Rockwell Automation 1407-CGCM User Manual

User Manual

Combination Generator Control Module

Catalog Number 1407-CGCM

Important User Information

IMPORTANT

Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety
Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1
your local Rockwell Automation® sales office or online at http://www.rockwellautomation.com/literature/
important differences between solid-state equipment and hard-wired electromechanical devices. Because of this difference,
and also because of the wide variety of uses for solid-state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment is acceptable.

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.

available from

) describes some

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.

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.

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

Allen-Bradley, Rockwell Software, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.

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

Summary of Changes

This manual contains new and updated information. Changes throughout this
revision are marked by change bars, as shown to the right of this paragraph.

New and Updated Information

This table contains the changes made to this revision.

Topic Page

Updated label on the dimension diagrams 14
Updated wire temperature rating 15
Updated chassis ground wire requirements 20
Added Cross Current Compensation entity parameters to the

Generator Current Sensing table
Added Load Share entity parameters to the Metering table 205
Updated the Zone 2 Certification information in the Agency

Certifications table

198

206

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 3

Summary of Changes

Notes:

4 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Table of Contents

Preface

General Information

Installation

CGCM Unit Operation

CGCM Unit Configuration

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 2

Mounting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 3

Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Operational Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Chapter 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Overview of the Configuration Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Create a New Module in the ControlLogix Controller . . . . . . . . . . . . . . 72

Device Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

CGCM Unit Startup

CGCM Unit Software Interface

Troubleshooting

Time Over-current
Characteristic Curves

Chapter 5

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Recommended Start-up Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Document Configuration Parameter and Wiring Changes. . . . . . . . . . 123

Chapter 6

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

CGCM Unit User Program Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

CGCM Unit Data Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Chapter 7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Appendix A

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Curve Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Time Over-current Characteristic Curve Graphs. . . . . . . . . . . . . . . . . . . 166

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 5

Table of Contents

Appendix B

CGCM Unit Math Models

Additional ControlNet Network
Information

Specifications

Detailed CGCM Unit Tag
Descriptions

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Synchronous Machine Terminal Voltage Transducer and Load

Compensator Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

VAR/Power Factor Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Limiters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

V/Hz Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

Soft Start Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Field Current Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Appendix C

ControlNet Application Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

Appendix D

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Appendix E

Generator Parameters and Configuration Status . . . . . . . . . . . . . . . . . . . 207

General Excitation Control Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

AVR Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

FCR Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Power Factor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

VAR Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

Excitation Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Synchronizing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

Load Sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

Appendix F

Configuration Record

Generator Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

Worksheet
Index

6 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Preface

The information in this manual applies to the 1407-CGCM module, Series C,
Revision D, with host firmware revision 4.9 and ControlNet firmware revision

1.11. The manual notes differences with earlier versions of the product where
they occur.

Additional Resources

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

Resource Description

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

ControlNet Coax Media Planning and
Installation, publication CNET-IN002

Logix5000 Controllers Common Procedures,
publication 1756-PM001

CGCM Release Notes, publication 1407-RN001

Industrial Automation Wiring and Grounding
Guidelines, publication 1770.4.1.

Product Certifications website,

http://www.ab.com

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

Provides installation procedures for the
ControlNet network.

Provides information about RSLogix 5000
software.

Provides information on compatible RSLogix
5000 software versions and ControlLogix
controller firmware revisions.

Provides general guidelines for installing a
Rockwell Automation industrial system.

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

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.

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 7

Preface

Notes:

8 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

General Information

Chapter

1

Introduction

Functions

The Combination Generator Control Module (CGCM unit) is a
microprocessor-based control and protection device. The CGCM 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 unit to be used in a wide range of applications.

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 contr ol modes

• Under-frequency compensation (Volts/Hertz)

• Line drop compensation

• Auto-tracking between operating modes and between redundant CGCM

units

• Automatic transfer to a back-up CGCM 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-UM001G-EN-P - April 2013 9

Chapter 1 General Information

Generator Protection Functions

This list contains the generator protection functions:

• Loss of excitation current (40)

• Over-excitation voltage (59F)

• Generator over-voltage (59)

• Generator under-voltage (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:

• Vo l t a g e

• Current

• Fre que ncy

• Real Power

• Apparent Power

• Reactive Power

• Power Factor

• Real Energy (kWh)

• Apparent Energ y (kVAh)

• Reactive Energy (kVARh)

• Controller Excitation Current and Voltage

• Diode Monitor Ripple Level

• Load Share Error

• Synchronization Parameters

10 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

General Information Chapter 1

Inputs

This list contains the inputs for the CGCM 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 unit:

• Pulse-width modulated output power stage 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 unit has these three communication ports:

• Redundant ControlNet 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-UM001G-EN-P - April 2013 11

Chapter 1 General Information

Notes:

12 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Installation

Chapter

2

Mounting Requirements

This equipment is intended for use in a Pollution Degree 2 Industrial
Environment, in over-voltage 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, possibly leading 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 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 Unit Overall Dimensions

on page 14.

