Basler Electric DECS-400 User Manual

INSTRUCTION MANUA L

FOR

DECS-400

Digital Excitation Control System

Publication: 9369700990
Revision: R Jan-15

9369700990 Rev R i

Caution

Note

Preface

This instruction manual provides information about the installation and operatio n of the DECS-400 Digital
Excitation Control System. To accomplish this, the following inform ati on is provid ed:

• General Information

• Controls and Indicators

• Functional Description

• BESTCOMS Software

• Installation

• Commissioning

• Maintenance and Troubleshooting

• Specifications

• Modbus™ Protocol

Conventions Used in this Ma nua l

Important safety and procedural information is emphasized and presented in this manual through
warning, caution, and note boxes. Each type is illustrated and defined as follows.

Warning!

Warning boxes call attention to conditions or actions that may cause
personal injury or death.

Caution boxes call attention to operating conditions that may lead to
equipment or property damage.

Note boxes emphasize important information pertaining to installation
or operation.

DECS-400 Preface

ii 9369700990 Rev R

Basler Electric does not assume any responsibility to compliance or noncompliance with national code, local code,

(software licensed in a way that ensures freedom to run,

copy, distribute, study, change, and improve the software)and you are granted a license to that software under the
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corresponding source code for the version of the programs distributed to you will be sent upon request (contact

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Review the software website for the latest version of the software documentation.

For terms of service relating to this product and software, see the Commercial Terms of Products and Services
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[e-mail]

Tel: [phone]

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© 2015 by Basler Electric

All rights reserved

First printing: January 2005

Warning!

READ THIS MANUAL. Read this manual before installing, operating, or maintaining the DECS-400.

Note all warnings, cautions, and notes in this manual as well as on the product. Keep this manual with
the product for reference. Only qualified personnel should install, operate, or service this system.
Failure to follow warning and cautionary labels may result in personal injury or property damage.
Exercise caution at all times.

or any other applicable code. This manual serves as reference material that must be well understood prior to
installation, operation, or maintenance.

This product contains, in part, open source software
terms of either the GNU General Public License or GNU Lesser General Public License. The licenses , at the time

may do with that software.
For at least three (3) years from the date of distribution of this product, a machine-readable copy of the complete

inf
is charged.

WARRANTY or even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Refer to the source code distribution for additional restrictions regarding warranty and copyrights.

For a complete copy of GNU GENERAL PUBLIC LICENSE Version 2, June 1991 or GNU LESSER GENERAL
PUBLIC LICENSE Version 2.1, February 1999 refer to www.gnu.org or contact Basler Electric. You, as a Basler
Electric Company customer, agree to abide by the terms and conditions of GNU GENERAL PUBLIC LICENSE
Version 2, June 1991 or GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999, and as such
hold Basler Electric Company harmless related to any open source software incorporated in this product. Basler
Electric Company disclaims any and all liability associated with the open source software and the user agrees to
defend and indemnify Basler Electric Company, its directors, officers, and employees from and against any and all
losses, claims, attorneys' fees, and expenses arising from the use, sharing, or redistribution of the software.

Preface DECS-400

9369700990 Rev R iii

This publication contains confidential information of Basler Electric Company, an Illinois corporation. It is loaned for

and options are subject to modification without notice. Over time, improvements and revisions may be made to this
manual.

The English-language version of this manual serves as the only approved manual version.

confidential use, subject to return on request, and with the mutual understanding that it will not be used in any
manner detrimental to the interests of Basler Electric Company and used strictly for the purpose intended.

It is not the intention of this manual to cover all details and variations in equipment, nor does this manual provide
data for every possible contingency regarding installation or operation. The availability and design of all features

publication. Before performing any of the following procedures, contact Basler Electric for the latest revision of this

DECS-400 Preface

iv 9369700990 Rev R

Preface DECS-400

9369700990 Rev R v

Contents

General Information .................................................................................................................................... 1

Features .................................................................................................................................................... 1

Generator Voltage Regulation ............................................................................................................... 2

Control Output ........................................................................................................................................ 2

Stability .................................................................................................................................................. 2

Power System Stabilizer (Style 1XXX) .................................................................................................. 3

Underfrequency Limiter or Volts per Hertz Limiter ................................................................................ 3

Soft-Start Voltage Buildup ..................................................................................................................... 3

Reactive Droop and Line Drop Compensation ...................................................................................... 3

Setpoint Control ..................................................................................................................................... 3

Dual Pre-Position Inputs ........................................................................................................................ 3

Manual Operating Modes ...................................................................................................................... 3

Var/Power Factor Operating Mode ........................................................................................................ 4

Overexcitation Limiters .......................................................................................................................... 4

Minimum Excitation Limiter .................................................................................................................... 4

Stator Current Limiter ............................................................................................................................ 4

Reactive Power Limiter .......................................................................................................................... 5

Autotracking Between DECS-400 Operating Modes ............................................................................. 5

Autotracking Between DECS-400 Units ................................................................................................ 5

Protective Functions .............................................................................................................................. 5

Programmable Logic .............................................................................................................................. 5

Metering ................................................................................................................................................. 6

Sequence of Events Recording ............................................................................................................. 6

Oscillography ......................................................................................................................................... 6

Real-Time Monitoring............................................................................................................................. 6

Internal Testing Provisions .................................................................................................................... 6

Communication ...................................................................................................................................... 6

Password Protection .............................................................................................................................. 7

Upgrading from DECS-300 to DECS-400 ................................................................................................. 7

Model and Style Number ........................................................................................................................... 7

Style Number ......................................................................................................................................... 7

Human-Machine Interface .......................................................................................................................... 9

Controls and Indicators.............................................................................................................................. 9

Menu System ........................................................................................................................................... 10

Menu Navigation .................................................................................................................................. 10

Menu Structure .................................................................................................................................... 10

Editing Settings ........................................................................................................................................ 20

Screens with Special Editing Modes.................................................................................................... 20

Password Protection ................................................................................................................................ 21

Metering Screen ...................................................................................................................................... 22

Metering Values ................................................................................................................................... 22

Setpoint ................................................................................................................................................ 23

Percent of Range ................................................................................................................................. 23

Alarms Message .................................................................................................................................. 24

Operating Mode ................................................................................................................................... 25

Functional Description ............................................................................................................................. 27

DECS-400 Function Blocks ..................................................................................................................... 27

Analog Input Circuits ............................................................................................................................ 27

Front Panel Keyboard .......................................................................................................................... 29

Contact Input Circuits .......................................................................................................................... 29

Digital Signal Processor ....................................................................................................................... 30

Microprocessor .................................................................................................................................... 30

IRIG Port .............................................................................................................................................. 30

Memory Circuits ................................................................................................................................... 31

DECS-400 Contents

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Digital to Analog Converter .................................................................................................................. 31

Control Output Circuits ........................................................................................................................ 31

Meter Driver Circuits ............................................................................................................................ 31

Relay Output Contacts ......................................................................................................................... 31

Front Panel LEDs................................................................................................................................. 32

Front Panel LCD .................................................................................................................................. 32

RS-232 Communication Port ............................................................................................................... 32

RS-485 Communication Ports ............................................................................................................. 32

Ethernet Port ........................................................................................................................................ 33

