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Digital Excitation Control System
16–60 VDC microprocessor-based system
Regulating the generator via a PWM module
Supplying 15 Adc continuously and 30 Adc forcing for 10 seconds
The DECS-250 DECS-250-LN1SN1N is a high-performance Digital Excitation Control System (AVR). Featuring a single-system configuration with vibration-resistant spring terminals, it supports 24/48 VDC logic power and Modbus TCP Ethernet communication. It delivers a 15A continuous (30A forcing) excitation output and integrates four control modes (AVR/FCR/var/PF) along with built-in limiters and oscillography, widely used for precise grid-paralleling and protection of medium-to-large synchronous generators.
Auto tuning feature with two PID stability groups
True RMS sensing, single-phase or three-phase voltage and current
Precise excitation control for synchronous generator or synchronous motor applications
The DECS-250N digital excitation control system offers high performance, high flexibility, and extreme reliability for brushless excited AC synchronous generators. The DECS-250N utilizes a 20-amp six-thyristor negative forcing output, providing exceptional system transient response. Multiple communication options and an optional integrated power system stabilizer make the DECS-250N a complete system solution in a reliable and cost effective package.
The DECS-250 is intended for synchronous generator applications where the DECS-250 controls the generator output through the application of regulated excitation power to the field. It provides regulated dc excitation power based on the monitored generator voltage and current and a regulation setpoint established by the user. Excitation power is supplied from the DECS-250 by means of a filtered, switching power module that uses pulse-width modulation. It is capable of supplying 15 Adc continuously at a nominal voltage of 32, 63, or 125 Vdc. With nominal operating power applied, it has a forcing capability of 30 Adc for 10 seconds. Device specific configurations, options, and operational characteristics are defined by a combination of letters and numbers that make up the style number printed on the device identification label.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
BASLER ELECTRIC DECS-250 DECS-250-LN1SN1N Digital Excitation Control System Manuals, Datasheets, Drivers, 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.
Oil & Gas
Controls synchronous generators within captive power plants on offshore drilling platforms, LNG terminals, and oil refineries to guarantee continuous production.
Pulp & Paper Industry
Provides excitation control for steam turbine generators paired with black liquor high-pressure boilers, ensuring voltage quality during the operation of highly inductive loads like paper machines.
Steel & Ferrous Metallurgy
Stabilizes high-frequency voltage flicker caused by large Electric Arc Furnaces (EAF) and controls high-power synchronous motors in blast furnace blowers.
Conventional Thermal & Biomass Power Generation
Serves as the excitation regulator for main steam turbine generators in small-to-medium coal, gas, and biomass power plants, executing high-precision grid-tied reactive power dispatching.
Small & Medium Hydroelectric Power
Regulates run-of-river or reservoir-type hydro-generators, maintaining constant terminal voltage under conditions of wide hydraulic head variations and frequent load swings.
Large-Scale Non-Ferrous Metal Smelting
Regulates generator units upstream of massive rectifying transformers in energy-intensive aluminum and copper smelting plants' captive power workshops, suppressing low-frequency harmonic interference.
When operating the DECS-250-LN1SN1N, the auxiliary control power must be strictly connected to a 16–60 VDC low-voltage DC source and never to high-voltage AC lines. The unit must be mounted vertically to ensure optimal air convection across the rear aluminum heatsink fins, while generator potential and current transformer signals must be securely wired to prevent limiter malfunctions. Before altering parameters, back up the original configuration via the BESTCOMSPlus software, wear proper ESD grounding protection before handling the casing, and ensure a dedicated single-point system electrical ground to eliminate high-frequency conducted electromagnetic interference generated by pulse-width modulation (PWM) switching.
DECS-250 DECS-250-LN1SN1N is a fully digital excitation control system for high-precision regulation, comprehensive protection, and intelligent grid paralleling of synchronous generators and synchronous motors. The system integrates modern microprocessor technology, a powerful pulse-width modulated power output stage, and deep programmable logic, serving as the core control hub to ensure the stable operation of large and medium-sized power generation and industrial drive systems.
What types of generators are compatible with the DECS-250?
It is designed for use with synchronous generators in industrial, standby, and continuous-duty power generation applications.
What power supply options does the DECS-250 support?
The system supports a wide range of AC or DC control power inputs depending on the configuration, allowing flexible installation.
Does the DECS-250 include built-in protection features?
Yes, it includes protection functions such as overvoltage, undervoltage, loss of sensing, and field-related fault monitoring.
What is DECS-250 DECS-250-LN1SN1N?
DECS-250 DECS-250-LN1SN1N is a digital excitation control system.
Which physical network interfaces are available on the DECS-250 DECS-250-LN1SN1N to read real-time data on industrial sites?
The unit housing integrates a standard USB port, an RS-485 serial bus connection, and an RJ45 Ethernet network interface supporting industrial communication protocols.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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