Basler Electric DECS-400 User Manual
Instruction manual, For decs-400 digital excitation control system
Table of contents
Document Outline
- DECS-400
- Preface
- Contents
- General Information
- Features
- Generator Voltage Regulation
- Control Output
- Stability
- Power System Stabilizer (Style 1XXX)
- Underfrequency Limiter or Volts per Hertz Limiter
- Soft-Start Voltage Buildup
- Reactive Droop and Line Drop Compensation
- Setpoint Control
- Dual Pre-Position Inputs
- Manual Operating Modes
- Var/Power Factor Operating Mode
- Overexcitation Limiters
- Minimum Excitation Limiter
- Stator Current Limiter
- Reactive Power Limiter
- Autotracking Between DECS-400 Operating Modes
- Autotracking Between DECS-400 Units
- Protective Functions
- Programmable Logic
- Metering
- Sequence of Events Recording
- Oscillography
- Real-Time Monitoring
- Internal Testing Provisions
- Communication
- Password Protection
- Upgrading from DECS-300 to DECS-400
- Model and Style Number
- Features
- Human-Machine Interface
- Functional Description
- DECS-400 Function Blocks
- Analog Input Circuits
- Front Panel Keyboard
- Contact Input Circuits
- Digital Signal Processor
- Microprocessor
- IRIG Port
- Memory Circuits
- Digital to Analog Converter
- Control Output Circuits
- Meter Driver Circuits
- Relay Output Contacts
- Front Panel LEDs
- Front Panel LCD
- RS-232 Communication Port
- RS-485 Communication Ports
- Ethernet Port
- Modem
- Power Supply
- Startup Functions
- Control Modes
- Protection Functions
- Field Overcurrent
- Field Overvoltage
- Generator Undervoltage
- Generator Overvoltage
- Loss of Sensing Voltage
- Loss of Field Isolation Transducer
- Generator Frequency Less Than 10 Hertz
- Power Supply Low
- Loss of Field (40Q)
- Field Overtemperature
- Volts per Hertz (24)
- Exciter Diode Monitor (EDM)
- Voltage / Current Unbalance Detection
- Limiter Functions
- Operation with Paralleled Generators
- Autotracking
- Data Recording and Reporting
- Power System Stabilizer
- Field Isolation Module
- DECS-400 Function Blocks
- BESTCOMS™ Software
- Installation
- Commissioning
- Maintenance
- Storage
- Warranty and Repair Service
- Troubleshooting
- DECS-400 Appears Inoperative
- Display Blank or Frozen
- Generator Voltage Does Not Build
- Generator Voltage Builds but DECS-400 Fails To Flash
- Field Voltage or Current Reading on LCD Does Not Change
- Low Generator Voltage (In AVR Mode)
- High Generator Voltage (In AVR Mode)
- Generator Voltage Unstable (Hunting)
- Poor Voltage Regulation
- No Buildup in FCR Mode
- No Control Signal at Firing Circuit Input
- Limiters Do Not Limit at the Desired Level
- Poor Reactive Control
- Protection or Limit Annunciation
- Metering Readings Incorrect
- No Communication
- Real-Time Clock Information Lost After Loss of Control Power
- DECS-400 Reboots Frequently
- Backup Battery Replacement
- Upgrading DECS-400 Firmware
- Specifications
- Operating Power
- Generator Voltage Sensing
- Bus Voltage Sensing
- Generator Current Sensing
- Field Voltage and Current
- Field Isolation Module
- Contact Inputs
- Accessory Input (Remote Setpoint Control)
- Control Outputs
- Metering Outputs
- Contact Outputs
- Communication Ports
- IRIG
- Regulation Accuracy
- Metering Accuracy
- Power System Stabilizer (PSS)
- Traverse Rates
- Setpoint Tracking
- Soft Start
- Sequence of Events Recording
- Data Logging (Oscillography)
- Trending
- Limiters
- Protection Functions
- Type Tests
- Agency Certifications
- Real-Time Clock Battery
- Environment
- Physical
- Programmable Logic
- Modbus™ Communication
- DECS-400 Modbus™ Protocol
- Message Structure
- Modbus Modes of Operation
- Serial Transmission Details
- Communication Hardware Requirements
- Modbus™/TCP
- Detailed Message Query and Response
- Read Holding Registers
- Preset Multiple Registers
- Preset Single Register (Write Single Holding Register)
- Response
- Loop Back Diagnostic Test (FC=8) with Diagnostic Sub Function, Return Query Data
- Loop Back Diagnostic Test with Diagnostic Sub-Function, Restart Communications Option
- Loop Back Diagnostic Test with Diagnostic Sub-Function, Force Slave to Listen-Only Mode
- Data Formats
- CRC Error Check
- DECS-400 Modbus™ Register Space
- DECS-400 Register Tables
- Holding Registers for Version Data
- Holding Registers for Metering, Group 1
- Holding Registers for System Configuration
- Holding Registers for Operating Mode Parameters
- Holding Registers for Setpoint Parameters
- Holding Registers for Startup Parameters
- Holding Registers for Limiter Parameters
- Holding Registers for Gain Parameters
- Holding Registers for Protection Function Parameters
- Holding Registers for Exciter Diode Monitor Parameters
- Holding Registers for Relay Parameters
- Holding Registers for General ASCII and Modbus Communication Parameters
- Holding Registers for Metering Parameters, Group 2
- Holding Registers for Power System Stabilizer Parameters
- Revision History