Modem ................................................................................................................................................. 33

Power Supply ....................................................................................................................................... 33

Startup Functions .................................................................................................................................... 33

Soft Start Function ............................................................................................................................... 33

Field Flash/Buildup .............................................................................................................................. 33

Failure to Build Up ............................................................................................................................... 34

Voltage Matching ................................................................................................................................. 34

Control Modes ......................................................................................................................................... 34

AVR ...................................................................................................................................................... 35

Manual ................................................................................................................................................. 35

Var ....................................................................................................................................................... 35

PF ........................................................................................................................................................ 36

Control Mode Pre-Pos it ion Setp oints ................................................................................................... 36

Transient Boost .................................................................................................................................... 37

Protection Functions ................................................................................................................................ 37

Field Overcurrent ................................................................................................................................. 37

Field Overvoltage ................................................................................................................................. 38

Generator Undervoltage ...................................................................................................................... 38

Generator Overvoltage ........................................................................................................................ 38

Loss of Sensing Voltage ...................................................................................................................... 38

Loss of Field Isolation Transducer ....................................................................................................... 39

Generator Frequency Less Than 10 Hertz .......................................................................................... 39

Power Supply Low ............................................................................................................................... 39

Loss of Field (40Q) .............................................................................................................................. 39

Field Overtemperature ......................................................................................................................... 40

Volts per Hertz (24) .............................................................................................................................. 40

Exciter Diode Monitor (EDM) ............................................................................................................... 42

Voltage / Current Unbalance Detection ............................................................................................... 43

Limiter Functions ..................................................................................................................................... 43

Stator Current Limiter .......................................................................................................................... 44

Overexcitation Limiter .......................................................................................................................... 44

Underexcitation Limiter ........................................................................................................................ 46

Underfrequency Limiter ....................................................................................................................... 47

Volts per Hertz Limiter ......................................................................................................................... 48

Var Limiter ............................................................................................................................................ 49

Limiter Scaling ..................................................................................................................................... 49

Operation with Paralleled Generators ..................................................................................................... 49

Droop Compensation ........................................................................................................................... 49

Reactive Differential ............................................................................................................................. 49

Line Drop Compensation ..................................................................................................................... 49

Autotracking ............................................................................................................................................. 50

Between DECS-400 Operating Modes ................................................................................................ 50

Between DECS-400 Units ................................................................................................................... 50

Data Recording and Reporting ................................................................................................................ 50

Sequence of Events ............................................................................................................................. 50

Data Logging ........................................................................................................................................ 51

Trending ............................................................................................................................................... 52

Power System Stabilizer.......................................................................................................................... 52

PSS Theory of Operation ..................................................................................................................... 53

Contents DECS-400

9369700990 Rev R vii

Rate of Frequency Change Blocking ................................................................................................... 58

Field Isolation Module.............................................................................................................................. 58

BESTCOMS™ Software ............................................................................................................................. 59

Installation ............................................................................................................................................... 59

Installing BESTCOMS ......................................................................................................................... 59

Starting BESTCOMS ............................................................................................................................... 59

The BESTCOMS Interface .................................................................................................................. 59

Communication ........................................................................................................................................ 61

RS-232 Port Communication ............................................................................................................... 61

Ethernet Port Communication .............................................................................................................. 61

Modem Communication ....................................................................................................................... 63

Settings, Metering Values, and Data R ecor ds ........................................................................................ 63

System Configuration .......................................................................................................................... 63

Settings ................................................................................................................................................ 71

Gain Settings ....................................................................................................................................... 77

Limiters ................................................................................................................................................ 81

Protection ............................................................................................................................................. 88

PSS ...................................................................................................................................................... 93

Metering ............................................................................................................................................... 98

Data Log ............................................................................................................................................ 102

Analysis .............................................................................................................................................. 111

Logic .................................................................................................................................................. 120

DECS-300 Settings File Converter ........................................................................................................ 120

Installation ............................................................................................................................................... 121

Mounting ................................................................................................................................................ 121

DECS-400 .......................................................................................................................................... 121

Field Isolation Module ........................................................................................................................ 121

Isolation Power Transformer .............................................................................................................. 121

Connections ........................................................................................................................................... 125

DECS-400 Terminations .................................................................................................................... 125

Field Isolation Module Terminations .................................................................................................. 127

DECS-400 Terminal Functions and Assignments ............................................................................. 127

Field Isolation Module Terminal Functions and Assignments ........................................................... 131

Cross-Current Compensation ............................................................................................................ 132

Typical Interconnections .................................................................................................................... 133

Communication Connections ............................................................................................................. 136

Commissioning ....................................................................................................................................... 139

Preparation ............................................................................................................................................ 139

Record System Parameters ............................................................................................................... 139

Testing and Evaluation .......................................................................................................................... 139

Off-Line Tests—Turbine Not Spin ning ............................................................................................... 139

Off-Line Tests—Turb ine Spinn ing ..................................................................................................... 142

Excitation Performance Evaluation .................................................................................................... 145

Recommended PSS Testing ............................................................................................................. 147

Maintenance ............................................................................................................................................ 149

Storage .................................................................................................................................................. 149

Warranty and Repair Service ................................................................................................................ 149

Troubleshooting ..................................................................................................................................... 149

DECS-400 Appears Inoperative ........................................................................................................ 149

Display Blank or Frozen ..................................................................................................................... 149

Generator Voltage Does Not Build .................................................................................................... 149

Generator Voltage Builds but DEC S-400 Fails To Flash................................................................... 150

Field Voltage or Current Reading on LCD Does Not Change ........................................................... 150

Low Generator Voltage (In AVR Mode) ............................................................................................. 150

High Generator Voltage (In AVR Mode) ............................................................................................ 151

Generator Voltage Unstable (Hunting) .............................................................................................. 151

DECS-400 Contents

viii 9369700990 Rev R

Poor Voltage Regulation .................................................................................................................... 151

No Buildup in FCR Mode ................................................................................................................... 151

No Control Signal at Firing Circuit Input ............................................................................................ 151

Limiters Do Not Limit at the Desired Level ........................................................................................ 151

Poor Reactive Control ........................................................................................................................ 151

Protection or Limit Annunciation ........................................................................................................ 151

Metering Readings Incorrect .............................................................................................................. 151

No Communication ............................................................................................................................ 151

Real-Time Clock Information Lost After Loss of Control Power ........................................................ 151

DECS-400 Reboots Frequently ......................................................................................................... 152

Backup Battery Replacement ................................................................................................................ 152

Upgrading DECS-400 Firmware ............................................................................................................ 152

Firmware Installation Procedure ........................................................................................................ 153

Specifications .......................................................................................................................................... 157

Operating Power .................................................................................................................................... 157

AC Input (Style XCXX Only) .............................................................................................................. 157

DC Input (Style XCXX, XLXX) ........................................................................................................... 157

Generator Voltage Sensing ................................................................................................................... 157

50 Hertz Sensing ............................................................................................................................... 157

60 Hertz Sensing ............................................................................................................................... 157

Bus Voltage Sensing ............................................................................................................................. 157

50 Hertz Sensing ............................................................................................................................... 157

60 Hertz Sensing ............................................................................................................................... 157

