Basler Electric DECS-250-LN2SN1N
Basler Electric DECS-250-LN2SN1N
Basler Electric DECS-250-LN2SN1N
Basler Electric DECS-250-LN2SN1N
Basler Electric DECS-250-LN2SN1N
Basler Electric DECS-250-LN2SN1N
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DECS-250-LN2SN1N

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The DECS-250-LN2SN1N is a complete digital excitation control system. Total control in a compact package provides precise voltage, var and Power Factor regulation, and exceptional system response, plus generator protection.
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Technical specifications for DECS-250-LN2SN1N

  • Manufacturer:
    Basler Electric
  • Part Number:
    DECS-250-LN2SN1N
  • Product Family:
    Basler Electric
  • Product Type:
    Digital Excitation Control System
  • Stock:
    1
  • Power Supply Configuration:
    L-type
  • DC Input Voltage Range:
    16 to 60 Vdc
  • PWM Power Stage:
    15 Amp
  • Continuous Current (below 55°C):
    20 Adc at full load
  • Continuous Current (below 70°C):
    15 Adc
  • Field Forcing Current:
    30 Adc for 10 seconds
  • Power Input Configuration:
    Single-phase or three-phase
  • Input Frequency Range:
    50 to 500 Hz
  • Weight:
    6.62 kg
  • Estimated shipping dimensions:
    1.59×3.04×2.19cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Installation Diagnostics Application Scenarios

Features:

  • Interface Between the Generator Field Winding and Digital Control System
  • Combines Capability of Precise Voltage/VAR/PF Regulation with Comprehensive Generator Protection
  • Operates in Conjunction with Synchronous Generators and Synchronous Motors
The DECS-250-LN2SN1N operates as the Digital Excitation Control System in a generator control cabinet, providing reliable field current to the generator rotor. It continuously converts incoming DC power (16-60 Vdc) to regulated PWM output and distributes this excitation current through the field circuit to support stable voltage regulation of the generator under all load conditions. Seamless redundancy is available with the DECS-250-LN2SN1N, however using an optional Dual Redundant Configuration will allow seamless switchover to a backup controller in the event of a primary control failure. The DECS-250-LN2SN1N has made improvements in several areas over previous analog excitation designs in addition to incorporating universal input voltage capability within the excitation system.

The DECS-250-LN2SN1N provides essential excitation functions common to the entire generator, and is a critical component of the voltage regulation path, directly affecting the proper, normal operation of the overall generator system. One or two DECS-250-LN2SN1N controllers are required per generator depending on the desired redundancy level. The DECS-250-LN2SN1N occupies a compact standalone enclosure in the control cabinet and is always located in the dedicated excitation control position.

For Dual Redundant Control applications, the Generator System requires a second DECS-250-LN2SN1N controller installed in the redundant position. In addition to standard single controller operation, the redundant configuration also performs automatic switchover. The DECS-250-LN2SN1N dual controller configuration executes failover using the internal CAN Bus communication specified in the controller options. Using this method, the redundant control system continually monitors the health of both controllers. If the system detects that the primary DECS-250-LN2SN1N is no longer providing stable output (outside configured voltage/tolerance levels), it will automatically transfer the load to the secondary controller and log an event in the System Event Recorder.

The DECS-250-LN2SN1N Basler Electric Digital Excitation Control System may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Basler Electric DECS-250-LN2SN1N Digital Excitation Control System Manuals, Datasheets, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Basler Electric DECS-250-LN2SN1N Digital Excitation Control System Specs

General

  • Manufacturer Basler Electric
  • Model DECS-250-LN2SN1N
  • Condition New Original ready stock
  • Product Family DECS-250,DECS–250N,DECS-150
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Power Disconnection: Before performing any wiring operations, all input power and excitation output circuits must be disconnected.
  • Physical Fixing: Install the controller in a low-vibration, well-ventilated control cabinet that meets IP20 protection standards.
  • Signal Grounding: Ensure the chassis grounding terminal is connected to the main system grounding grid via a low-impedance copper busbar to reduce electromagnetic interference.
  • Power Wiring: Connect the single-phase or three-phase AC control power supply according to the drawings and install matching fast-acting fuses for protection.
  • Transformer Configuration: Correctly connect the secondary sides of the current transformer (CT) and voltage transformer (PT), ensuring the polarity is not reversed.
  • LED Status Indicators: Use the "READY" and "ALARM" indicator lights on the front panel to initially determine the system's operating status.
  • Fault Log: Use BESTCOMS Plus software to retrieve the internal event logger and view the timestamped alarm history.
  • Waveform Capture: Triggers the built-in oscillator function to analyze voltage and current waveforms under sudden load increases or transient fault conditions.
  • Communication Test: Checks the flashing status of the Modbus or Ethernet interface to confirm data synchronization between the controller and the host HMI.
  • Hardware Self-Test: Runs a comprehensive self-test program to check the health of the internal microprocessor, memory, and analog input channels.
  • Hydropower: Suitable for medium and large-sized hydro turbine generator sets, handling load fluctuations caused by head changes and providing rapid excitation response.
  • Thermal Power: Used in combined heat and power (CHP) or industrial self-owned thermal power units to ensure grid voltage stability during sudden large-capacity loads.
  • Marine Power: Diesel generator sets deployed on large ships or offshore drilling platforms to meet the requirements of high vibration and complex marine environments.
  • Synchronous Condenser: Applied to synchronous condenser systems in new energy reactive power compensation stations, providing transient voltage support and reactive power regulation.
Description
DECS-250-LN2SN1N is a high-performance digital excitation control system designed for synchronous generator and synchronous motor applications. DECS-250-LN2SN1N features an L-type power supply configuration with a wide DC input range of 16 to 60 Vdc, accommodating various power supply environments.

