Honeywell| DECS-200-2L | Digital Excitation Control System

Description

The DECS-200-2L is a microprocessor-based digital excitation control system designed to precisely regulate the output voltage, vars, or power factor of synchronous generators. It supports various DC excitation applications up to 15 Adc, with outputs of 32Vdc, 63Vdc, and 125Vdc. The system incorporates a pulse width modulated (PWM) power stage, enhancing performance in non-linear load conditions. Suitable for generators of any size, it provides advanced control and protection features.

Features

• Microprocessor-Based Design: Ensures precise control and flexibility.
• True RMS Sensing: Supports single or three-phase sensing.
• High Accuracy: 0.25% voltage regulation accuracy.
• Stability Settings: 20 preprogrammed PID settings; user-customizable.
• Protection Functions: Eight generator protection features.
• Communication Ports: Front panel RS-232, side RS-485 (Modbus™ protocol).
• Remote Set Point Control: Via contact inputs, ±10Vdc, 4-20mA, RS-232, or RS-485.
• Underfrequency/V/Hz Ratio Limiter: Adjustable slope and corner frequency.
• Soft Start Buildup: User-adjustable voltage buildup rate.
• Paralleling Compensation: Supports reactive droop or differential compensation.
• Sequence of Events Recording (SER): Logs up to 127 events with timestamps.
• Oscillography: Records up to 8 oscillographic records.
• Environmental Compliance: UL, CSA, CE, DNV, GOST-R certified.
• Operating Temperature: -40°C to +60°C (-40°F to +140°F).

Technical Specifications

• DC Output:
  • 32Vdc, 63Vdc, 125Vdc at 15 Adc.
  • Rated 10-second forcing voltage: 50Vdc, 75Vdc, 100Vdc, 150Vdc, 200Vdc, 300Vdc.
  • Minimum field resistance: 2.13Ω, 3.0Ω, 4.2Ω, 6.0Ω, 8.3Ω, 12.0Ω.
• Control Power Input:
  • 16-60Vdc, 85-132Vac (50/60Hz), 90-150Vdc.
• AC Operating Power:
  • 60Vac, 120Vac, 240Vac.
  • Burden: 780VA, 1570VA, 3070VA.
• Generator Voltage Sensing:
  • Single-phase or three-phase line voltage, four ranges:
    • 100V/50Hz (85-127V), 120V/60Hz (94-153V).
    • 200V/50Hz (170-254V), 240V/60Hz (187-305V).
    • 400V/50Hz (340-508V), 480V/60Hz (374-600V).
    • 500V/50Hz (425-625V), 600V/60Hz (510-660V).
• Bus Voltage Sensing:
  • Single-phase line voltage (AC), four ranges (same as generator voltage sensing).
• Current Sensing:
  • Two AC current sensing ranges: 1A and 5A.
  • Sensing burden voltage: <1VA per phase.
  • Current: <1VA.
• Contact Inputs:
  • 11 contact switching inputs: Start, Var/PF Enable, Stop, Pre-position, Secondary DECS Enabled (optional), Raise Switch, Unit/Parallel Operation, Lower Switch, AVR Mode, Alarm Rest, FCR Mode.
• Set Point Control:
  • Two separate analog inputs: ±10Vdc, 4-20mA.
• Communication Ports:
  • COM0: RS-232, 9-pin sub-D connector on front panel.
  • COM1: RS-232, 9-pin sub-D connector on right side panel (for autotracking).
  • COM2: RS-485, left side panel (Modbus™ protocol).
• Regulation Accuracy:
  • AVR Mode: ±0.25% over load range.
  • FCR Mode: ±1.0% of nominal value.
  • Var Mode: ±2.0% of nominal VA rating.
  • PF Mode: ±0.02 PF.
• Temperature Drift: ±0.5% for 0 to 50°C change.
• Underfrequency Slope: Adjustable from 0 to 3.0 P.U., in 0.1 P.U. increments.
• Dimensions:
  • Width: 8.08" (205mm).
  • Depth: 6.76" (171mm).
  • Height: 12.0" (304mm).
• Weight: 14 lbs (6.35 kg).