCM unit can be connected

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 23

Figure 13 - Voltage and Current Connection for Three-wire Wye Bus and Four-wire Wye Generator System with Grounded Neutral

L1 L2 L3

CB

N

Fuse

Fuse

Fuse

Fuse

Fuse

Fuse

G A C

B

TB 3

I1 ( +) 5 A I1 ( -)

ID ( +) 5 A

I3 ( +) 5 A

I2 ( +) 5 A I2 ( -)

I3 ( -)

ID (-)

I1 ( +) 1 A

I2 ( +) 1 A

I3 ( +) 1 A

ID ( +) 1 A

TB 6

VBus A VBus B VBus C VBus N

TB5

VGen A VGen B VGen C VGen N

Customer Supplied CT Shorting Switch or Test Block

Cross-current CT input not required for parallel droop operation.

To optional cross-current reactive compensation loop.

24 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Figure 14 - Voltage and Current Connection for Dual Breaker Bus and Two (or three) Transformer Delta Generator System

L1 A L 2A L 3A

CB

Fus e

Fuse

CB

L1 B L 2B L 3B

Fuse

Fuse

Fus e

G

TB 3

I1 (+ ) 5A I1 ( -)

ID (+ ) 5A

I3 (+ ) 5A

I2 (+ ) 5A I2 ( -)

I3 ( -)

ID (-)

I1 (+ ) 1A

I2 (+ ) 1A

I3 (+ ) 1A

ID (+ ) 1A

TB 6

VB us A VB us B VB us C

VBus N

TB 5

VGen A VGen B VGen C VGen N

Optional Ground

To optional cross-current reactive compensation loop.

Cross-current CT input not required for parallel droop operation.

Customer Supplied CT Shorting Switch or Test Block

Use of a third potential transformer is optional. The CGCM unit can be connected

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 25

Figure 15 - Voltage and Current Connection for Dual Breaker Bus and Four-wire Wye Generator System

L1 A L 2A L3 A

CB

Fuse

Fuse

Fuse

Fuse

Fuse

N

CB

L1B L2 B L3B

G

TB 3

I1 (+ ) 5A I1 (- )

ID (+ ) 5 A

I3 (+ ) 5A

I2 (+ ) 5A I2 (- )

I3 (- )

ID (- )

I1 (+ ) 1A

I2 (+ ) 1A

I3 (+ ) 1A

ID (+ ) 1 A

TB 6

VBus A VBus B VBus C VBus N

TB 5

VGen A VGen B VGen C VGen N

A C B

To optional cross-current reactive compensation loop.

Cross-current CT input not required for parallel droop operation.

Customer Supplied CT Shorting Switch or Test

26 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Figure 16 - Voltage and Current Connection for Single Phase Bus and Single-phase Generator System

L1 L2 L3

CB

Fuse

Fuse

TB 6

VBus A VBus B VBus C VBus N

TB 5

VGen A VGen B VGen C VGen N

G A C

B

TB3

I1 (+) 5 A I1 (-)

ID (+ ) 5 A

I3 (+) 5 A

I2 (+) 5 A I2 (-)

I3 (-)

ID ( -)

I1 (+) 1 A

I2 (+) 1 A

I3 (+) 1 A

ID (+ ) 1 A

To optional cross-current reactive compensation loop.

Cross-current CT input not required for parallel droop operation.

Customer Supplied CT Shorting Switch or Test

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 27

Figure 17 - Current Connections for 3-phase Delta Generator with Two CTs

The connections that are shown in this diagram can be used if only two CTs are available in the generator circuit. Two CTs can be used only with a three-wire delta generator. The circuit that is shown in this diagram can be substituted for the CT connections that are shown in Figures 9, 11, 14, and 16.

Auxiliary Input

The auxiliary input is a +/- 10V DC input. The auxiliary input terminals are on TB7 and are labeled VREF(+) and VREF(-). SHLD3 is provided for landing the cable shield. Twisted, shielded cabling is required for the VREF connections.

Remote Excitation Enable Input

The remote excitation enable input is a 24V DC input. The remote excitation enable input terminals are on TB7 and are labeled EX-D(+) and EX-D(-).

