DECS-250 Digital Excitation Control System

The DECS-250 is a comprehensive digital excitation control system designed for precise voltage, VAR, and power factor regulation, as well as superior system response and generator protection. It is a compact, flexible, and cost-effective solution that offers extensive functionality, including an optional power system stabilizer to help meet stringent grid code compliance requirements.

Key Features

• Complete Digital Excitation Control: Provides accurate control of generator voltage, VAR, and power factor.
• Generator Protection: Ensures enhanced generator reliability with advanced protection features.
• Flexible and Cost-effective: Designed to deliver extensive functionality in a compact, user-friendly package.
• Optional Power System Stabilizer: Meets stringent grid code compliance requirements.

Specifications

Power Supply

• Nominal Input Voltage:
  • Style LXXXXXX: 16 to 60 Vdc
  • Style CXXXXXX: 90 to 150 Vdc, 82 to 132 Vac
• Burden: 50 VA or 30 W

AC Operating Power and DC Output Power

• 32 Vdc:
  • Nominal Input Voltage: 60 Vac
  • Full Load Continuous Voltage: 32 Vdc
  • Minimum Field Resistance: 2.13 Ω
• 63 Vdc:
  • Nominal Input Voltage: 120 Vac
  • Full Load Continuous Voltage: 63 Vdc
  • Minimum Field Resistance: 4.2 Ω
• 125 Vdc:
  • Nominal Input Voltage: 240 Vac
  • Full Load Continuous Voltage: 125 Vdc
  • Minimum Field Resistance: 8.33 Ω
• All Styles:
  • Power Input Configuration: 1-phase and 3-phase
  • Full Load Continuous Current: 15 Adc
  • 10-Second Forcing: 30 Adc
  • Power Input Frequency: 50 to 500 Hz

Generator Current Sensing

• Configuration: 1-phase or 3-phase with separate input for cross-current compensation
• Current Ranges: 1 Aac or 5 Aac nominal
• Frequency: 50/60 Hz Nominal
• Burden:
  • 1 Aac sensing: < 5 VA
  • 5 Aac sensing: < 10 VA

Generator and Bus Voltage Sensing

• Configuration: 1-phase or 3-phase
• Voltage Ranges:
  • 100/120 Vac ±10%
  • 200/240 Vac ±10%
  • 400/480 Vac ±10%
  • 600 Vac ±10%
• Frequency: 50/60 Hz Nominal
• Burden: < 1 VA per phase

Inputs and Outputs

• Contact Inputs: 16 programmable dry contact inputs
• Auxiliary Input: 4 to 20 mA or ±10 Vdc input
• Output Contacts: 11 programmable form A contacts and one form C for watchdog function
  • Rating: Make, break, and carry 7 A resistive @ 24/48/125 Vdc (120/240 Vac)

Communication

• USB: USB type B
• RS-232: RS-232, 9-pin sub D for optional external autotracking
• RS-485: Modbus™ RTU protocol
• CAN Bus: One port for ECU communications, one port for expansion modules
• Ethernet:
  • 100baseT (standard)
  • 100baseFX (optional)
  • Modbus TCP protocol for unit-to-unit communication
• Expansion Port: Optional Profibus protocol

Environmental

• Operating Temperature: -40°C to 70°C (-40°F to 158°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Salt Fog: MIL-STD 810E method 509.3
• Shock: 15 G in three perpendicular planes
• Vibration: 5 G from 18 to 2,000 Hz in three perpendicular planes

Physical

• Weight: 14.6 lb (6.62 kg)
• Dimensions:
  • Width: 6.26 inches (159.0 mm)
  • Height: 12.00 inches (304.8 mm)
  • Depth: 8.62 inches (219.0 mm)