Product Description

Overview

The Basler DECS-200-2L (Part Number: DECS-200-2L) is a high-performance digital excitation control module designed to regulate the DC field current of synchronous generators. It delivers precise voltage regulation, advanced reactive power control, and integrated generator protection, ensuring stable operation across a wide range of generator types, from conventional thermal units to renewable energy installations.

Core Features

• Microprocessor-Based Control: Provides real-time voltage and current monitoring to maintain optimal generator excitation.

• Wide Input Voltage: Operates with 100–240 VAC supply for versatile installation.

• High Output Capability: Up to 125 VDC output and 20 A maximum current for high-capacity generators.

• Precision Regulation: Maintains voltage within ±0.25% of the setpoint.

• Flexible Communication: Supports RS-232, RS-485, Modbus™, DeviceNet, and Ethernet protocols for SCADA or DCS integration.

• Rugged Design: IP65 protection and wide operating temperature (-20°C to +70°C) for harsh industrial environments.

• Compact Form Factor: Lightweight and space-saving, dimensions 140 x 100 x 60 mm, ideal for generator control cabinets.

Technical Description

The DECS-200-2L functions as a digital Automatic Voltage Regulator (AVR) that continuously monitors generator output and adjusts the excitation current to maintain stability under varying load conditions. Its True RMS sensing ensures accurate voltage measurement even in non-linear or high-harmonic environments.

• Control Modes: Automatic Voltage Regulation (AVR), Field Current Regulation (FCR), Constant Reactive Power (VAR), Constant Power Factor (PF).

• Redundancy Options: Supports Master/Follower configuration for seamless transfer in dual-exciter systems.

• Power Stage: PWM-based output provides fast response and efficient field control.

Performance Characteristics

1. Accurate Voltage Regulation

• Maintains generator voltage within ±0.25% across full load.

• Smooth autotracking between operational modes to prevent excitation transients.

• User-selectable stability and response characteristics for various generator types.

2. Integrated Limiting & Protection

• Minimum and Maximum Excitation Limiters to prevent under- or over-excitation.

• Stator current and V/Hz limiters protect generator windings and prevent saturation.

• Exciter Diode Monitoring (EDM) detects open or shorted exciter diodes.

3. Monitoring and Diagnostics

• Sequence-of-Events (SOE) recording with timestamps for troubleshooting.

• Oscillography captures voltage and current waveforms during disturbances.

• Local backlit LCD display for configuration, status, and basic diagnostics.

4. Connectivity & Integration

• RS-232 and RS-485 serial ports for remote monitoring and control.

• Modbus™, DeviceNet, and Ethernet communication support for integration with SCADA/DCS systems.

• Configurable via Basler’s BESTCOMS™ software for precise tuning and commissioning.

Quick Specifications

Applications

• Power Plants: Stable excitation control for hydro, thermal, and renewable generators.

• Industrial Power Systems: Ensures voltage stability and protects equipment under varying load conditions.

• Renewable Energy: Wind and solar generator excitation management.

• System Upgrades: Replacement or retrofit for older generator excitation systems.

• Fault Response: Provides rapid protection and limiting during abnormal conditions.

FAQ

Q: Can DECS-200-2L handle both single-phase and three-phase sensing?
A: Yes, it supports True RMS sensing for accurate control in both single-phase and three-phase configurations.

Q: What modes of operation does it support?
A: AVR, FCR, VAR, and PF control modes with autotracking between modes.

Q: What communication protocols are supported?
A: RS-232, RS-485, Modbus™, DeviceNet, and Ethernet for SCADA/DCS integration.

Q: Is it suitable for harsh environmental conditions?
A: Yes, it is IP65 rated and operates reliably from -20°C to +70°C.