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 non-hazardous.

• Do not connect or disconnect components unless power has been switched off or the

area is known to be non-hazardous.

• This product must be installed in an enclosure. All cables 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-UM001G-EN-P - April 2013 13

CNA

CNB

Manufactured by

aB

R

BAT (-)

BAT (+)

DANGER

elrle Es ricc

4

5

ID (+) 1A

ID (+) 5A

ID (-)

I3 (+) 1A

I3 (+) 5A

I3 (-)

I2 (+) 1A

I2 (+) 5A

I2 (-)

I1 (+) 1A
I1 (+) 5A

I1 (-)

TB5

TB6

TB3

SHLD 2

SHLD 2

EXC (+)

EXC (-)

TB2

Combination
Generator
Control Module

TB4

FLT
RD RLY
CH GND

TB7

ControlNet
Address

TB1

PMG A

PMG B

PMG C
SHLD 1

SHLD 1

V Bus A
V Bus B
V Bus C
V Bus N

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

VREF (+)
VREF (-)
SHLD 3
SHLD 3

A-COM
EX-D (+)
EX-D (-)

LS (+)
LS (-)

SHLD 4

Factory
Test
Port

247.7
(9.75)

355.6
(14.00)

363
(~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

HAZARDOUS VOLTAGE CAN CAUSE SHOCK, BURNS, OR DEATH.

1) DISCONNECT AND LOCK OUT ALL POWER SOURCES AND,

2) SHORT ALL CURRENT TRANSFORMER SECONDARIES BEFORE SERVICING.

MORE THAN ONE LIVE CIRCUIT. SEE DIAGRAM.

ADVERTISSMENT: CET EQUIPEMENT RENFERME PLUSIEURS CIRCUITS SOUS TENSION, V OIR LE SCHEMA

DEMKO 13 ATEX 1202591U

MADE IN U.S.A.

1201 SOUTH SECOND ST.

MILWAUKEE, WISCONSIN

53204

AEx nC IIC T3, Ex nL IIC T3 Gc X

Chapter 2 Installation

Figure 1 - CGCM Unit Overall Dimensions

14 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Installation Chapter 2

Electrical Connections

The CGCM unit’s 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 unit’s terminals with copper wire rated for a minimum of

°

600V. General appliance wire rated for minimum temperatures of 105

°

F) is acceptable. All wire must be copper. Select circuit conductors based on good

C (221

design practice.

The wire gauge range listed in the Te rm i na l B l oc k L ab el D e sc ri p ti on

table

indicates the physical capabilities of the connector.

The CGCM unit’s 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 units in a redundant system. Suggested torque for terminal
screws is 1 N•m (9 lb•in).

Refer to pages 17

…34 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

TB1

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

Range

2.6…2.1 mm
(10…12 AWG)

Label Description

2

PMG A Phase A excitation power supply
PMG B Phase B excitation power supply (three phase 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
SHLD1

SHLD2
EXC(-) Excitation output negative
EXC(+) Excitation output positive

other unit circuitry

other unit circuitry

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 15

Chapter 2 Installation

Table 1 - Terminal Block Label Description

Terminal Block Wire Gauge

Label Description

Range

2

TB3

2.6…2.1 mm
(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 mm
(14…18 AWG)

2

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

V Bus B

Phase A bus voltage input

Phase B bus voltage input

(1)

(1)

V Bus C Phase C bus voltage input
V Bus N Neutral bus voltage input

2

TB7

1.6…1.0 mm
(14…18 AWG)

VREF(+) Remote setpoint adjust input
VREF(-) Remote setpoint adjust input return
SHLD3 Shield 3 landing points are tied together but are not connected internally to protective earth or
SHLD3

other unit circuitry

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.

16 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Installation Chapter 2

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

Fuse

G

AC

B

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,
illustrating 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.

Refer to the wiring diagrams below.

Figure 2 - Excitation Power Connections, 3-phase PMG

Figure 3 - Excitation Power Connections, Single-phase PMG

PMG A

PMG

Figure 4 - Excitation Power Connections, Single-phase Shunt

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 17

PMG B
PMG C
SHLD 1
SHLD 1

TB1

Chapter 2 Installation

TB1

PMG A
PMG B

PMG C
SHLD 1
SHLD 1

Fuse

Fuse

G

AC

B

TIP

Figure 5 - Excitation Power Connections, 3-phase Shunt

Figure 6 - Excitation Power Connections, AREP Generator

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

18 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Installation Chapter 2

TB2

Shld2

Shld2
EXC (-)
EXC (+)

Exciter field

Exciter voltage
connections

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, Non-redundant CGCM

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

Refer to the redundancy wiring diagrams on pages 31

…32.