DECS-250-LN2SN1N delivers precise voltage, VAR, and power factor regulation, ensuring stable generator output and providing excellent system response to load transients. DECS-250-LN2SN1N incorporates a 15 Amp PWM power stage, delivering 20 Adc continuous current at full load below 55°C ambient temperature, 15 Adc continuous current below 70°C, and 30 Adc for 10 seconds of field forcing. DECS-250-LN2SN1N supports both single-phase and three-phase power input configurations with a frequency range of 50 to 500 Hz.

DECS-250-LN2SN1N supports True RMS sensing and can be configured for single-phase or three-phase voltage and current sensing. DECS-250-LN2SN1N offers voltage sensing ranges including 100/120 Vac, 200/240 Vac, 400/480 Vac, and 600 Vac. DECS-250-LN2SN1N provides 16 programmable dry contact inputs, 11 programmable Form A output contacts, and 1 Form C watchdog output contact. DECS-250-LN2SN1N auxiliary inputs support 4 to 20 mA or ±10 Vdc signals.

DECS-250-LN2SN1N integrates comprehensive generator protection functions including overexcitation limit with temperature compensation, underexcitation limit, stator current limit with temperature compensation, VAR limit, underfrequency or V/Hz limit, excitation diode monitoring (EDM), loss of field protection, and field short circuit protection. DECS-250-LN2SN1N also features trending, oscillography, and sequence of events recording capabilities for fault diagnosis and system analysis.

DECS-250-LN2SN1N supports multiple communication interfaces including USB Type B, RS-232, RS-485 with Modbus RTU protocol, CAN Bus for ECU communication and expansion modules, and 100baseT Ethernet with Modbus TCP protocol, with optional Profibus protocol expansion available. DECS-250-LN2SN1N can be configured using Basler BESTCOMSPlus® software with intuitive drag-and-drop programmable logic, real-time bar graph functionality, and automatic PID tuning to simplify system configuration and significantly reduce commissioning time.

DECS-250-LN2SN1N operates within a temperature range of -40°C to 70°C and stores within -40°C to 85°C. DECS-250-LN2SN1N meets MIL-STD 810E salt fog testing standards, with 15G shock resistance and 5G vibration resistance from 18 to 2000 Hz. DECS-250-LN2SN1N is CSA certified, UL 6200:2019 recognized, CE and UKCA compliant, and holds Bureau Veritas (BV), DNV, and American Bureau of Shipping (ABS) approvals.
Alternative Names
DECS-25O-LN2SN1N DECS-250-LN2SNIN DECS250LN2SN1N DECS-250 DECS-250N DECS-250E DECS-150 AEM-2020
Technical notes
The Basler DECS-250-LN2SN1N elevates generator management with its high-speed event recording that captures up to 60-cycle oscillography data for precise fault analysis. Compliant with strict grid codes, it features built-in Power System Stabilizers (PSS) to dampen low-frequency oscillations in complex generator networks.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is DECS-250-LN2SN1N?
DECS-250-LN2SN1N is a high-performance digital excitation control system designed for synchronous generator and synchronous motor applications.
What input configurations does DECS-250-LN2SN1N support?
DECS-250-LN2SN1N supports both single-phase and three-phase power input configurations with a frequency range of 50 to 500 Hz.
What protection functions does DECS-250-LN2SN1N include?
DECS-250-LN2SN1N integrates overexcitation limit with temperature compensation, underexcitation limit, stator current limit with temperature compensation, VAR limit, underfrequency or V/Hz limit, excitation diode monitoring (EDM), loss of field protection, and field short circuit protection.
How is DECS-250-LN2SN1N configured?
DECS-250-LN2SN1N can be configured using Basler BESTCOMSPlus® software with intuitive drag-and-drop programmable logic, real-time bar graph functionality, and automatic PID tuning.