Basler DECS‑250 CN1SN1N Digital Excitation Control System (AVR)

Product Description

The Basler DECS‑250 CN1SN1N is a full‑featured digital excitation controller (automatic voltage regulator) for synchronous generators and synchronous motors. It delivers high‑precision voltage regulation, VAR / power factor control, paralleling droop control and integrated generator protection. CN1SN1N is the factory configuration code that defines mounting, I/O, communication and power supply options for this unit. It is widely used in hydro, diesel, gas turbine and marine generator excitation cabinets, configured and tuned via BESTCOMSPlus® software with BESTlogicPlus programmable logic.

Features

• Part Number: DECS‑250 CN1SN1N, Brand: Basler Electric
• Series: DECS‑250 digital excitation controller
• Control modes: Voltage regulation, VAR control, PF control, droop / isochronous for parallel operation
• Built‑in PSS (Power System Stabilizer) for grid oscillation damping
• Excitation output: 20A continuous field current, positive field forcing
• Protection functions: Loss of PT sensing, overexcitation, underexcitation, overvoltage, undervoltage, over/under frequency, thermal monitoring
• Communication: Modbus RTU, Modbus TCP, supporting DCS and SCADA connection
• Local HMI: LCD display, keypad, status LED indicators, event and fault recorder
• Programming tool: BESTCOMSPlus, auto‑PID tuning, offline simulation, custom logic programming
• Certifications: CE, IEC, grid‑code compliant for utility and industrial generation
• Manufacturer Status: Active production, original new, surplus and calibrated refurbished available
• Typical gross weight: approx 2.9 kg, origin: United States
• Mounting: Panel mount version (CN configuration code)

Applications

• Hydroelectric generator, diesel genset, gas turbine synchronous generator excitation control
• Marine generator, offshore platform auxiliary power AVR
• Industrial self‑generation plant, mine, CHP unit voltage and reactive power control
• Synchronous condenser and large synchronous motor excitation regulation
• Legacy excitation system retrofit, spare replacement and cabinet upgrade

FAQ

Q: What is the difference between DECS‑250 CN1SN1N and LN2SN1N?
A: The prefix CN / LN defines mounting style and terminal layout; CN is panel mount, LN is rack/chassis mount, internal control functions are the same.

Q: What is the difference between DECS‑250 and DECS‑250N?
A: DECS‑250N adds negative field forcing capability for faster transient response, suitable for strong grid and high‑speed disturbance applications.

Q: Can it replace ABB UNITROL series AVR?
A: It can be used as functional replacement, but PT/CT wiring, auxiliary power, excitation power stage and control logic require re‑configuration and commissioning.