Basler-electric DECS-250N User Manual Page 170
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154 9440500990 Rev D
BESTlogic™Plus DECS-250N
Name Description Symbol
VAR LIMITER
SELECT
SECONDARY
SETTINGS
When true, this elements selects the
secondary settings on the Var limiter.
VAR/PF MODE The var input selects var control and the PF
input selects power factor control.
VAR/PF SELECT
ENABLE
When true, this element allows the selection of
Var and PF.
VOLTAGE
MATCHING
DISABLE
When true, this element disables voltage
matching when the unit is operating in AVR
mode.
Logic Schemes
A logic scheme is a group of logic variables written in equation form that defines the operation of a
DECS-250N Digital Excitation System. Each logic scheme is given a unique name. This gives you the
ability to select a specific scheme and be confident that the selected scheme is in operation. One logic
scheme is configured for a typical protection and control application of a synchronous generator and is
the default active logic scheme. Only one logic scheme can be active at a given time. In most
applications, preprogrammed logic schemes eliminate the need for custom programming.
Preprogrammed logic schemes may provide more inputs, outputs, or features than are needed for a
particular application. This is because a preprogrammed scheme is designed for a large number of
applications with no special programming required. Unneeded logic block outputs may be left open to
disable a function or a function block can be disabled through operating settings.
When a custom logic scheme is required, programming time is reduced by modifying the default logic
scheme.
The Active Logic Scheme
The DECS-250N must have an active logic scheme in order to function. All DECS-250N controllers are
delivered with a default, active logic scheme preloaded in memory. The functionality of this logic scheme
is similar to the scheme provided with the DECS-200N. If the function block configuration and output logic
of the default logic scheme meet the requirements of your application, then only the operating settings
(system parameters and threshold settings) need to be adjusted before placing the DECS-250N in
service.
Sending and Retrieving Logic Schemes
Retrieving a Logic Scheme from the DECS-250N
To retrieve settings from the DECS-250N, the DECS-250N must be connected to a computer through a
communications port. Once the necessary connections are made, settings can be downloaded from the
DECS-250N by selecting Download Settings and Logic on the Communication pull-down menu.
- 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
- 4 9440500990 Rev C 20
- Introduction DECS-250N 20
- Controls and Indicators 21
- Menu Navigation 22
- Adjusting Settings 23
- Display Setup 23
- 8 9440500990 Rev D 24
- Screen Scrolling 24
- Power Inputs 25
- 10 9440500990 Rev D 26
- Power Inputs DECS-250N 26
- Power Stage 27
- 12 9440500990 Rev D 28
- Power Stage DECS-250N 28
- Voltage and Current Sensing 29
- 14 9440500990 Rev D 30
- Cross-Current Compensation 30
- Bus Voltage 31
- 16 9440500990 Rev D 32
- Synchronizer 33
- 18 9440500990 Rev D 34
- Synchronizer DECS-250N 34
- Angle Compensation 34
- Failure of Synchronization 34
- 22 9440500990 Rev D 38
- Generator Governor Control 39
- 24 9440500990 Rev D 40
- 26 9440500990 Rev D 42
- Regulation DECS-250N 42
- Pre-Position Setpoints 43
- Transient Boost 44
- 9440500990 Rev D 29 45
- DECS-250N Regulation 45
- Reactive Droop Compensation 45
- Network Load Sharing 45
- 30 9440500990 Rev D 46
- Line Drop Compensation 46
- Autotracking 47
- Setpoint Configure 48
- Auxiliary Control 49
- Summing Type 50
- 9440500990 Rev D 35 51
- DECS-250N Auxiliary Control 51
- 36 9440500990 Rev D 52
- Auxiliary Control DECS-250N 52
- Contact Inputs and Outputs 53
- 9440500990 Rev D 39 55
- 40 9440500990 Rev D 56
- Protection 57
- 42 9440500990 Rev D 58
- Protection DECS-250N 58
- 9440500990 Rev D 43 59
- DECS-250N Protection 59
- Generator Undervoltage 59
- 44 9440500990 Rev D 60
- Generator Overvoltage 60
- Loss of Sensing 60
- Frequency Protection 61
- Power Protection 62
- 9440500990 Rev D 47 63
- Field Protection 64
- 9440500990 Rev D 49 65
- 50 9440500990 Rev D 66
- Exciter Diode Monitor 66
- 9440500990 Rev D 51 67
- 52 9440500990 Rev D 68
- Power Input Failure 68
- Sync-Check Protection 69
- Configurable Protection 70
- 9440500990 Rev D 55 71
- 56 9440500990 Rev D 72
- 58 9440500990 Rev D 74
- Limiters DECS-250N 74
- Takeover OEL 74
- 9440500990 Rev D 59 75
- DECS-250N Limiters 75
- 60 9440500990 Rev D 76
- Underexcitation Limiter 77
- 62 9440500990 Rev D 78
- Stator Current Limiter 79
- 64 9440500990 Rev D 80
- Low-Level Limiting 80
- High-Level Limiting 80
- Initial Delay 80
- Var Limiter 81
- Limiter Scaling 81
- Underfrequency Limiter 82
- GENERATOR VOLTS 83
- 68 9440500990 Rev D 84
- Metered Parameters 86
- 9440500990 Rev D 71 87
- DECS-250N Metering 87
- 72 9440500990 Rev D 88
- Metering DECS-250N 88
- 9440500990 Rev D 73 89
- Synchronization 89