Discrete Outputs

There are two types of discrete outputs: Fault relay outputs and redundancy relay outputs.

G

TB 3

I1 (+) 5 A I1 ( -)

I3 (+) 5 A

I2 (+) 5 A I2 ( -)

I3 ( -)

I1 (+) 1 A

I2 (+) 1 A

I3 (+) 1 A

A C B

Customer Supplied CT Shorting Switch or Test

28 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Fault Relay Output

The fault relay output is an open-collector sinking output. The fault relay output terminals are on TB4 and are labeled FLT. The following illustration shows a typical connection.

Figure 18 - Typical Fault Relay Connection

Redundancy Relay Output

The redundancy relay output is an open-collector sinking output. The redundancy relay output terminals are on TB4 and are labeled RD RLY. The following figures illustrate typical redundancy connections.

Figure 19 - Typical Redundancy Voltage-sensing Connection Diagram

TB 6

VBus A VBus B VBus C VBus N

TB6

VBus A VBus B VBus C VBus N

Bus Voltage Connections

TB5

V Gen A V Gen B V Gen C V Gen N

TB 5

VGen A VGen B VGen C VGen N

CGCM 1

CGCM 2

Generator Voltage Connections Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 29

Figure 20 - Typical Redundancy Current-sensing Connection Diagram

Figure 21 - Typical Redundancy Excitation Power Connection Diagram

Figure 22 - Typical Redundancy Relay Connection Diagram

TB 3

I1 (+) 1 A

I1 ( -) I1 (+) 5 A

TB 3

I1 (+) 1A

I1 ( -) I1 (+) 5A

Generator Current

Connections CGCM 1

Typical connection for one current input. Other current inputs (including the cross-current input) should duplicate.

Customer Supplied CT

Shorting Blocks or Test Block

TB1

TB 1

PMG A

PMG B

PMG C

PMG Voltage Connections

Shield Shield

PMG A

PMG B

PMG C

Shield Shield

TB 2

Shld2 Shld2

EXC ( -)

EXC (+)

TB 2

Exciter Voltage Connections

Shld2 Shld2

EXC ( -)

EXC (+)

TB4

TB4

BAT (+)

BAT(-)

FLT

RD RLY

CH GND

BA T (+)

BAT (-)

FLT

RD RLY

CH GND

U ser-provided Relay

Exciter Field

Flyback Diodes (3 - 4)

User-provided Relay 30 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Real-power Load Sharing

The load sharing terminals connect to a 0…5V DC, internally powered circuit.

The load sharing terminals are on TB7 and are labeled LS(+) and LS(-). Terminal SHLD4 is provided to land the cable shield. Twisted, shielded cabling is required for the load sharing connections.

Figure 23 - Real-power Load Sharing

Cross-current Compensation

The Cross-current (reactive differential) Compensation Connection Diagram on page 32 shows a typical connection diagram for three paralleled generators using the 5 A sensing input range on the AC current input.

Make connections with 2.6 mm2 (10 AWG) copper wire for CT inputs.

The resistance of the cross-current CT wiring must be as low as possible. A loop resistance less than 10% of the internal cross -current burden resistance of

1.0 Ω(1) enables cross-current operation with negligible voltage droop. If the CCCT loop resistance must be higher, adjust the CCCT gain or increase the cross-current burden resistance. You can do those things by adding external resistance to each CGCM-DLR unit in the loop.

The cross-current compensation terminals are on TB3 and are labeled ID(-) and ID(+). One and 5 ampere range terminals are provided.

TB7

LS (+)

LS (-)

SHLD 4

TB 7

LS (+)

LS (-)

SHLD 4

TB 7

LS (+)

LS (-)

SHLD4

CGCM 1 CGCM2 CGCM3

Ground shield at only one point.

(1) Series C devices have internal 1 Ω resistor. Earlier devices can require an external resistor.

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 31

Figure 24 - Cross-current (reactive differential) Compensation Connection Diagram

Figure 25 - Typical Cross-current CT Locations and Polarity

ID (+ ) 5A

ID (-)

ID (+ ) 1A

L 1 L2 L3

G

G2

A C B

L1 L2 L3

L1 L2 L3

G

G3

A C B

G

G1

A C B

TB 3

ID (+ ) 5 A

ID ( -)

ID (+ ) 1 A

TB 3

ID (+ ) 5 A

ID ( -)

ID (+ ) 1 A

TB 3

Ground cross-current loop at only one point (optional).

