Basler-electric DECS-250N User Manual Page 17
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9440500990 Rev C 1
DECS-250N Introduction
Introduction
DECS-250N Digital Excitation Control Systems offer precise excitation control and machine protection in
a compact package. DECS-250N adaptability to many applications is assured through configurable
contact inputs and outputs, flexible communication capabilities, and programmable logic implemented
with the provided BESTCOMSPlus
®
software.
Features and Functions
DECS-250N features and functions include:
• Precise excitation control for synchronous generator or synchronous motor applications
o Power factor and var metering values will be opposite in motor mode
• Five excitation control modes:
o Automatic Voltage Regulation (AVR)
o Field Current Regulation (FCR)
o Field Voltage Regulation (FVR)
o Power Factor Regulation (PF)
o Var Regulation (var)
• Three pre-position setpoints for each excitation control mode
• Internal tracking between operating mode setpoints and external tracking of a second DECS
excitation setpoint
• Two PID stability groups with Auto Tune feature
• Remote setpoint control input accepts analog voltage or current control signal
• Real-time metering
• Optional automatic synchronizer
• Optional 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 Overexcitation: summing point and takeover
o Underexcitation
o Stator current
o Reactive power (var)
o Underfrequency
• Twenty protection functions:
o Generator undervoltage (27)
o Generator overvoltage (59)
o Loss of sensing (LOS)
o Overfrequency (81O)
o Underfrequency (81U)
o Reverse power (32R)
o Loss of excitation (40Q)
o Field overvoltage
o Field overcurrent
o Loss of PMG
o Exciter diode failure
o Sync-check (25)
o Eight configurable protection elements
• IRIG or network time synchronization
• Sixteen contact sensing inputs
o Two fixed-function inputs: Start and Stop
o Fourteen programmable inputs
- INSTRUCTION MANUAL 1
- Preface 3
- Warning! 4
- 9440500990 Rev D iii 5
- DECS-250N Preface 5
- Contents 7
- Introduction 17
- Applications 18
- Package 18
- Storage 19
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- Introduction DECS-250N 20
- Controls and Indicators 21
- Menu Navigation 22
- Adjusting Settings 23
- Display Setup 23
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- Screen Scrolling 24
- Power Inputs 25
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- Power Inputs DECS-250N 26
- Power Stage 27
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- Power Stage DECS-250N 28
- Voltage and Current Sensing 29
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- Cross-Current Compensation 30
- Bus Voltage 31
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- Synchronizer 33
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- Synchronizer DECS-250N 34
- Angle Compensation 34
- Failure of Synchronization 34
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- Generator Governor Control 39
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- 26 9440500990 Rev D 42
- Regulation DECS-250N 42
- Pre-Position Setpoints 43
- Transient Boost 44
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- DECS-250N Regulation 45
- Reactive Droop Compensation 45
- Network Load Sharing 45
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- Line Drop Compensation 46
- Autotracking 47
- Setpoint Configure 48
- Auxiliary Control 49
- Summing Type 50
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- DECS-250N Auxiliary Control 51
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- Auxiliary Control DECS-250N 52
- Contact Inputs and Outputs 53
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- Protection 57
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- Protection DECS-250N 58
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- DECS-250N Protection 59
- Generator Undervoltage 59
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- Generator Overvoltage 60
- Loss of Sensing 60
- Frequency Protection 61
- Power Protection 62
- 9440500990 Rev D 47 63
- Field Protection 64
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- Exciter Diode Monitor 66
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- Power Input Failure 68
- Sync-Check Protection 69
- Configurable Protection 70
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- Limiters DECS-250N 74
- Takeover OEL 74
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- DECS-250N Limiters 75
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- Underexcitation Limiter 77
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- Stator Current Limiter 79
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- Low-Level Limiting 80
- High-Level Limiting 80
- Initial Delay 80
- Var Limiter 81
- Limiter Scaling 81
- Underfrequency Limiter 82
- GENERATOR VOLTS 83
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- Metered Parameters 86
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- DECS-250N Metering 87
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- Metering DECS-250N 88
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- Synchronization 89
- Auxiliary Control Input 89
- Tracking 89
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- Control Panel 90
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- Metering Summary 91
- Status Indication 92
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- Outputs 94
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- Network Load Share 95
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- 9440500990 Rev D 83 99
- Real-Time Clock 99
- Auto Export Metering 100
- Event Recorder 101
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- Event Recorder DECS-250N 102
- Triggers 102
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- DECS-250N Event Recorder 103
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- Trending 105
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- Power System Stabilizer 107
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- PSS Frequency Input Signal 109
- PSS Power Input Signal 110
- P0026-21 111
- 12-09-04 111
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- Output Stage 112