- Auxiliary Control Input 89
- Tracking 89
- 74 9440500990 Rev D 90
- Control Panel 90
- 9440500990 Rev D 75 91
- Metering Summary 91
- Status Indication 92
- 9440500990 Rev D 77 93
- 78 9440500990 Rev D 94
- Outputs 94
- 9440500990 Rev D 79 95
- Network Load Share 95
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- 9440500990 Rev D 81 97
- 82 9440500990 Rev D 98
- 9440500990 Rev D 83 99
- Real-Time Clock 99
- Auto Export Metering 100
- Event Recorder 101
- 86 9440500990 Rev D 102
- Event Recorder DECS-250N 102
- Triggers 102
- 9440500990 Rev D 87 103
- DECS-250N Event Recorder 103
- 88 9440500990 Rev D 104
- Trending 105
- 90 9440500990 Rev D 106
- Power System Stabilizer 107
- 92 9440500990 Rev D 108
- PSS Frequency Input Signal 109
- PSS Power Input Signal 110
- P0026-21 111
- 12-09-04 111
- 96 9440500990 Rev D 112
- Output Stage 112
- Terminal Voltage Limiter 112
- 9440500990 Rev D 97 113
- 98 9440500990 Rev D 114
- 9440500990 Rev D 99 115
- 100 9440500990 Rev D 116
- Stability Tuning 117
- Caution 118
- 9440500990 Rev D 103 119
- DECS-250N Stability Tuning 119
- Auto Tuning 119
- FCR and FVR Modes 120
- 9440500990 Rev D 105 121
- FVR Mode Stability Settings 121
- Other Modes and Functions 122
- 9440500990 Rev D 107 123
- 108 9440500990 Rev D 124
- Stability Tuning DECS-250N 124
- Mounting 125
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- Mounting DECS-250N 126
- 9440500990 Rev D 111 127
- DECS-250N Mounting 127
- 112 9440500990 Rev D 128
- 9440500990 Rev D 113 129
- 114 9440500990 Rev D 130
- Terminals and Connectors 131
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- 9440500990 Rev D 117 133
- 118 9440500990 Rev D 134
- Terminal Types 135
- 120 9440500990 Rev D 136
- Typical Connections 137
- 122 9440500990 Rev D 138
- 9440500990 Rev D 123 139
- 124 9440500990 Rev D 140
- BESTCOMSPlus 141
- Software 141
- Installation 142
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- Software DECS-250N 144
- 9440500990 Rev D 129 145
- DECS-250N BESTCOMSPlus 145
- Menu Bars 146
- 9440500990 Rev D 131 147
- Settings Explorer 148
- Metering Explorer 148
- Settings File Management 149
- 134 9440500990 Rev D 150
- Automatic Metering Export 151
- Firmware Updates 151
- 9440500990 Rev D 137 153
- Updates 154
- BESTlogic™Plus 155
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- BESTlogic™Plus DECS-250N 156
- BESTlogic™Plus Composition 156
- 9440500990 Rev D 141 157
- DECS-250N BESTlogic™Plus 157
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- 9440500990 Rev D 153 169
- Logic Schemes 170
- 156 9440500990 Rev D 172
- 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
- 168 9440500990 Rev D 184
- Communication DECS-250N 184
- 9440500990 Rev D 169 185
- PROFIBUS Communication 186
- Configuration 187
- 172 9440500990 Rev D 188
- 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
- 9440500990 Rev D 177 193
- 178 9440500990 Rev D 194
- Security 195
- Port Security 196
- Login and Access Controls 197
- 182 9440500990 Rev D 198
- Security DECS-250N 198
- Login Failure 198
- Timekeeping 199
- 184 9440500990 Rev D 200
- Timekeeping DECS-250N 200
- 9440500990 Rev D 185 201
- DECS-250N Timekeeping 201
- 186 9440500990 Rev D 202
- 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
- 194 9440500990 Rev D 210
- 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
- 198 9440500990 Rev D 214
- Modbus Modes of Operation 216
- 9440500990 Rev D 201 217
- Modbus on TCP/IP 217
- 202 9440500990 Rev D 218
- 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
- 210 9440500990 Rev D 226
- 9440500990 Rev D 211 227
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- 9440500990 Rev D 213 229
- 214 9440500990 Rev D 230
- 9440500990 Rev D 215 231
- 216 9440500990 Rev D 232
- 9440500990 Rev D 217 233
- 218 9440500990 Rev D 234
- Metering 234
- 9440500990 Rev D 219 235
- 220 9440500990 Rev D 236
- 9440500990 Rev D 221 237
- 222 9440500990 Rev D 238
- 9440500990 Rev D 223 239
- Limiters 239
- 224 9440500990 Rev D 240
- 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
- 234 9440500990 Rev D 250
- 9440500990 Rev D 235 251
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- 240 9440500990 Rev D 256
- 9440500990 Rev D 241 257
- 242 9440500990 Rev D 258
- 244 9440500990 Rev D 260
- 9440500990 Rev D 245 261
- PROFIBUS Parameters 262
- 9440500990 Rev D 247 263
- 248 9440500990 Rev D 264
- 9440500990 Rev D 249 265
- 250 9440500990 Rev D 266
- 9440500990 Rev D 251 267
- 252 9440500990 Rev D 268
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- 9440500990 Rev D 299 315
- 300 9440500990 Rev D 316
- 9440500990 Rev D 301 317
- 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
- 334 9440500990 Rev D 350
- 336 9440500990 Rev D 352
- Contact Expansion Module 353
- 340 9440500990 Rev D 356
- 9440500990 Rev D 341 357
- 9440500990 Rev D 343 359
- 344 9440500990 Rev D 360
- 9440500990 Rev D 345 361
- 9440500990 Rev D 347 363
- Revision History 365
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