Generator Current Sensing ................................................................................................................... 158

Terminals ........................................................................................................................................... 158

Field Voltage and Current ..................................................................................................................... 158

Field Isolation Module............................................................................................................................ 158

Electrical Specification s ..................................................................................................................... 158

Physical Specifications ...................................................................................................................... 158

Contact Inputs ....................................................................................................................................... 158

Fixed Function Inputs ........................................................................................................................ 158

Programmable Inputs ........................................................................................................................ 159

Terminals ........................................................................................................................................... 159

Accessory Input (Remote Setpoint Control) .......................................................................................... 159

Voltage Input ...................................................................................................................................... 159

Current Input ...................................................................................................................................... 159

Control Outputs ..................................................................................................................................... 159

Voltage Control Output ...................................................................................................................... 159

Current Control Output ...................................................................................................................... 160

Metering Outputs ................................................................................................................................... 160

Contact Outputs ..................................................................................................................................... 160

Dedicated Outputs ............................................................................................................................. 160

Programmable Outputs ...................................................................................................................... 160

Contact Ratings ................................................................................................................................. 160

Terminal Assignments ....................................................................................................................... 160

Communication Ports ............................................................................................................................ 160

Com 0 ................................................................................................................................................ 160

Com 1 ................................................................................................................................................ 161

Com 2 ................................................................................................................................................ 161

Com 3 ................................................................................................................................................ 161

J1 ....................................................................................................................................................... 161

IRIG ....................................................................................................................................................... 161

Regulation Accuracy .............................................................................................................................. 161

AVR Mode .......................................................................................................................................... 161

FCR and FVR Mode .......................................................................................................................... 162

Var Control Mode ............................................................................................................................... 162

Power Factor Control Mode ............................................................................................................... 162

Metering Accuracy ................................................................................................................................. 162

Contents DECS-400

9369700990 Rev R ix

Power System Stabilizer (PSS) ............................................................................................................. 162

Traverse Rates ...................................................................................................................................... 162

Setpoint .............................................................................................................................................. 162

Pre-Position Setpoint ......................................................................................................................... 162

Setpoint Tracking ................................................................................................................................... 162

Delay .................................................................................................................................................. 162

Traverse Rate .................................................................................................................................... 163

Soft Start ................................................................................................................................................ 163

Soft Start Bias Level .......................................................................................................................... 163

Soft Start Time Delay ......................................................................................................................... 163

Sequence of Events Recording ............................................................................................................. 163

Data Logging (Oscillography) ................................................................................................................ 163

Trending ................................................................................................................................................ 163

Limiters .................................................................................................................................................. 163

Underfrequency Compensation ......................................................................................................... 163

Volts per Hertz ................................................................................................................................... 163

Summing Point Overexcitat ion Li mit er ............................................................................................... 164

Takeover Overexcitation Limiter ........................................................................................................ 164

Underexcitation .................................................................................................................................. 164

Stator Current .................................................................................................................................... 165

Reactive Power .................................................................................................................................. 165

Protection Functions .............................................................................................................................. 165

Field Overvoltage ............................................................................................................................... 165

Field Overcurrent ............................................................................................................................... 165

Generator Undervoltage .................................................................................................................... 165

Generator Overvoltage ...................................................................................................................... 165

Loss of Sensing Voltage .................................................................................................................... 165

Generator Underfrequenc y ................................................................................................................ 165

Loss of Field (40Q) ............................................................................................................................ 165

Field Overtemperature ....................................................................................................................... 165

Volts per Hertz (24) ............................................................................................................................ 166

Exciter Diode Failure.......................................................................................................................... 166

Type Tests ............................................................................................................................................. 166

Agency Certifications ............................................................................................................................. 166

UL ...................................................................................................................................................... 166

CE ...................................................................................................................................................... 166

GOST-R ............................................................................................................................................. 166

NIIPT .................................................................................................................................................. 166

Real-Time Clock Battery........................................................................................................................ 166

Environment .......................................................................................................................................... 167

Physical ................................................................................................................................................. 167

Programmable Logic .............................................................................................................................. 169

Logic Timer Configuration .................................................................................................................. 169

Logic Schemes ...................................................................................................................................... 170

Default Logic Scheme ........................................................................................................................ 170

Predefined Logic Schemes ................................................................................................................ 170

Logic Scheme Modification ................................................................................................................... 184

Open “Single DECS-400 Without PSS” Logic Scheme for Editing .................................................... 185

Delete Unneeded Logic Associations ................................................................................................ 187

Create New Logic Associations ......................................................................................................... 189

Verify and Finalize Modified Logic Scheme ....................................................................................... 192

Logic for Compound Machine Paralleling.............................................................................................. 192

Logic Definitions .................................................................................................................................... 195

Logic Inputs ........................................................................................................................................ 195

Outputs .............................................................................................................................................. 198

Modbus™ Communication ...................................................................................................................... 203

DECS-400 Modbus™ Protocol ............................................................................................................... 203

DECS-400 Contents

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Message Structure ................................................................................................................................ 203

Device Address Field ......................................................................................................................... 203

Function Code Field ........................................................................................................................... 204

Data Block Field ................................................................................................................................. 204

Error Check Field ............................................................................................................................... 204

Modbus Modes of Operation ................................................................................................................. 204

Serial Transmission Details ................................................................................................................... 204

Message Framing and Timing Considerations .................................................................................. 205

Error Handling and Exception Responses ......................................................................................... 205

Communication Hardware Requirements ............................................................................................. 206

RTU Communication Requirements .................................................................................................. 206

TCP Communication Requirements .................................................................................................. 206

Modbus™/TCP ....................................................................................................................................... 206

Detailed Message Query and Response............................................................................................... 206

Read Holding Registers ..................................................................................................................... 206

Preset Multiple Registers ................................................................................................................... 207

Preset Single Register (Write Single Holding Register) .................................................................... 208

Response ........................................................................................................................................... 208

Loop Back Diagnostic Test (FC=8) with Diagnostic Sub Function, Return Query Data ................... 209

Loop Back Diagnostic Test with Diagnostic Sub-Function, Restart Communications Option ........... 209

Loop Back Diagnostic Test with Diagnostic Sub-Function, Force Slave to Listen-Only Mode ......... 209

Data Formats ......................................................................................................................................... 209

Generic Types UI8 and I8 .................................................................................................................. 210

Generic Types UI16 and I16 .............................................................................................................. 210

Generic Types UI32 and I3 2 .............................................................................................................. 210

Floating Point (R23_32) Data Format ................................................................................................ 211

CRC Error Check ................................................................................................................................... 211

DECS-400 Modbus™ Register Space ................................................................................................... 212

DECS-400 Register Tables ................................................................................................................... 213

Holding Registers for Version Data ................................................................................................... 213

Holding Registers for Metering, Group 1 ........................................................................................... 214

Holding Registers for System Configuration ...................................................................................... 216

Holding Registers for Operating Mode Parameters ........................................................................... 217

Holding Registers for Setpoint Parameters ....................................................................................... 218

Holding Registers for Startup Parameters ......................................................................................... 220

Holding Registers for Limiter Parameters .......................................................................................... 221

Holding Registers for Gain Parameters ............................................................................................. 223

Holding Registers for Protection Function Parameters ..................................................................... 224

Holding Registers for Exciter Diode Monitor Parameters .................................................................. 225

Holding Registers for Relay Parameters ........................................................................................... 225

Holding Registers for General ASCII and Modbus Communication Parameters .............................. 226

Holding Registers for Metering Parameters, Group 2 ....................................................................... 227

Holding Registers for Power System Stabilizer Parameters ............................................................. 227

Revision History ...................................................................................................................................... 231

Contents DECS-400

9369700990 Rev R 1

General Information

The DECS-400 Digital Excitation Control System is a microprocessor-based controller that offers
excitation control, logic control, and optional power system stabilization in an integrated package. The
DECS-400 controls field excitation by providing an analog signal used to control the firing (output) of an
external power bridge. The DECS-400 monitors generator or motor parameters and acts to control, limit,
and protect the machine from operating outside its capability.

