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BASLER ELECTRIC DECS-200
BASLER ELECTRIC DECS-200
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Metso D202593
Metso D202593

BASLER ELECTRIC DECS-250-CN1CN1N

  • Product Name:​ Basler Electric DECS-250 Compact Digital Excitation Control System — 15 A PWM Power Stage
  • Product Introduction:​ Full-function digital AVR/excitation controller with built-in 15 A PWM firing circuit for direct connection to generator field. Includes all DECS-200 capabilities plus higher excitation current capacity, enhanced I/O, and expanded communications. The suffix “-CN1CN1N” denotes: C = Communications (Ethernet+RS485), N = Low voltage DC control supply (LN2 type), 1 = Standard I/O set, N = No PSS or specific regional config (verify with Basler ordering guide).
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Description
  • Technical Specifications:
    • Field Output:​ 15 A continuous PWM (up to 90 V DC typical on shunt / PMG excitation)
    • Control Supply (LN2 version):​ 24–48 V DC (low voltage DC powered)
    • Sensing:​ 3-phase True RMS PT input (up to 600 V LL cat. III); CT input for VAR/PF control
    • PID Control:​ Digital with auto-tuning; optional PSS (Power System Stabilizer) on some suffix variants
    • Communications:​ Ethernet 10/100Base-T (Modbus TCP), RS-485 (Modbus RTU); Network Load Sharing for multi-unit paralleling
    • Digital I/O:​ 8–16 programmable DI (dry contact), 4–6 programmable relay DO (form C, 5 A)
    • Analog I/O:​ 4–20 mA setpoint input; analog metering outputs (V, A, Hz, PF)
    • Integrated Protections:​ 27/59, 81O/U, 32R, 40Q, 47, 51F, 59F, field loss, diode fail monitor (EDM), overexcitation limit, V/Hz limit, sync check 25
    • Software:​ BESTCOMSPlus® for configuration, trending, offline simulation (BESTlogic™Plus)
    • Display:​ Backlit LCD + membrane keypad
    • Mounting:​ Panel mount (NEMA / IP54 front face) or DIN rail (variant-dependent)
    • Operating Temp.:​ –20 °C to +60 °C
    • Humidity:​ 5–95% non-condensing
    • Certifications:​ UL, cUL, CE, sometimes IEC 60255
  • Functional Features:​ Fast transient response via 15 A PWM stage; true RMS sensing immune to harmonic distortion; full generator protection suite; paralleling with automatic load share; waveform capture for commissioning; multi-language UI.
  • Applications:​ Medium to large synchronous generators (gas/steam turbine-driven, diesel prime/standby 1–50 MVA), cogeneration plants, IPP plants, marine main switchboard excitation.
  • Installation & Notes:​ Follow Basler wiring diagram — field (+) / (–) polarity matters for PMG vs. shunt. Ensure PT fuses sized correctly. Perform “Excitation System Test” in software before synchronizing to grid. Record all PT/CT ratio settings during commissioning. Use surge suppression on field leads if cable length > 30 m.
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