Basler-electric DECS-400 User Manual Page 13
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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-defined PSS2A, dual-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 detail.
• 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
- INSTRUCTION MANUAL 1
- Preface 3
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- 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
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- DECS-400 BESTCOMS™ Software 127
- Installation 133
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- Installation DECS-400 134
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- 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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