Basler-electric DECS-400 User Manual Page 43
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Input resistance is nonlinear and approximately 4 kΩ at 3.5 Vdc and 3 kΩ at 20 Vdc. IRIG signal
connections are made at terminals D1 (IRIG+) and D2 (IRIG–).
Memory Circuits
The DECS-400 has three types of memory circuits: flash memory, random access memory (RAM), and
electrically-erasable, programmable, read-only memory (EEPROM). Flash memory is nonvolatile and
retains the operating software (firmware). RAM is volatile and serves as temporary storage for data.
EEPROM is nonvolatile and stores DECS-400 settings.
Digital to Analog Converter
Digital input data from the digital signal processor (DSP) is converted by the digital-to-analog converter
(DAC) into analog signals for controlling the excitation level. Output data from the DAC may be either a
voltage signal or current signal. Signal selection is made through BESTCOMS or the front panel HMI.
A second pair of DACs supply metering signals to the DECS-400 meter driver output terminals.
Control Output Circuits
Analog signals from the DAC are output to switches controlled by the DSP. There are three control signal
options. A control signal over the range of 0 to 10 Vdc, –10 to 10 Vdc, or 4 to 20 mAdc may be selected.
Control signal selection is made through BESTCOMS or the front panel HMI.
Meter Driver Circuits
Two analog signals from a second DAC are output from the microprocessor. A meter driver signal over
the range of 4 to 20 mAdc may be configured to represent one of the DECS-400 metered values. Each
driver circuit can be configured for a different metered value and configured to represent a specific range
of the metered value. The parameters available for metering are listed below:
• Auxiliary Voltage Input
• AVR PID Error Signal Input
• Bus Frequency
• Bus Voltage
• Comp. Freq. Deviation
• Control Output
• Cross Current Input
• Field Current
• Field Temperature
• Field Voltage
• Frequency Response
• Generator Apparent Power
• Generator Average Current
• Generator Average Voltage
• Generator Current Ia
• Generator Current Ib
• Generator Current Ic
• Generator Frequency
• Generator Power Factor
• Generator Reactive Power
• Generator Real Power
• Generator Voltage Vab
• Generator Voltage Vbc
• Generator Voltage Vca
• Negative Sequence Current
• Neg. Sequence Voltage
• Null Balance Level
• OEL Controller Output
• PF Mode Output
• Phase Angle Ia – Vca
• Phase Angle Iaux – Vca
• Phase Angle Ib – Vca
• Phase Angle Ic – Vca
• Phase Angle Vab
• Phase Angle Vbc
• PID Integrator State
• Position Indication
• Positive Sequence Current
• Positive Sequence Voltage
• PSS Electrical Power
• PSS Filtered Mech. Power
• PSS Final Output
• PSS Lead-Lag #1
• PSS Lead-Lag #2
• PSS Lead-Lag #3
• PSS Lead-Lag #4
• PSS Mechanical Power
• PSS Mech. Power LP #1
• PSS Mech. Power LP #2
• PSS Mech. Power LP #3
• PSS Mech. Power LP #4
• PSS Post-Limit Output
• PSS Power HP #1
• PSS Pre-Limit Output
• PSS Speed HP #1
• PSS Synthesized Speed
• PSS Terminal Voltage
• PSS Torsional Filter #1
• PSS Torsional Filter #2
• PSS Washed Out Power
• PSS Washed Out Speed
• Rate of Frequency Change
• SCL Controller Output
• Terminal Freq. Deviation
• Time Response
• UEL Controller Output
• Var Limiter Output
Relay Output Contacts
DECS-400 output contacts consist of a dedicated On/Off output, a dedicated Watchdog output, and six
programmable outputs.