Customer Supplied CT

Shorting Switch or Test Block

(typical)

Cross-current CT

(typical)

L1 L2 L3

G

A CB

X ZY

L1 L2 L3

G A

C B

X Z

Y

ABC Generator ACB Generator

Cross-current CT

(typical) 32 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Communication Connectors and Settings

There are three ports on the unit: the factory calibration port, the redundancy port (COM1), and the EtherNet/IP network port.

Factory Calibration Port

The factory calibration port is not intended for use by anyone other than qualified factory representatives.

Redundancy Port (COM1)

The DB-9 female connector on the bottom side of the CGCM-DLR unit is used for communication with another CGCM-DLR unit when operating in a redundant system configuration. Use a null modem cable for this connection.

See CGCM-DLR Unit Interconnection Cable table for connector pin numbers, functions, names, and signal directions.

The cable pinout is illustrated in the CGCM-DLR Unit Interconnection Cable Diagram.

Figure 26 - CGCM-DLR Unit Interconnection Cable Diagram

Table 2 - CGCM-DLR Unit Interconnection Cable

Pin Name Description Function

1 Not used

2 XMIT Transmit Sends serial data from CGCM-DLR unit

3 RCV Receive Receives serial data from CGCM-DLR unit

4 DTR Data terminal ready Receives a signal that the sending unit is operational

5 GND Ground Provides the ground signal

6 DSR Data-set ready Sends a signal that the CGCM-DLR unit is operational

7, 8, 9 Not used

To CGCM Unit DB-9 Female

To CGCM Unit DB-9 Female Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 33

EtherNet/IP Network Port

Two EtherNet/IP RJ45 connectors are provided on the1407-CGCM-DLR unit.

Use the thumbwheel switches on the front of the CGCM unit to set the EtherNet/IP network IP Address(1). The two thumbwheel switches set the last two digits of the 192.168.1.1xy static IP Address. Thumbwheel switch selection 99 is used for DHCP selection or manual configuration of the IP Address by using Logix Designer. The selection 88 is reserved for initiating an out-of-box reset.

(1) For additional information, refer to EtherNet/IP Media Planning and Installation Manual ODVA Pub. 148 and EtherNet/IP Network Infrasture Guidelines ODVA Pub. 35. ODVA membership is required.

http://odva.org/Home/ODVATECHNOLOGIES/EtherNetIP/EtherNetIPLibrary/tabid/76/lng/en-US/Default.aspx

IMPORTANT The thumbwheel switches are read only when the unit powers up or is reset. After power up, changes to the switch settings do not affect the network configuration of the unit.

00-87, 89-98

88 RESTORE FACTORY

IP ADDRESSSWITCH VALUES

XY = VALUES OF SWITCHES X,Y

192.168.1.1XY

SELECTED PER DHCP

OR USER DEFINED

DEFAULTS

34 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 http://odva.org/Home/ODVATECHNOLOGIES/EtherNetIP/EtherNetIPLibrary/tabid/76/lng/en-US/Default.aspx

Chapter 3

CGCM-DLR Unit Operation

This section provides an operational description of the functions of the CGCM-DLR unit. The CGCM-DLR unit incorporates the following to provide the regulation, synchronizing, and protection functions that are described in this section:

• Hardware inputs and outputs

• Software inputs and outputs to a Logix family programmable controller

• Configuration settings

• Internal control algorithms

For information on how toconfigure the CGCM-DLR unit, see Chapter 4, Configuration.

For further information on the software interface between the CGCM-DLR unit and its host Logix programmable controller, see Chapter 6, CGCM-DLR Unit Software Interface.

The Simplified Block Diagram provides a functional block diagram for the CGCM-DLR unit.