- Terminal Voltage Limiter 112
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- 9440500990 Rev D 99 115
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- Stability Tuning 117
- Caution 118
- 9440500990 Rev D 103 119
- DECS-250N Stability Tuning 119
- Auto Tuning 119
- FCR and FVR Modes 120
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- FVR Mode Stability Settings 121
- Other Modes and Functions 122
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- Stability Tuning DECS-250N 124
- Mounting 125
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- Mounting DECS-250N 126
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- DECS-250N Mounting 127
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- Terminals and Connectors 131
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- Terminal Types 135
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- Typical Connections 137
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- BESTCOMSPlus 141
- Software 141
- Installation 142
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- Software DECS-250N 144
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- DECS-250N BESTCOMSPlus 145
- Menu Bars 146
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- Settings Explorer 148
- Metering Explorer 148
- Settings File Management 149
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- Automatic Metering Export 151
- Firmware Updates 151
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- Updates 154
- BESTlogic™Plus 155
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- BESTlogic™Plus DECS-250N 156
- BESTlogic™Plus Composition 156
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- DECS-250N BESTlogic™Plus 157
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- Logic Schemes 170
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- 9440500990 Rev D 157 173
- Programming BESTlogic™Plus 174
- 9440500990 Rev D 159 175
- Pickup and Dropout Timers 175
- Offline Logic Simulator 176
- BESTlogic™Plus Examples 178
- Communication 179
- Modbus™ Communication 180
- 9440500990 Rev D 165 181
- DECS-250N Communication 181
- Ethernet Port 181
- CAN Communication 182
- Ethernet Communication 183
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- Communication DECS-250N 184
- 9440500990 Rev D 169 185
- PROFIBUS Communication 186
- Configuration 187
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- Configuration DECS-250N 188
- Generator PT 188
- Generator CTs 188
- 9440500990 Rev D 173 189
- DECS-250N Configuration 189
- Operating Power Input 189
- Modes of Operation 189
- Startup Functions 190
- Device Information 191
- Display Units 192
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- Security 195
- Port Security 196
- Login and Access Controls 197
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- Security DECS-250N 198
- Login Failure 198
- Timekeeping 199
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- Timekeeping DECS-250N 200
- 9440500990 Rev D 185 201
- DECS-250N Timekeeping 201
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- Testing 203
- Frequency Response 204
- 9440500990 Rev D 189 205
- DECS-250N Testing 205
- Bode Plotting 205
- Transfer Function 205
- Time Response 206
- 9440500990 Rev D 191 207
- Signal Input 207
- Test Signal Characteristics 207
- Step Response Analysis 208
- Analysis Options 209
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- Testing DECS-250N 210
- CAN Parameters 211
- 196 9440500990 Rev D 212
- CAN Communication DECS-250N 212
- 9440500990 Rev D 197 213
- DECS-250N CAN Communication 213
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- Modbus Modes of Operation 216
- 9440500990 Rev D 201 217
- Modbus on TCP/IP 217
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- 9440500990 Rev D 203 219
- Read Holding Registers 219
- Return Query Data 219
- 204 9440500990 Rev D 220
- Listen Only Mode 220
- Preset Multiple Registers 220
- 9440500990 Rev D 205 221
- Preset Single Register 221
- Data Formats 222
- Modbus Parameters 224
- 9440500990 Rev D 209 225
- Binary Points 225
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- Metering 234
- 9440500990 Rev D 219 235
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- 9440500990 Rev D 223 239
- Limiters 239
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- 9440500990 Rev D 225 241
- Setpoints 241
- 226 9440500990 Rev D 242
- 9440500990 Rev D 227 243
- Global Settings 243
- 228 9440500990 Rev D 244
- Relay Settings 244
- 9440500990 Rev D 229 245
- 230 9440500990 Rev D 246
- Protection Settings 246
- 9440500990 Rev D 231 247
- 232 9440500990 Rev D 248
- Gains Settings 248
- 9440500990 Rev D 233 249
- Legacy Modbus 249
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- 9440500990 Rev D 245 261
- PROFIBUS Parameters 262
- 9440500990 Rev D 247 263
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- 9440500990 Rev D 249 265
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- 302 9440500990 Rev D 318
- Maintenance 319
- Troubleshooting 320
- Support 321
- 306 9440500990 Rev D 322
- Maintenance DECS-250N 322
- Specifications 323
- Generator Current Sensing 324
- Accessory Inputs 325
- Contact Inputs 325
- Communication Ports 325
- Contact Outputs 326
- Field Power Output 327
- Regulation 327
- Parallel Compensation 328
- Field Protection Functions 329
- Startup 330
- Voltage Matching 331
- Data Logging (Oscillography) 332
- Environment 332
- Type Tests 332
- Physical 333
- Regulatory Standards 333
- 318 9440500990 Rev D 334
- Specifications DECS-250N 334
- Analog Expansion Module 335
- 322 9440500990 Rev D 338
- Connections 338
- 324 9440500990 Rev D 340
- AEM-2020 341
- 9440500990 Rev D 327 343
- Communications 344
- Functional Description 344
- 9440500990 Rev D 329 345
- RTD Inputs 345
- 330 9440500990 Rev D 346
- Thermocouple Inputs 346
- 9440500990 Rev D 331 347
- Analog Outputs 347
- 9440500990 Rev D 333 349
- Analog Input Values 349
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- 336 9440500990 Rev D 352
- Contact Expansion Module 353
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- 9440500990 Rev D 347 363
- Revision History 365
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