The optional, onboard power system stabilizer is an IEEE-d efi ned P SS 2A, dua l-input, “integral of
accelerating power” stabilizer that provides supplementary damping for low-frequency, local mode and
power system oscillations.

Integral programmable logic provides excitation system control and annunciation based on DECS-400
contact inputs, operating mode status, excitation system parameters, and user-defined programming.
Setup and initial operation are facilitated by Basler Electric’s user-friendly BESTCOMS™ PC software that
incorporates a test mode, flexible oscillography, and a graphic display of PSS test results.

The DECS-400 is designed for use with Basler Electric’s Interface Firing Module (IFM) and SSE or SSE-N
power bridges. However, it will work equally well with any power bridge with a firing circuit that is
compatible with the control signal output of the DECS-400.

Features

DECS-400 features and capabilities are listed below. The paragraphs following the list describe major
DECS-400 features and functions in more deta il .

• Five excitation control modes:

o Automatic Voltage Regulation (AVR)
o Field Current Regulation (FCR)
o Field Voltage Regulation (FVR)
o Power Factor (PF)
o Var

• Two pre-position setpoints (with adjustable traverse rate) for each excitation control mode

• Two PID groups

• Programmable analog control output selectable for 4 to 20 mAdc, –10 to +10 Vdc, or 0 to

+10 Vdc

• Remote setpoint control input accepts analog voltage or current control signal

• Real-time metering

• Integrated power system stabilizer (PSS):

o Generator or motor control modes, accommodates phase rotation changes between

modes

o Speed and power sensing or speed-only sensing
o Two-wattmeter or three-wattmeter methods of power measurement

• Soft start and voltage buildup control

• Five limiting functions:

o Stator current
o Overexcitation
o Underexcitation
o Underfrequency compensation
o Reactive power

• Ten protection functions:

o Field overvoltage
o Field overcurrent

DECS-400 General Information

2 9369700990 Rev R

o Generator undervoltage
o Generator overvoltage
o Loss of sensing voltage
o Generator frequency less than 10 hertz
o Loss of field (40Q)
o Field overtemperature
o Volts per hertz (24)
o Exciter diode failure

• IRIG time synchronization

• Sixteen contact inputs:

o Six fixed-function inputs: AVR, Manual, Lower, Rais e, Start, and Stop
o Ten user-programmable inputs

• Eight contact outputs:

o Two fixed-funct ion out puts : Watc h dog, On/O ff
o Six user-programmable outputs, configurable for maintained, latched, or momentary

operation

• Five communication ports:

o Front RS-232 port for interface with PC running BESTCOMS software
o Rear RS-485 port for dedicated communication with secondary, redundant DECS-400
o Rear RS-485 port using Modbus™ protocol for communication with remote terminal
o Rear RJ-11 jack connects to onboard modem that provides dial-in and dial-out capability
o Rear RJ-45 jack provides Ethernet network communication

• Data logging, sequence of events recording, and trending

Generator Voltage Regulation

By utilizing digital signal processing and precise regulation algorithms, the DECS-400 regulates the
generator rms voltage to within 0.2% of the setpoint from no-load to full-load.

Control Output

The DECS-400 supplies an isolated control output signal of 4 to 20 mAdc, 0 to 10 Vdc, or ±10 Vdc to the
firing or control circuits of external power stages. The dc current produced by the power stages provides
excitation to the field of the generator, motor, or exciter. The DECS-400 can control virtually any bridge
that is capable of accepting these signals and is suitable for use on synchronous generators or motors.

Stability

PID (proportional + integral + derivative) stability control is utilized by the DECS-400. Preprogrammed
stability (PID) settings are provided for both main field and exciter field applications. A suitable, standard
stability set is available for most machines and applications. An additional, customizable setting group
provides optimum generator transient performance. A PID selection/calculation program supplied with the
DECS-400 assists in selecting the correct PID settings. Additional stability adjustments are provided for
customizing the stability and transient performance of the minimum and maximum excitation limiters and
the var/power factor controllers.

PID Setting Groups

The DECS-400 provides for two sets of PID settings to optimize performance under two distinct operating
conditions, such as with a power system stabilizer (PSS) in or out of service. A fast controller provides
optimum transient performance with the PSS in service, while a slower controller can provide improv ed
damping of first swing oscillations with the PSS offline.

General Information DECS-400

9369700990 Rev R 3

Power System Stabilizer (Style 1XXX)

An optional, integrated PSS duplicates the excellent performance of the Basler PSS-100 power system
stabilizer without the complications of an additional control device. The PSS provides damping for local
mode, inter-area, and inter-unit oscillations in the 0.1 to 5.0 hertz range. The PSS incorporated in the
DECS-400 is a dual-input, IEEE type PSS2A stabilizer that utilizes the “integral of accelerating power”
algorithm. The PSS can also be set up to respond only to frequency if required for unusual applications.
Inputs required for PSS operation include three phase voltages and two or three phase line currents.

Underfrequency Limiter or Volts per Hertz Limiter

An underfrequency limiter or a V/Hz ratio limiter can be selected to avoid overfluxing the generator or
other connected magnetic devices.

The underfrequency limiter slope can be set from 0 to 3 PU V/Hz in 0.1 hertz increments . The frequ enc y
roll-off knee-point can be set across a range of 15 to 90 hertz in 0.1 hertz increments.

The V/Hz ratio limiter regulates voltage based on a user-defined V/Hz slope that is adjustable between
zero and 3.0 PU. The V/Hz ratio limiter includes two lim iting lev els to permit operation above the primary
V/Hz range for a user-adjustable time limit to inhibit limiter response during transient frequency or voltage
excursions.

Soft-Start Voltage Buildup

A user-adjustable voltage soft-start feature controls the rate of generator voltage buildup and prevents
voltage overshoot during generator system startup. The soft-start feature is active in both AVR and
Manual operating modes.

Reactive Droop and Line Drop Compensation

The DECS-400 has provisions for paralleling two or more generators by using reactive droop. Reactive
differential compensation can be used with the addition of an external current transformer (CT) with a
nominal secondary rating of 1 Aac or 5 Aac. The current input burden is less than 1 VA, so existing
metering CTs can be used. A Line Drop Compensation setting allows the DECS-400 to compensate for
line drop between parallel generators.

