Basler Electric DECS-250-LN2SN1N Digital Excitation Control System

Description

The Basler Electric DECS-250-LN2SN1N is a digital excitation control system designed for precise voltage, var, and power factor regulation of synchronous generators and motors. The DECS-250-LN2SN1N configuration integrates a 24/48 Vac/Vdc power supply, internal and external autotracking capabilities, spring type terminals, and a 100Base-T Ethernet communication interface.

Equipped with a pulse-width-modulated (PWM) power stage delivering up to 15 Adc full-load continuous current, the system supports 1-phase or 3-phase true RMS sensing for voltage and current, integrated generator protection, auto-tuning stability controls, and diagnostic logging. Built-in communication interfaces include USB, RS-232, RS-485, CAN bus, and 100Base-T Ethernet for unit-to-unit communication and system setup via BESTCOMSPlus software.

Features

• Complete excitation control supporting Automatic Voltage Regulation (AVR), Field Current Regulation (FCR), Field Voltage Regulation (FVR), Power Factor (PF), and var operating modes
• True RMS single-phase or three-phase generator and bus voltage sensing
• Full generator metering and integrated generator protection functions (27/59, 81O/U, 32R, 40Q, EDM, 59F, 51F, Loss of PMG, Field Short Circuit, and 25 Sync Check)
• Pulse-width-modulated (PWM) power stage adaptable to shunt, auxiliary winding, permanent magnet, or DC-fed systems
• Auto-tuning feature with two PID stability groups
• Overexcitation, underexcitation, stator current, var, and underfrequency / V/Hz limiters
• Internal and external autotracking capabilities
• Load sharing over Ethernet and Modbus TCP protocol
• Conformal-coated internal circuitry for enhanced environmental protection
• Integrated trending, oscillography, and sequence of events recording
• Compatible with AEM-2020 Analog Expansion Module and CEM-2020 Contact Expansion Module

Applications

• Synchronous generator excitation control
• Synchronous motor excitation control
• Industrial power generation plants
• Utility grid-connected power generation facilities

Ordering Information

Technical Specifications

Installation Guidelines

• Mounting: Ensure proper panel mounting with adequate clearance around the enclosure to facilitate airflow and heat dissipation.
• Terminal Wiring: Wire dry contact inputs, output contacts, sensing inputs, and power leads to the spring-type terminal connectors in accordance with system schematics.
• Shielding & Grounding: Use shielded twisted-pair cabling for analog inputs, auxiliary signals, and communication lines to mitigate EMI/RFI noise.
• Communication Connections: Connect Ethernet cables to the 100Base-T port for network communication or unit-to-unit load sharing.

Compliance and Certifications

• CSA certified
• UL recognized
• CE EMC and LVD compliant
• EAC certified
• Bureau Veritas (BV) recognized
• Det Norske Veritas-Germanischer Lloyd (DNV GL) recognized
• American Bureau of Shipping (ABS) recognized