BASLER DECS-200-1L Digital Excitation Control System

Overview

The BASLER DECS‑200‑1L is a high-performance digital excitation controller designed for precise voltage and current regulation in synchronous generators and motors. This compact system integrates automatic voltage regulation, field current and voltage control, and advanced monitoring functions, significantly reducing external control complexity. Moreover, its support for power factor and VAR control makes it adaptable to industrial, marine, and utility applications, ensuring stable generator performance under varying load conditions.

In addition to its core regulation capabilities, the DECS‑200‑1L includes integrated protection against over/under voltage, over/under frequency, field overcurrent, reverse power, and loss of sensing. Therefore, it provides both operational reliability and system safety in critical power environments. Engineers and plant operators value its flexibility, which allows seamless integration into existing systems while maintaining compliance with modern grid standards.

Key Features and Benefits

• Automatic Voltage Regulation (AVR) with ±0.25% accuracy across full load range

• Field current and voltage regulation with manual override for flexible control

• Power factor and VAR control modes for optimized generator performance

• Integrated protection for voltage, frequency, field current, and reverse power

• True RMS single-phase or three-phase voltage sensing for precise measurement

• Optional Power System Stabilizer (PSS) for grid compliance and enhanced stability

• Compact design consolidates multiple functions, reducing installation complexity

• RS‑232/RS‑485 communication and optional Ethernet for remote monitoring

Technical Specifications

Manufacturer: Basler Electric
Model: DECS‑200‑1L
Series: DECS‑200 Digital Excitation Control System
Product Type: Generator Excitation Controller

Functions:

• Automatic Voltage Regulation (AVR)

• Field Current Regulation

• Field Voltage Regulation

• Power Factor and VAR Control

Voltage Sensing: True RMS, single-phase or three-phase
Control Modes: Automatic Voltage, Manual Field Current, Manual Field Voltage, VAR, Power Factor
Integrated Protection: Over/under voltage, over/under frequency, loss of sensing, field overcurrent, reverse power, VAR limit
Communication: RS‑232 (ASCII), RS‑485 (Modbus™), optional Ethernet
Output Capability: 32 Vdc, 63 Vdc, or 125 Vdc at up to 15 Adc
AVR Regulation Accuracy: ±0.25% over load range at rated power factor
Control Power Options:

• 16–60 Vdc, burden 30 W

• 85–132 Vac (50/60 Hz), burden 50 VA

• 90–150 Vdc, burden 30 W
  Operating Frequency Range: 50–400 Hz (up to 500 Hz depending on revision)
  Generator Voltage Sensing: Single-phase or three-phase, four selectable ranges
  Stability Selections: 20 standard, plus user-customizable
  Power Input: 1 or 3-phase, 11/20 Amp, 56–277 Vac (50–400 Hz)
  Weight: 5.90 kg

Typical Applications

The DECS‑200‑1L is ideal for industrial plants, power stations, and marine environments. For instance, it regulates generator excitation on turbines, motors, and synchronous alternators, ensuring consistent voltage output under fluctuating loads. In addition, it is suitable for retrofitting older generators or integrating into new installations, providing modern monitoring and protection features.

FAQ

Q: What type of generators is DECS‑200‑1L compatible with?
A: It is compatible with synchronous generators and motors in industrial, marine, and utility environments.

Q: Can it operate in both single-phase and three-phase systems?
A: Yes, the controller supports true RMS sensing for both single-phase and three-phase voltage inputs.

Q: Does the unit provide remote monitoring capabilities?
A: Yes, it includes RS‑232, RS‑485 communication ports and optional Ethernet for remote monitoring and configuration.

Q: What protections are built into the DECS‑200‑1L?
A: It provides over/under voltage, over/under frequency, field overcurrent, reverse power, VAR limit, and loss of sensing protections.

Q: Is the controller suitable for grid compliance applications?
A: Yes, it offers an optional Power System Stabilizer (PSS) to support grid compliance and enhance stability.