Setpoint Control

External adjustment of the active DECS-400 setpoint is possible through:

• Raise and lower contact inputs

• An auxiliary analog control input of 4 to 20 mAdc or ±10 Vdc

• A PC operating BESTCOMS software (provided with the DECS-400) and connected to the RS-

232 communication port

• A controller using Modbus™ protocol and connected to the RS-485 port

The traverse rates of all operating modes are independently adjustable, so the operator can customize
the rate of adjustment and “feel” to meet his or her needs.

Dual Pre-Position Inputs

Two user-adjustable sets of predetermined operating points are provided for each mode of operation. At
startup, and with the appropriate contact inputs applied to the DECS-400, the operating mode is driven to
one of two preset operating or regulation levels (depending on the configuration of the system). An
adjustable traverse rate setting can be used to control the rate at which the setpoint is driven toward the
pre-position operating point. This feature allows the DECS-400 to be configured for multiple system and
application needs.

Manual Operating Modes

The DECS-400 has two manual modes of operation: Field Current Regulation (FCR) and Field Voltage
Regulation (FVR).

DECS-400 General Information

4 9369700990 Rev R

Field Current Regulation Mode

When operating in FCR mode, the DECS-400 regulates the dc output current of the power bridge.
Because regulation of the field current is not dependent upon a generator voltage sensing input to the
DECS-400, FCR mode can provide backup excitation control when a loss of sensing is detected. In FCR
mode, as the generator load varies, the operator must manually vary the field current to maintain nominal
generator voltage.

Field Voltage Regulation Mode

When operating in FVR mode, the DECS-400 regulates the dc output voltage of the power bridge. FVR
enables the user to perform generator modeling and validation testing in accordance with WECC testing
requirements for bus-fed (shunt type) excitation systems. FVR mode can also be used to smooth the
transfer from the active exciter to a backup exciter.

Var/Power Factor Operating Mode

Var and Power Factor control modes are available when the generator is operating in parallel with the
utility power grid. In Var control mode, the DECS-400 regulates the generator’s var output at a user­adjustable setting. In Power Factor control mode, the DECS-400 regulates the generator’s var output to
maintain a specific power factor as the kW load varies on the generator.

Overexcitation Limiters

Overexcitation limiters monitor the field current output of the voltage regulator or static exciter and act to
limit the field current to prevent field overheating. The Overexcitation Limiter (OEL) function includes a
cool-down feature to avoid damage to the rotor caused by repeated high forcing. The OEL is active in all
modes except FCR mode. In FCR mode, limiter action is optional. The DECS-400 provides a choice of
two types of overexcitation limiters: Summing Po int and Tak eover . Th e outpu t of the Sum min g Point
limiter is applied to the summing junction of the AVR control loop in addition to the AVR controller output.
The output of the Takeover limiter overrides the normal AVR output.

Summing Point OEL

Three OEL current levels are defined for on-line operation: high, medium, and low. The generator can
operate continuously at the low OEL current level and for programmed times at the medium and high OEL
current levels. Two OEL current levels are defined for off-line (main breaker open) operation: high and
low. The generator can operate continuously at the low OEL current level and for a programmed time at
the high OEL current level.

Takeover OEL

The Takeover OEL determines the field current level at which limiting occurs by using an inverse time
characteristic. Two current levels and a time dial setting are defined for the Takeover OEL. Separate
curves may be selected for on-line and off-line operation. If the system enters an overexcitation condition,
the field current is limited and made to follow the selected curve. Selection of on-line or off-line OEL levels
and curves is determined by an OEL option selection.

Minimum Excitatio n Limite r

The Minimum Excitation Limiter prevents the excitation, being supplied to the generator field, from
decreasing below safe operating levels. This prevents pole slip and possible machine damage. This
action also limits the amount of vars being absorbed by the machine, based on user-defined settings. An
internally-generated Underexcitation Limiting (UEL) curve based on a permissible var level at 0 kW can
be utilized. Alternately, a five point UEL curve can be created to match specific generator characteristics.
UEL action is optional in FCR mode.

Stator Current Limiter

The stator current limiter (SCL) senses the level of stator current and limits it to prevent stator
overheating. The SCL operates in all modes except FCR and when the DECS-400 is off-line (52 J/K and

General Information DECS-400

9369700990 Rev R 5

52 L/M contact inputs are closed). In FCR mode, the DECS-400 provides indication that a stator
overcurrent condition exists, but limiter action is inhibited.

Two SCL current levels are provided: high and low. The generator can operate continuously at the low
SCL level, but only for a programmed time at the high SCL level.

Reactive Power Limiter

The var limiter accommodates applications where the prime mover (turbine) has been uprated but the
generator ratings are unchanged. In this case, the generator power factor is increased and the generator
is var limited. The var limiter is available for these applications to limit reactive power flow out of the
generator to a safe level.

Autotracking Between DECS-400 Operating Modes

The DECS-400 can provide autotracking (automatic following) of the controlling mode by the non­controlling modes. This allows the operator to initiate a controlled, bumpless transfer of the DECS-400
between operating modes with minimal disturbance to the power system. This feature can be used in
conjunction with a set of protective relays to initiate a transfer to a backup mode of operation (such as
FCR mode) upon the detection of a system failure or fault (such as loss of sensing).

Autotracking Between DECS-400 Units

The DECS-400 is also designed to automatically track a second DECS-400 unit using dedicated
communication ports on the two units. A backup DECS-400 controller can be placed in service and
programmed to track the control output of the primary DECS-400. In the unlikely event of a failure of the
first DECS-400, protective relays can initiate a transfer of control from the first to the second DECS-400
with minimal system disturbance.

Protective Functions

Protective functions built into the DECS-400 may be used as a backup to the primary protection relays
and can be assigned to as many as six programmable output contacts via BESTCOMS software. The
protective functions offer fully adjustable tripping levels and time delays. DECS-400 protective functions
are listed below. Functions marked with an asterisk (∗) have dual setting groups.

• Field overcurrent ∗

• Field overtemperature ∗

• Field overvoltage ∗

• Generator overvoltage ∗

• Generator undervoltage ∗

• Loss of field ∗

• Loss of Field Isolation Module

• Loss of sensing voltage

• Microprocessor watchdog

• Open exciter diode (brushless application)

• Shorted exciter diode (brushless application)

• Volts per hertz protection

Programmable Logic

The DECS-400 utilizes programmable logic functionality in the form of multiplexors, AND gates, OR
gates, NOT gates, and timer gates. Inputs to the logic are in the form of discrete information including
switching inputs, system status data, protection status data, limiter status data, alarm status data, and
PSS status data. The outputs of the programmable logic module can be used to control the relay outputs
as well as various other functions inside the DECS-400 such as control functions (start/stop, mode select,
etc.), protection functions (Field Overvoltage Enable, Field Overcurrent Enable, etc.), limiter functions
(OEL enable, UEL enable, etc.), and PSS functions. BESTCOMS provides a tool for customizing the
system control logic for specific applications.

DECS-400 General Information

6 9369700990 Rev R

Metering

Two programmable, 4 to 20 mAdc, analog meter drivers are provided. The meter side is isolated from
DECS-400 circuitry. Either driver can be programmed to meter a broad range of generator and system
parameters.