DECS-400 Functional Description
- INSTRUCTION MANUAL 1
- Preface 3
- 9369700990 Rev R iii 5
- DECS-400 Preface 5
- Contents 7
- General Information 13
- Generator Voltage Regulation 14
- Control Output 14
- Stability 14
- Overexcitation Limiters 16
- Minimum Excitation Limiter 16
- Stator Current Limiter 16
- Reactive Power Limiter 17
- Protective Functions 17
- Programmable Logic 17
- Model and Style Number 19
- Human-Machine Interface 21
- Menu System 22
- Editing Settings 32
- Password Protection 33
- Metering Screen 34
- Setpoint 35
- Percent of Range 35
- Alarms Message 36
- Operating Mode 37
- Functional Description 39
- Front Panel Keyboard 41
- Contact Input Circuits 41
- Digital Signal Processor 42
- Microprocessor 42
- IRIG Port 42
- Memory Circuits 43
- Digital to Analog Converter 43
- Control Output Circuits 43
- Meter Driver Circuits 43
- Relay Output Contacts 43
- Front Panel LEDs 44
- Front Panel LCD 44
- RS-232 Communication Port 44
- RS-485 Communication Ports 44
- Startup Functions 45
- Control Modes 46
- Field Overvoltage 50
- Generator Undervoltage 50
- Generator Overvoltage 50
- Loss of Sensing Voltage 50
- Power Supply Low 51
- Loss of Field (40Q) 51
- Field Overtemperature 52
- Volts per Hertz (24) 52
- MEASURED 53
- Exciter Diode Monitor (EDM) 54
- Limiter Functions 55
- Overexcitation Limiter 56
- TIME IN SECONDS 57
- Underexcitation Limiter 58
- (0.49 x kW 59
- 1.0) x kvar_level 59
- Underfrequency Limiter 59
- GENERATOR VOLTS 60
- Var Limiter 61
- Limiter Scaling 61
- Droop Compensation 61
- Reactive Differential 61
- Line Drop Compensation 61
- Autotracking 62
- Data Recording and Reporting 62
- Data Logging 63
- Power System Stabilizer 64
- PSS Theory of Operation 65
- Figure 19. Speed Signal 66
- Stabilizing 67
- Compensation 67
- SSW 5SSW 4 67
- P0026-21 68
- 12-09-04 68
- Figure 26. Output Stage 69
- BESTCOMS™ Software 71
- Communication 73
- Modem Communication 75
- System Configuration 75
- Settings 83
- Gain Settings 89
- Figure 44. PID Calculator 90
- Protection 100
- Metering 110
- Data Log 114
- 9.22936 ×= 121
- Analysis 123
- Caution 126
- 9369700990 Rev R 115 127
- DECS-400 BESTCOMS™ Software 127
- Installation 133
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- Installation DECS-400 134
- 9369700990 Rev R 123 135
- DECS-400 Installation 135
- Connections 137
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- Table 13. IRIG Terminals 141
- Cross-Current Compensation 144
- Typical Interconnections 145
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- Communication Connections 148
- P0026-01 149
- 10-01-04 149
- Commissioning 151
- Warning! 154
- Recommended PSS Testing 159
- Maintenance 161
- Backup Battery Replacement 164
- Upgrading DECS-400 Firmware 164
- Specifications 169
- Generator Current Sensing 170
- Field Voltage and Current 170
- Field Isolation Module 170
- Contact Inputs 170
- Control Outputs 171
- Metering Outputs 172
- Contact Outputs 172
- Communication Ports 172
- Regulation Accuracy 173
- Metering Accuracy 174
- Traverse Rates 174
- Setpoint Tracking 174
- Soft Start 175
- Sequence of Events Recording 175
- Data Logging (Oscillography) 175
- Trending 175
- Limiters 175
- Underexcitation 176
- Protection Functions 177
- Type Tests 178
- Agency Certifications 178
- Real-Time Clock Battery 178
- Environment 179
- Physical 179
- Logic Schemes 182
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- DECS-400 Programmable Logic 183
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- Programmable Logic DECS-400 184
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- Logic Scheme Modification 196
- Logic Definitions 207
- Outputs 210
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- Relay Output 1 through 6 214
- Modbus™ Communication 215
- Modbus Modes of Operation 216
- Serial Transmission Details 216
- Modbus™/TCP 218
- Preset Multiple Registers 219
- Response 220
- Data Formats 221
- Generic Types UI8 and I8 222
- Generic Types UI16 and I16 222
- Generic Types UI32 and I32 222
- CRC Error Check 223
- DECS-400 Register Tables 225
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- Revision History 243
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