Figure 27 - Simplified Block Diagram Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 35

Chapter 3 CGCM-DLR Unit Operation EtherNet/IP DLR

COM1 Redundancy Port

COM0 Factory Test Port

EXC (-)

EXC (+)

Operating Power

(PMG Inputs)

Chopper

(PWM)

Commun-ication

FLT

RD RLY

LS (+)

LS (-)

Microprocessor

Memory Circuits

Flash Memory RAM EEPROM

VREF (+)

VREF (-)

EX-D (+)

EX-D (-)

Crosscurrent

Generator Line Current Generator Voltage

Bus Voltage

ADC

Watch-dog Timer

Auxiliary Input

Remote Excitation

Enable

Analog Input

Circuits

Digital Signal

Processor

Load Sharing

Open Collector Outputs

Power SupplyControl Power (24V DC)

ADC

DAC

+5 +12 -12 +24 36 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

CGCM-DLR Unit Operation Chapter 3 Inputs and Outputs Figure 28 shows the front panel layout of the CGCM-DLR unit. Input and output connections are made through the terminal blocks TB1…TB7.

Figure 28 - Front Panel Layout

00-87, 89-98

88 RESTORE FACTORY

IP ADDRESS

192.168.1.1XY

99 SELECTED PER DHCP

OR USER ENTERED

DEFAULTS

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 37

Analog Inputs

The CGCM-DLR unit provides a number of analog inputs for use in the regulation and control of standalone and paralleled generator systems. The following sections outline each of the inputs.

Generator Voltage Sensing Inputs

The CGCM-DLR unit senses generator voltage through voltage transformers (VTs) installed across the generator output leads.

The CGCM-DLR unit uses voltages that are measured through the generator voltage sensing inputs for generator voltage, VAR and/or power factor regulation, kW and kVAR load sharing, synchronization, metering, and protection. The inputs accept signals with up to 40% Total Harmonic Distortion (THD) and are connected for single-phase and 3-phase applications. The generator voltage inputs are internally scaled by the CGCM-DLR unit according to its transformer configuration settings.

Generator voltage sensing inputs are labeled V Gen A, V Gen B, V Gen C, and V Gen N.

Bus Voltage Sensing Inputs

Voltages that are measured through the bus voltage sensing inputs are used for generator to bus synchronizing. The CGCM-DLR unit senses bus voltage through VTs. Depending upon the number of busses and the type of synchronizing required, there are one or two sets of bus sensing transformers. If dual bus synchronizing is required, the sensing transformer configuration is limited to single-phase. In a single breaker system, the inputs are connected in either single-phase or 3-phase configurations. The inputs accept signals with up to 40% THD. The bus voltage inputs are internally scaled by the CGCM-DLR unit according to its transformer configuration settings.

Bus voltage sensing inputs are labeled V Bus A, V Bus B, V Bus C, and V Bus N.

Generator Line Current

The CGCM-DLR unit senses generator current through current transformers that are installed on the generator output leads.

Current measured through the line current inputs is used for metering purposes, regulating generator VARs, regulating generator PF, real power load sharing, and for protection purposes. The current measured is required for operation in AVR Droop, PF, and VAR operating modes. Line current inputs are galvanically isolated via CTs internal to the CGCM-DLR unit. The CGCM-DLR unit accepts either 1 A or 5 A current inputs that are wired to the corresponding input. Line current inputs are labeled I1(+)1 A, I1(+)5 A, I1(-), and so forth.

38 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Cross-current

The CGCM-DLR unit senses reactive differential current through properly connected current transformers that are typically installed on the B-phase output leads of each paralleled generator.

See Typical Cross-current CT Locations and Polarity on page 32 for more information.

Line current inputs are galvanically isolated via CTs internal to the CGCM-DLR unit. The CGCM-DLR unit accepts either 1 A or 5 A current inputs. The cross-current input terminals are labeled ID(+)5A, ID(+)1A, and ID(-).

Auxiliary Input

This input is an analog voltage (-10…10V DC), and provides a means to adjust remotely the regulation point of the generator. Resistive isolation is provided by using differential amplifiers.

The auxiliary input terminals are labeled VREF(+) and VREF(-).

Power Inputs

The unit has two types of power inputs: control power inputs and excitation power inputs.

Control Power Input

The CGCM-DLR unit operates from a nominal 24V DC supply that is connected to the control power inputs. The control power input is diode-protected to help protect against equipment damage due to improper polarity of the applied power.

The control power inputs are labeled BAT(+) and BAT(-).