Sequence of Events Recording

An integrated sequence of events recorder (SER) can be used to reconstruct the exact time of an event
or disturbance. The DECS-400 monitors its contact inputs and outputs for changes of state, system
operating changes, and alarm conditions. If any of these events occurs, the DECS-400 logs that event
with a date and time stamp. The resulting event record allows the user to analyze a chain of events with
accurate information regarding the sequence in which they occurred. Up to 127 events can be stored in
DECS-400 volatile memory and those events are retrievable through BESTCOMS software.

Oscillography

The data recording feature can record up to six oscillographic records and store them in volatile memory.
Up to six variables can be selected for monitoring. These variables include generator voltage, generator
current (single-phase), frequency, kW, power factor, field voltage, and field current. Oscillographic records
can be triggered through BESTCOMS or by a logic trigger or level trigger.

During commissioning, BESTCOMS can be used to trigger and save a record of a voltage step response.
At the completion of commissioning, a logic trigger or level trigger can be used to activate the data
recorder to capture the occurrence for review at a later time. DECS-400 alarms can also be used to start
the data recorder. When an alarm condition occurs, an oscillographic record can be stored. A level trigger
will initiate a record to be saved when a variable (such as field current) exceeds a predetermined setting.
Oscillographic records are recorded in accordance with the IEEE Standard Common Format for Transient
Data Exchange (COMTRADE) or log file format. Basler Electric provides BESTwave™, a COMTRADE
viewer that enables viewing of oscillography records saved by the DECS-400.

Real-Time Monitoring

Real-time monitoring is possible for any of the parameters available for oscillography. The HMI real-time
monitoring screen will display up to two parameters simultaneously. This data can be stored in a file for
later reference.

Internal Testing Provisions

Using BESTCOMS, the user can configure and run both frequency and step response tests to facilitate
commissioning or demonstrate system performance. The frequency response test has a frequency range
of 0.1 to 10 hertz, and gain/phase informat ion is gener ated in the form of a Bode plot . The DEC S -400
also allows injection of test signals at various points in the PSS/voltage regulation loop for a high level of
testing flexibility.

Communication

The DECS-400 is supplied with BESTC OM S sof twar e whic h makes DECS -400 programming and
customization fast and easy. BESTCOMS includes a PID selection utility that provides a user-friendly
format for selecting stability settings. BESTCOMS has monitoring screens for viewing all settings,
metering screens for viewing all machine parameters, and control screens for remote control of the
excitation system. A file converter within BESTCOMS enables conversion of DECS-300 settings files for
use with the DECS-400.

An RS-485 port on the rear panel supports Modbus™ (floating point) communication protocol. Modbus™ is
an open protocol, with all registers and operating instructions available in this instruction manual. This
makes it simple for the user to develop custom communication software.

An Ethernet port on the rear panel enables communication with the DECS-400 over a TCP/IP network.
Ethernet support in the DECS-400 enables remote access to DECS-400 settings and data through
Modbus TCP or BESTCOMS. DECS-400 time synchronization with a network time server is also
possible.

General Information DECS-400

9369700990 Rev R 7

An internal modem is also provided to remotely access DECS-400 settings and alarms.

Password Protection

All DECS-400 parameters can be viewed at the front pane l display, throu gh BE ST C OMS, or through
Modbus™ without the need of a password. If the user wishes to change a setting, the proper password
must be entered to allow access to the parameter. Two levels of password protection exist. One level
provides global access to all parameters. The other level provides limited access to parameters normally
associated with operator control.

Upgrading from DECS-300 to DECS-400

The upgrading process was designed to be easy, but some additional wiring may be necessary. An
escutcheon plate for easy installation is recommended (see the Installation chapter). To make the
upgrade process easier, BESTCOMS software for the DECS-400 provides a tool to convert a DECS-300
settings file to a DECS-400 settings file (see the BESTCOMS Software chapter).

Model and Style Number

DECS-400 electrical characteristics and operational features are defined by a combination of letters and
numbers that make up the style number. The model number, together with the style number, describe the
options included in a specific device and appear on a label affixed to the rear panel.

Style Number

The style number identification chart in Figure 1 defines the electrical characteristics and operational
features available in the DECS-400.

Figure 1. DECS-400 Style Chart

DECS-400 General Information

8 9369700990 Rev R

General Information DECS-400

9369700990 Rev R 9

Locator

Description

A

Null Balance Indicator. This LED lights when the setpoint of the inactive operating
modes (AVR, FCR, Var, or Power Factor) match the setpoint of the active mode.

B

PSS Active Indicator. This LED lights when the integrated power system stabilizer is
disturbance.

C

Pre-Position Indicator. This LED lights when the setpoi nt of the active oper at in g mode is
at either of the two pre-position setting levels.

D

Lower Limit Indicator. This LED lights when the setpoi nt of the activ e operat in g mode is
decreased to the lower setpoint limit.

E

Upper Limit Indicator. This LED lights when the set po i nt of the activ e operat in g mode is
increased to the upper setpoint limit.

F

Latch. Two lever-style latches (locators F and M) secure the DECS-400 draw-out
draw-out assembly in place.

G

Communication Port. This R S-23 2 port has a female D B-9 connector for local

400).

Human-Machine Interface

This chapter describes the DECS-400 human-machine interface (HMI) and illustrates navigation of the
menu tree accessed through the front panel and LCD.

Controls and Indicators

DECS-400 controls and indicators are illustrated in Figure 2 and described in Table 1. The locators and
descriptions of Table 1 correspond to the locators shown in Figure 2.

Figure 2. Controls and Indicators

Table 1. Control and Indicator Descriptions

enabled and can generate a stabilizing signal in response to a power system

assembly in its case. A captive Phillips screw in each latch can be tightened to lock the

communication with a PC operating BESTCOMS software (supplied with the DECS-

DECS-400 Human-Machine Interfac e

10 9369700990 Rev R

Locator

Description

H

Reset Pushbutton. This button is pressed to reset DECS-400 alarms or cancel a
settings editing session.

I

Scrolling Pushbuttons. These four buttons are used to scroll up, down, left, and right

the up and down scrolling pushbuttons change the value of the variable.

J

Edit Pushbutton. Pressing this button starts an editing session and enables changes to

pushbutton is pressed to save the setting changes and the LED turns off.

K

Display. The display consists of a 128 by 64 pixel, liquid crystal display (LCD) with LED

settings.

L

Identification Label. The identification label contains information such as the model,
style, and serial numbers and operating power and sensing current ratings.

M

Latch. Two lever-style latches (locators F and M) secure the DECS-400 draw-out
draw-out assembly in place.

through the menu tree displayed on the front panel display (locator K). During an editing
session, the left and right scrolling pushbuttons select the variable to be changed and

DECS-400 settings. When the Edit pushbutton is pressed to open an editing session,
an LED on the button lights. At the conclusion of the editing session, the Edit

backlighting. It serves as a local source of information provided by the DECS-400 and is
used when programming settings through the front panel. The LCD displays operations,
setpoints, loop gains, metering, protection functions, system parameters, and general

assembly in its case. A captive Phillips screw in each latch can be tightened to lock the

Menu System

The front panel menu system consists of a network of screens that enable the user to edit DECS-400
settings and view system parameters.

