Brief Product Description

The Basler DECS-200 is a microprocessor-based digital excitation controller built for synchronous generators. It adopts PWM power stage technology and delivers precise generator terminal voltage and reactive power regulation with ±0.25% regulation accuracy. Supporting multiple DC excitation output ratings of 32Vdc, 63Vdc and 125Vdc at 15Adc continuous current, it features true RMS single/three-phase measurement, local HMI operation and PC configuration via BESTCOMS software. Equipped with comprehensive limiters, generator protection and Modbus RTU communication, this compact controller is widely used for genset excitation management. Fully tested surplus and refurbished DECS-200 units are available for maintenance and retrofit of existing generator excitation systems.

Core Product Functions

• Four main control modes: AVR automatic voltage regulation, field current regulation, VAR control and power factor control
• High precision true RMS voltage sensing for single-phase or three-phase generator measurement
• Integrated over-excitation, under-excitation, V/Hz and stator current limit protection functions
• Reactive droop compensation and voltage matching for generator paralleling operation
• Adjustable soft-start voltage ramp for smooth generator voltage build-up during startup
• Sequence of event recording and oscillography for fault diagnosis and performance analysis
• Backlit LCD keypad for local parameter setup and real-time generator status monitoring
• Modbus RTU communication interface for connection to SCADA, DCS and remote monitoring systems
• Exciter diode monitoring and multiple generator protective functions against overvoltage, undervoltage and sensing loss

Application Scenarios

• Industrial diesel, gas and biogas synchronous generator excitation control
• Small and medium hydroelectric power plant generator voltage regulation
• Utility substations, captive power plants and backup emergency gensets
• Oil & gas, mining, metallurgy and manufacturing on-site power generation systems
• Marine generator sets with DNV certification for vessel power management
• Legacy excitation cabinet maintenance, controller replacement and system retrofitting projects

FAQ (Frequently Asked Questions)

• Q: Generator voltage becomes unstable after installing BASLER DECS-200?
  A: Check PT sensing wiring, excitation power wiring, PID stability parameters, droop setting and verify for loose connections or distorted generator signals.
• Q: What software is used to program the DECS-200 controller?
  A: BESTCOMS software for Windows PC is used for parameter configuration, oscillography capture and firmware management.
• Q: Can DECS-200 be used for parallel generator operation?
  A: Yes, it supports reactive droop compensation and voltage matching to synchronize multiple generators running in parallel on the grid.
• Q: What protection features does DECS-200 include?
  A: It includes overexcitation, underexcitation, V/Hz limiter, overvoltage, undervoltage, loss of sensing and exciter diode monitoring protection.
• Q: Is BASLER DECS-200 available for brand-new power plant projects?
  A: This legacy digital excitation controller has reached end-of-life. Only fully tested surplus and refurbished units are supplied for existing generator system maintenance and retrofits.