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

24 VDCControl

Power Source

Ground bus

Ground stud

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 19

BAT(+)
BAT(-)
FLT
RD RLY
CH GND

TB4

(typical)

CGCM

Chapter 2 Installation

Chassis Ground

The terminal 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

2

with minimum 2.6 mm

(10 AWG) copper wire attached to either stud on the

lower part of either side of the unit and to the CH GND terminal with 1.6 mm
(14 AWG) copper wire. When installed in a system with other CGCM units, use
a separate lead to the ground bus from each unit.

AC Voltage and Current Sensing

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

Generator and Bus Voltage Sensing

2

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

Refer to Terminal Block Label Description

on page 15 for possible wiring

configurations.

The terminals 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
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 below show
typical connections for various generator and bus connection schemes.

The CGCM unit supports these generator connection schemes:

• Single-phase

• Delta or Two-transformer Open Delta

• Three-wire Wye

• Four-wire Wye

The CGCM supports these bus connection schemes:

• Single-phase

• Delta or Two-transformer Open Delta

• Three-wire Wye

• Four-wire Wye

• Dual Breaker, Single-phase only

20 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Installation Chapter 2

Generator Current Sensing

CGCM 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 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 unit
for various bus and generator power system configurations. These diagrams do
not show all connections to the CGCM unit, nor are they intended to show all
possible wiring combinations. For assistance in wiring a CGCM unit in a power
system configuration not shown below, please contact Rockwell Automation.

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 21

L1

L2 L3

G

CB

TB 3

TB 6

VBus A
VBus B

VBus C
VBus N

TB 5

AC

B

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

Chapter 2 Installation

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

22 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

L1 NL2 L3

CB

N

Fuse

Fuse

Fuse

Fuse

Fuse

Fuse

G

AC

B

TB3

I1 (+) 5A
I1 (-)

ID (+) 5A

I3 (+) 5A

I2 (+) 5A
I2 (-)

I3 (-)

ID (-)

I1 (+) 1A

I2 (+) 1A

I3 (+) 1A

ID (+) 1A

TB6

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.

Installation Chapter 2

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

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 23

Chapter 2 Installation

L1 NL2 L3

G

CB

AC

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

VBu s A
VBu s B

VBu s C
VBu s N

TB5

VGe n A
VGe n B
VGe n C
VGe n 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.

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

24 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

L1 L2 L3

G

CB

AC

B

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
in either open or closed delta.

Installation Chapter 2

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

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 25

Chapter 2 Installation

L1 L2 L3

CB

N

Fuse

Fuse

Fuse

Fuse

Fuse

Fuse

G

AC

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

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.

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

26 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

Installation Chapter 2

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

VBus A
VBus B

VBus C
VBus N

TB 5

VGen A

VGen B

VGen C
VGen N

AC

B

Optional
Ground

To optional cross­current 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
in either open or closed delta.

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

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 27

Chapter 2 Installation

L1 A L2A L3 A

CB

Fuse

Fuse

Fuse

Fuse

Fuse

N

CB

L1B L2 B L3B

G

TB3

I1 (+ ) 5A
I1 (- )

ID (+ ) 5 A

I3 (+ ) 5A

I2 (+ ) 5A
I2 (- )

I3 (- )

ID (- )

I1 (+ ) 1A

I2 (+ ) 1A

I3 (+ ) 1A

ID (+ ) 1 A

TB6

VBus A
VBus B

VBus C
VBus N

TB5

VGen A
VGen B
VGen C

VGen N

AC

B

To optional cross­current reactive
compensation loop.

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

Customer Supplied CT
Shorting Switch or Test
Block

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

28 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013

L1 L2 L3

CB

Fuse

Fuse

TB 6

VBus A
VBus B

VBus C
VBus N

TB5

VGen A
VGen B
VGen C

VGen N

G

AC

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
Block

Installation Chapter 2

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

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 29

Chapter 2 Installation

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

The connections 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 shown in this diagram can be substituted for the CT
connections shown in Figures 9

B

AC

, 11, 14, and 16.

Customer Supplied CT
Shorting Switch or Test

Block

TB 3

I3 (+) 1A
I3 (+) 5A

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

I1 (+) 5A
I1 (-)

G

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.

30 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013