Basler-electric DECS-400 User Manual Page 42
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field current (FCR) or the level of field voltage (FVR). Manual contact input connections are made at
terminals B6 (MAN) and B5 (COM).
Raise
This input increases the active, operating setpoint. The raise setpoint function is active as long as the
contact is closed. The raise increment is a function of the setpoint range of adjustment and the active
mode traverse rate. The increments are directly proportional to the adjustment range and inversely
proportional to the traverse rate. This input has no effect when the active pre-position mode is Maintain.
Raise contact input connections are made at terminals B7 (RAISE) and B8 (COM).
Lower
This input decreases the active, operating setpoint. The lower setpoint function is active as long as the
contact is closed. The lower increment is a function of the setpoint range of adjustment and the active
mode traverse rate. The increments are directly proportional to the adjustment range and inversely
proportional to the traverse rate. This input has no effect when the active pre-position mode is Maintain.
Lower contact input connections are made at terminals B9 (LOWER) and B8 (COM).
Start
This input accepts a momentary contact closure that enables the DECS-400. If the DECS-400 receives
Start and Stop contact inputs simultaneously, the Stop input has priority. Start contact input connections
are made at terminals B1 (START) and B2 (COM).
Stop
This input accepts a momentary contact closure that disables the DECS-400. If the DECS-400 receives
Stop and Start contact inputs simultaneously, the Stop input has priority. Stop contact input connections
are made at terminals B3 (STOP) and B2 (COM).
SW1 – SW10
These user-programmable inputs can be connected to monitor the status of excitation system contacts
and switches. Then, using BESTCOMS, these inputs can be used as part of a user-configured logic
scheme to control and annunciate a variety of system conditions and contingencies. Information about
using SW1 through SW10 is provided in the BESTCOMS Software chapter.
Digital Signal Processor
The digital signal processor (DSP) supports measurement, control (output and converters), metering
functions, and filtering. It controls both the analog-to-digital converter (ADC) and the digital-to-analog
converter (DAC). All analog input signals from the ADC are filtered by finite impulse response (FIR) filters.
AC signals are also filtered by infinite impulse response (IIR) filters, and dc signals (field voltage and
current) are filtered by averaging filters. Output data to the DAC are used to generate the control output
signals.
Microprocessor
The microprocessor performs control, measurement, computation, self-test, and communication functions
by using its embedded programming (firmware) and the nonvolatile settings stored in its memory.
IRIG Port
When a valid time code signal is detected at the IRIG port, it automatically synchronizes the DECS-400’s
internal clock with the time code signal. Because the IRIG time code signal does not contain year
information, it is necessary for the user to enter the date even when using an IRIG source. Year
information is stored in nonvolatile memory so that when operating power is restored after an outage and
the clock is re-synchronized, the current year is restored.
The IRIG input is fully isolated and accepts a demodulated (dc level-shifted) signal. For proper
recognition, the IRIG signal applied to the DECS-400 must have a logic high level of no less than 3.5 Vdc
and a logic low level that is no higher than 0.5 Vdc. The input signal voltage range is –10 Vdc to +10 Vdc.
Functional Description DECS-400
- 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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