Excitation Power Input

The CGCM-DLR unit accepts either 3-phase or single phase excitation power.

Excitation power can be obtained from the generator or the utility via shunt excitation (SE) or from the generator prime mover via a Permanent Magnet Generator (PMG).

See Chapter 2 for details on connections for SE or PMG operation.

The excitation power input terminals are labeled PMG A, PMG B, and PMG C.

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 39

Discrete Inputs - Remote Excitation Enable

The remote excitation enable input is a 24V DC input. When 24V DC is applied to the input, CGCM-DLR unit excitation is permitted.

The remote excitation enable input terminals are labeled EX-D(+) and EX-D(-).

Analog Outputs

The unit has two types of analog outputs: excitation output and real power load sharing.

Excitation Output

The CGCM-DLR unit Pulse Width Modulated (PWM) power stage provides DC generator exciter field current. The excitation power stage is designed to accommodate up to 125V DC (nominal) field voltages.

See Excitation Control Modes on page 43 for a description of operation.

Care must be taken that the field resistance does not allow more than 15 A DC to flow continuously at rated field voltage.

Minimum resistance for common voltages is given in Appendix D.

The CGCM-DLR unit excitation output is equipped with a high-speed circuit for detecting a shorted output. The excitation output is clamped at a low level when a low impedance connection is detected. The CGCM-DLR unit indicates that the clamp is active by setting Spare2 bit in the Scheduled Read Data Table.

The Spare2 bit indication is reset by either setting the tag SoftwareExcEN = 0 or by cycling the control power to the CGCM-DLR unit.

A loss of EtherNet/IP network communication with the host Logix controller causes the CGCM-DLR unit to automatically shut down generator excitation.

The excitation output terminals are labeled EXC(+) and EXC(-).

IMPORTANT For generator excitation to occur, excitation must be enabled in software, an active EtherNet/IP connection must be present, and a 24V DC signal must be applied to the remote excitation enable input.

40 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Real-power Load Sharing

Real-power load sharing terminals are provided to allow two or more CGCM-DLR units or other compatible generator control devices (such as the Line Synchronization Module™, catalog number 1402-LSM) to load the generators under their control such that the same per unit output is developed by each generator.

Load sharing terminals are labeled LS(+) and LS(-).

Discrete Outputs

The CGCM-DLR unit provides two discrete open collector outputs, the fault output and the redundancy relay output. These outputs are sinking type outputs internally connected to the control power BAT(-) supply. They are intended to drive a user-supplied relay that is connected between the control power BAT(+) supply and the applicable discrete output terminal.

Fault Output

The fault output can be used to annunciate a fault via a user-supplied relay. You can choose, from a predetermined list, the conditions for this output. The fault output is labeled FLT.

The fault enable output tags in the Output table determine which faults activate the fault relay output.

Redundancy Relay Output

The redundancy relay output is used to transfer excitation of the generator from the primary CGCM-DLR unit to the redundant CGCM-DLR unit in dual unit systems. The redundancy relay output is labeled RD RLY.

Communication The CGCM-DLR unit provides three communication ports along with software inputs and outputs.

Com 0 Factory Test Port

Not for customer use. This port is used to calibrate the CGCM-DLR unit during factory testing.

Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 41

Com 1 Redundancy Port

The redundancy port lets one CGCM-DLR unit communicate with its partner CGCM-DLR unit in a redundant system, which lets the partner unit auto-track the primary unit control modes.

EtherNet/IP Network Port

The EtherNet/IP DLR network ports are used to interface with a Logix family programmable logic controller. Through these ports, the Logix Designer application facilitates setting CGCM-DLR unit configuration parameters.

Control, metering, and protection settings are communicated to the CGCM-DLR unit by using these ports. The CGCM-DLR unit firmware is update programmable through these ports.

Software Inputs and Outputs

Your Logix family host programmable controller must include the hardware and communication interfaces with the generator, prime mover, power system, and balance of plant that are not included in the CGCM-DLR unit module. The software interface between the CGCM-DLR unit and its host controller is made via the EtherNet/IP network interface. The specific interface consists of several Assembly Instances, or data tables:

• The Input (Scheduled Read) table provides time-critical status and fault parameters, and control commands, from the CGCM-DLR unit to the host Logix controller.