Menu Navigation

Movement through the front panel menu system is achieved by pressing the four, front-panel scrolling
pushbuttons (locator I in Figure 2).

Navigation aids assist the user in moving from screen to screen and are provided at the top and bottom
lines of each screen.

The top line of each screen contains the menu path which is similar to the path of a file on a PC. When
the menu path exceeds the width of the LCD, the first part of the menu path is replaced with two periods
(..) so that the last part of the path remains visible.

The bottom line indicates which menu screens can be accessed from the current screen by using the left,
lower, or right scrolling pushbuttons. The screens accessed by the left, lower, and right scrolling
pushbuttons are indicated by a <, v, and > symbol followed by an abbreviated menu name.

The front panel Reset pushbutton (locator H in Figure 2) provides a shortcut to the metering screen when
a settings editing session is not in progress.

Menu Structure

The front panel menu system has nine branches:

1. Operating. Start/stop, mode, and pre-position setpoint status.

2. Setpoints. Mode setting values such as AVR, FCR, droop, var, and power factor.

3. Loop Gains. PID settings.

4. Metering. Real-time metering of user-selected parameters and alarm messages.

5. Protection. Protective Function setting parameters.

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9369700990 Rev R 11

6. Limiters. System limiters such as overexcitation and underexcitation.

7. PSS. The power system stabilizer menu consists of four sub-menus which include Control,

Parameters, Limiters, and Configuration.

8. System Parameters. The system parameters menu consists of nine sub-menus which include

Generator Data, Field Data, Transformers, Configuration, Output Contacts, Traverse Rates, Pre­position Modes, Startup, and Tracking.

9. General Settings. The general settings menu consists of three sub-menus which include

Communications, LCD Contrast, and Real-Time Clock.

From the DECS-400 title screen, the Operating menu branch is accessed first by pressing the Down
pushbutton. Then, the remaining branches are accessed by pressing the left or right scrolling push­buttons.

A detailed list of the menu system screens is provided below. The menu paths appear on the left and the
settings appear on the right.

\D400\OPER OPERATING
\OPERATE_1 START/STOP

AVR/MANUAL
PF OR VAR
FCR OR FVR
PREPOSN 1
PREPOSN 2

\OPERATE_2 VOLT MATCH
INT TRACK
EXT TRACK
CROSS CURNT
LINE DROP
DROOP

\OPERATE_3 INNER LP
\D400\SETPT SETPOINTS

\MODE_SET1 AVR MODE
FCR MODE
DROOP
VAR MODE
PF MODE
FVR MODE

\MODE1\RANGE_1 FINE V BD
AVR MIN
AVR MAX
FCR MIN
FCR MAX
KW LVL TRNS

\MODE1\RANGE_2 MIN VAR OUT
MAX VARA OUT
MAX LAG PF
MAX LEAD PF
FVR MIN
FVR MAX

\MODE1\RANGE_3 V MATCH BD
V MATCH REF

\MODE_SET2 LINE DROP
\PREP_SET1 AVR MODE

FCR MODE
VAR MODE

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12 9369700990 Rev R

PF MODE
FVR MODE

\PREP_SET2 AVR MODE
FCR MODE
VAR MODE
PF MODE
FVR MODE

\D400\GAIN LOOP GAINS
\P_AVR_GAINS PRI STB RG

AVR Kp
AVR Ki
AVR Kd
AVR Td
AVR Kg

\AVRG1\S_AVR_GAINS SEC STB RG
AVR Kp
AVR Ki
AVR Kd
AVR Td
AVR Kg

\P_FCR_GAINS FCR Kp
FCR Ki
FCR Kd
FCR Td
FCR Kg

\P_FVR_GAINS FVR Kp
FVR Ki
FVR Kd
FVR Td
FVR Kg

\LIM_GAINS OEL Ki
OEL Kg
UEL Ki
UEL Kg
SCL Ki
SCL Kg

\LIMGN\\LIM_GAINS2 VARL Ki
VARL Kg

\CTL_GAINS PF Ki
PF Kg
VAR Ki
VAR Kg
V MATCH Kg

\IN_LP_GAINS INNER LP Ki
INNER LP Kg

\D400_METERING METERING
See Metering Screen, Mete r ing Va lues for a list of the parameters available for display.

