BASLER ELECTRIC DECS-200

Product Name: Basler Electric DECS-200 Digital Excitation Control System (Compact / Panel-mount Digital AVR)
Models Covered:
- DECS-200-2C — 200-series, 2 A field, with serial comms (C = Comm option)
- DECS-200-2L — 200-series, 2 A field, basic I/O (L = Limited I/O)
- DECS-200N-C1 — 200N variant (enhanced), with Comm option C1 (RS-485 / Ethernet)

Category: Others

Description

Product Introduction: A microprocessor-based automatic voltage regulator (AVR) and excitation control for synchronous AC generators. Replaces analog thyristor/potentiometer AVRs with digital PID control, true RMS sensing, integrated generator protection, and communications. Suitable for shunt, PMG, or auxiliary-winding excited generators.
Technical Specifications (DECS-200 Family):
- Excitation Output: 2 A continuous / 4 A peak (model -2x); optionally 4 A / 15 A versions in DECS-250 family
- Sensing: 3-phase or single-phase True RMS voltage & current sensing
- Control Modes: AVR (Auto Voltage Regulator), Manual Field Current Reg., PF Control, Var Control
- PID Tuning: Auto-adaptive PID with BESTCOMSPlus® software; manual fine-tune via front panel or PC
- Communications: RS-485 (Modbus RTU) std.; optional Ethernet (some suffixes); network load sharing for paralleling
- Inputs: Programmable digital inputs (start/stop, raise/lower, auto/manual); analog setpoint input (4–20 mA)
- Outputs: Programmable relay outputs (alarm, trip); analog metering outputs
- Protections: Over/under voltage (27/59), Over/under freq (81O/U), loss of field, field short, overexcitation limit, V/Hz limit, sync check (25)
- Display: Alphanumeric LCD + keypad (on panel-mount versions)
- Supply: 120/240 V AC or 125 V DC (depending on ordered option), PMG or station service
- Operating Temp.: –20 °C to +60 °C
- Certifications: UL, cUL, CE
Functional Features: Offline simulator in software; oscillography & event recording (SOE); optional Power System Stabilizer (PSS) for grid code compliance; auto-follower for paralleled units; conformal coating on PCB for harsh environments.
Applications: Synchronous generator voltage regulation in power plants, cogeneration, marine gensets, industrial standby generators (up to several MVA).
Installation & Notes: Verify generator CT/PT ratios entered in setup before closing field breaker. Use shielded twisted pair for PT inputs, grounded at one end. Do not apply AC sensing voltage > rated PT secondary (typically 120 V). Commission PID gains under no-load then step-load conditions. Firmware updates via BESTCOMSPlus only with stable 24 V supply.

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