• The Output (Scheduled Write) table provides time-critical enable commands, selection commands, and setpoints from the host controller to the CGCM-DLR unit.

• The Unscheduled Read table provides non-time critical metering data from the CGCM-DLR unit to the host controller.

• The Unscheduled Write table provides a means to adjust selected gains and energy counter-presets while excitation is enabled.

• The Configuration table contains the basic CGCM-DLR unit configuration parameters. The configuration is automatically transferred from the host controller to the CGCM-DLR unit on powerup and at other times when excitation is not enabled.

See Chapter 6, CGCM-DLR Unit Software Interface, for more detailed information on the CGCM-DLR unit software interface.

42 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Operational Functions The following sections describe the operational functions of the CGCM-DLR unit. The functions include the following:

• Excitation Control Modes

• Limiting Functions

• Protection Functions

• Synchronizing

• Real-power Load Sharing

• Metering

• Redundancy

• Watchdog Timer

Excitation Control Modes

The CGCM-DLR unit controls the DC excitation current of the generator exciter that is based on a number of factors, including the following:

• The selected control mode

• The configuration of the CGCM-DLR unit including gains

• Measured generator voltage and current

• The applicable setpoint or setpoints

• The value of the Auxiliary Input

• Various limiting functions

The CGCM-DLR unit offers several modes of regulation that are selected and activated by using the software interface to the host Logix programmable controller. An active EtherNet/IP Data connection must exist with the host Logix controller for any regulation mode to be active.

The CGCM-DLR unit automatically shuts down excitation if one of these faults occurs:

• Overexcitation voltage

• Reverse VAR

• Logix controller fault Rockwell Automation Publication 1407-UM002A-EN-P - January 2016 43

Gains

The CGCM-DLR unit regulates excitation current by using a proportional, integral, and derivative (PID) control algorithm. Your gain settings determine the regulator response of the CGCM-DLR unit. The gains for each mode include the following:

• Proportional Gain Kp – determines the basic response to changes in generator voltage

• Integral gain Ki – speeds the return to steady state voltage after a disturbance

• Derivative gain Kd – speeds the initial regulator response to a disturbance

• Overall gain Kg – adjusts the coarse loop gain of the regulator

• Auxiliary Gain – adjusts the effect of the auxiliary input on the regulator output

See Chapter 4, CGCM-DLR Unit Configuration, for more detailed information.

Field Current Regulation Mode (FCR)

FCR mode provides manual control of the excitation current. In FCR mode, the CGCM-DLR unit measures and controls its field excitation current output to maintain the commanded field current setpoint. The FCR feedback loop includes adjustable proportional, integral, and derivative gains. In FCR mode, automatic voltage control, reactive power control, power factor control, over-excitation limiting, and under-excitation limiting are disabled. To activate FCR mode:

• The gains must be set.

• FCR mode must be selected (tag AVR_FCR_Select = 1).

• The desired setpoint must be written to the FCRSetpt tag.

• Excitation enabled (tag SoftwareExcEn = 1).

• Remote Excitation Enable On (discrete input).

Automatic Voltage Regulation Mode (AVR)

AVR mode provides automatic control of the excitation current. In AVR mode, the CGCM-DLR unit controls field excitation current output to maintain the commanded generator voltage setpoint. The AVR feedback loop includes adjustable proportional, integral, and derivative gains. To activate AVR mode:

• The metering VTs must be properly connected and configured.

• The AVR gains must be set.

• AVR mode must be selected (tag AVR_FCR_Select = 0).

• The desired setpoint must be written to the AVRSetpt tag.

• Excitation enabled (tag SoftwareExcEn = 1).

• Remote Excitation Enable On (discrete input).

• For constant voltage control, droop must be disabled

(tag V_DroopEn = 0).

44 Rockwell Automation Publication 1407-UM002A-EN-P - January 2016

Droop (reactive current compensation)

Droop (reactive current compensation) is a method of controlling reactive current when a generator is connected in parallel with another energy source.

Droop adjusts the generator voltage in proportion to the measured generator reactive power. The CGCM-DLR unit calculates reactive power by using the 3-phase generator voltage and current…