\D400_PROT PROTECTION
\V/HZ_PROT1 V/HZ ENABLE

V/HZ PCKUP
TIME DIAL
RESET DIAL
DLAY1 PKUP
DLAY1 TIME

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9369700990 Rev R 13

\V/HZ_PROT2 DLAY2 PKUP
DLAY2 TIME
CURVE EXP

\PROT_ENAB1 FIELD OV
FIELD OC
STATOR OV
STATOR UV
NO SENSING
NO SNS->MAN

\ENAB1\S_PROT_ENE FIELD OV
FIELD OC
STATOR OV
STATOR UV
FIELD OT
LOSS FIELD

\PROT_ENAB2 FIELD OT
LOSS FIELD
FIT FAILED
POWER LOW
EX DIOD OD
EX DIOD SD

\P_PROT_LVL1 FIELD OV
FIELD OC
STATOR OV
STATOR UV
FIELD OT
LOS BAL V

\P_PROT_LVL1 FIELD OV
FIELD OC
STATOR OV
STATOR UV
FIELD OT
LOSS FIELD

\P_PROT_LVL2 LOS IMBAL V
LOSS FIELD
EDM OD RPL
EDM SD RPL
EDM INH LVL

\P_PROT_TMR1 FIELD OV
FIELD OC TD
STATOR OV
STATOR UV
NO SENSING
FIELD OT

\P_TM1\S_PROT_TMR1 FIELD OV
FIELD OC TD
STATOR OV
STATOR UV
FIELD OT
LOSS FIELD

\P_PROT_TMR2 LOSS FIELD
FIT FAILED
EX DIOD OD
EX DIOD SD

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14 9369700990 Rev R

\D400\LIMIT LIMITERS
\OPTION_1 OEL STYLE

OEL OPTION
UEL STYLE
OEL GROUP
UEL GROUP
SCL GROUP

\OPTION_2 UF OR V/HZ
OEL ENABLE
UEL ENABLE
SCL ENABLE
UEL FLTR TC
UEL VOL EXP

\P_ONLINE INST LIMIT
INST TIME
MED LIMIT
MED TIME
CONT LIMIT

\P_ONL\S_ONLINE INST LIMIT
INST TIME
MED LIMIT
MED TIME
CONT LIMIT

\P_OFFLINE OEL HI LIM
HI LIM TIME
OEL LO LIM

\P_OFL\S_OFFLINE OEL HI LIM
HI LIM TIME
OEL LO LIM

\P_OFFTAKOVR OEL MAX CUR
OEL MIN CUR
OEL TD

\P_OFT\S_OFFTAKOVR OEL MAX CUR
OEL MIN CUR
OEL TD

\P_ONTAKOVR OEL MAX CUR
OEL MIN CUR
OEL TD

\P_ONT\S_ONTAKOVR OEL MAX CUR
OEL MIN CUR
OEL TD

\P_UEL_CRV_X PNT 1 WATTS
PNT 2 WATTS
PNT 3 WATTS
PNT 4 WATTS
PNT 5 WATTS

\P_UEX\S_UEL_CRV_X PNT 1 WATTS
PNT 2 WATTS
PNT 3 WATTS
PNT 4 WATTS
PNT 5 WATTS

\P_UEL_CRV_Y PNT 1 VARS
PNT 2 VARS
PNT 3 VARS
PNT 4 VARS
PNT 5 VARS

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9369700990 Rev R 15

\S_UEL_CRV_Y PNT 1 VARS
PNT 2 VARS
PNT 3 VARS
PNT 4 VARS
PNT 5 VARS

\P_SCLIM SCL HI LIM
HI LIM TIME
SCL LO LIM
INIT DELAY

\P_SCL\S_SCLIM SCL HI LIM
HI LIM TIME
SCL LO LIM
INIT DELAY

\VARLM VARL ENABLE
PRI SETPOINT
PRI INITDLY
SEC SETPNT
SEC INITDLY
VARL GROUP

\UF_V/HZ CORNER FREQ
UF SLOPE
V/HZ HI
V/HZ LO
V/HZ TIME

\D400\PSS POWER SYSTEM STABILIZER
\CONTROL PSS CONTROL
\P_BASIC_CTL SETTING GRP

TM PWRN TLD
TM PWR HYST

\P_CTL\S_BASIC_CTL SECONDARY
TM PWRN TLD
TM PWR HYST

\P_SOFT_SW1 SSW 0
SSW 1
SSW 2
SSW 3
SSW 4
SSW 5

\P_SS1\S_SOFT_SW2 SSW 0
SSW 1
SSW 2
SSW 3
SSW 4
SSW 5

\P_SOFT_SW2 SSW 6
SSW 7
SSW 8
SSW 9
SSW 10

\P_SS2\S_SOFT_SW2 SSW 6
SSW 7
SSW 8
SSW 9
SSW 10

DECS-400 Human-Machine Interfac e

16 9369700990 Rev R

\D400\PSS\PARAMETER PSS PARAMETER S
\P_FILTER1 QUADTURE XQ

SCALER KPE
LP FLTR T11
LP FLTR T12
LP FLTR T13
RT FLTR TR

\P_FTR\S_FILTER
SCALER KPE
LP FLTR T11
LP FLTR T12
LP FLTR T13
RT FLTR TR

\P_FILTER2 HP FLTR H
HP FLTR TW1
HP FLTR TW2
HP FLTR TW3
HP FLTR TW4

\P_FTR\S_FILTER2 HP FLTR H
HP FLTR TW1
HP FLTR TW2
HP FLTR TW3
HP FLTR TW4

\P_FILTER3 NUM EXP N
NUM EXP M

\P_FTR\S_FILTER3 SECONDARY FILTER 3
NUM EXP N
NUM EXP M

\P_TRSN_FLTR FILTER 1 ZN
FILTER 1 ZD
FILTER 1 WN
FILTER 2 ZN
FILTER 2 ZD
FILTER 2 WN

\P_TSN\S_TRSN_FLTR FILTER 1 ZN
FILTER 1 ZD
FILTER 1 WN
FILTER 2 ZN
FILTER 2 ZD
FILTER 2 WN

\P_PHSE_COMP1 PHASE 1 TLD
PHASE 1 TLG
PHASE 2 TLD
PHASE 2 TLG

\S_PHSE_COMP1 PHASE 1 TLD
PHASE 1 TLG
PHASE 2 TLD
PHASE 2 TLG

\P_PHSE_COMP2 PHASE 3 TLD
PHASE 3 TLG
PHASE 4 TLD
PHASE 4 TLG

\S_PHSE_COMP2 PHASE 3 TLD
PHASE 3 TLG
PHASE 4 TLD
PHASE 4 TLG

QUADTURE XQ

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9369700990 Rev R 17

\D400\PSS\LIMTERS PSS LIMITERS
\P_OUTPUT_LMT UPPER LIMIT

LOWER LIMIT
GAIN

\S_OUTPUT_LMT UPPER LIMIT
LOWER LIMIT
GAIN

\P_VOLT_LIMIT TIME CONST
SETPOINT

\P_VLT\S_VOLT_LMT TIME CONST
SETPOINT

\P_LOGIC_LMT FLTR NRM TM
FLTR LMT TM
OUT UPR LMT
OUT LWR LMT
OUT TM DLY

\P_LOG\S_LOGIC_LMT FLTR NRM TM
FLTR LMT TM
OUT UPR LMT
OUT LWR LMT
OUT TM DLY

\D400\PSS\CONFIG PSS CONFIGURATION
\CNFG SET GP SETTING GROUP CONFIGURATION

PWR TLD ENA
SG PWR TLD
ST PWR HYST

\PSS_ROC ROC ENABLE
ROC THRESH
ROC TM DLY
ROC BLKTIM
ROC LPF TC
ROC WF TC

\D400\SYSTEM SYSTEM PARAMETERS
\GENERATOR GENERATOR DATA
\GEN\GEN_DATA RATED VOLT

FREQUENCY
RATED KVA

\FIELD_DATA FIELD DATA
\FIELD_DATA1 FIELD VOLT

FIELD CURR
SHUNT RATING
ISOL BOX IN
FIELD RES
AMB TEMP

\FIELD_DATA_2 BRUSH DROP
POLE RATIO

\TRNSFRMRS TRANSFORMERS
\XFMRS\XFMR_DATA GEN PT PRI

GEN PT SEC
BUS PT PRI
BUS PT SEC
GEN CT PRI
GEN CT SEC

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\CONFIGURE CONFIGURATION
\CONFG\CNFG_DATA_1 FIELD TYPE

VLTAGE SNSE
MOTOR MODE
CURRNT SNSE
CT SELECT

\CNFG\CNFG_DATA_2 CTRL SIGNAL
AUX IN TYPE
AUX IN FCTN
CRSS I GAIN
TEMP MODE

\AUX_GAINS AVR MODE
FCR MODE
VAR MODE
PF MODE
FVR MODE
INNER/OUTER

\CONTACTS OUTPUT CONTACTS
\CNTCT\RELAY_1 OUTPT SENSE

OUTPUT TYPE
MOMENT TIME

\CNTCT\RELAY_2 OUTPT SENSE
OUTPUT TYPE
MOMENT TIME

\CNTCT\RELAY_3 OUTPT SENSE
OUTPUT TYPE
MOMENT TIME

\CNTCT\RELAY_4 OUTPT SENSE
OUTPT TYPE
MOMENT TIME

\CNTCT\RELAY_5 OUTPT SENSE
OUTPT TYPE
MOMENT TIME

\CNTCT\RELAY_6 OUTPT SENSE
OUTPT TYPE
MOMENT TIME

\TRVRS_HEAD TRAVERSE RATES
\TRVRS\TRVRS_RATE AVR MODE

FCR MODE
VAR MODE
PF MODE
FVR MODE

\PMODE_HEAD PRE-POSITION MODES
\PMODE\PREP_MODE1 AVR MODE

FCR MODE
VAR MODE
PF MODE
FVR MODE

\PREP1_RATES1 AVR TRAVEL
AVR RATE
FCR TRAVEL
FCR RATE
VAR TRAVEL
VAR RATE

\PREP1_RATES2 PF TRAVEL
PF RATE

Human-Machine Interface DECS-400