BASLER DECS-300 DIGITAL EXCITATION CONTOL SYSTEM DECS-300-L0N0

Product Description

The BASLER DECS-300 Digital Excitation Control System is a microprocessor-based device for generator power management. It provides control signals for phase control of SCR bridges manufactured by Basler Electric, offering precise control for generators of any size and being equally suitable for exciter field or main field applications. It is a total excitation control system housed in a 19-inch rack mount enclosure, integrating all functions necessary to limit, control and protect the generator from operating outside its capability.(Same Series Models:DECS-400)

DATA SHEET

BASLER DECS-300.pdf

Specific Parameters

• Power Input:
• DECS-300-L: 24/48Vdc nominal (16-60Vdc), Burden=30W
• DECS-300-C: 120Vac nominal (85 to 132Vac, 50 or 60Hz), Burden=50VA; 125Vdc nominal (90 to 150Vdc), Burden=30W
• Generator Voltage Sensing: Single-phase or three-phase line voltage, two ranges: 100V/50Hz nominal (85 to 127V), 120V/60Hz nominal (94 to 153V); 200V/50Hz nominal (170 to 254V), 240V/60Hz nominal (187 to 305V)
• Bus Voltage Sensing: Single-phase line voltage (AC), two ranges: 100V/50Hz nominal (85 to 127V), 120V/60Hz nominal (94 to 153V); 200V/50Hz nominal (170 to 254V), 240V/60Hz nominal (187 to 305V)
• Generator Current Sensing: Two AC current sensing ranges and two channel (phase) inputs, 1A (phase B; phases A or C), 5A (phase B; phases A or C)
• Sensing Burden: Voltage: Less than 1VA per phase; Current: Less than 1VA
• Control Outputs: ±10Vdc, 0 to +10Vdc, 4 to 20 milliamperes dc
• Contact Outputs: Meet ANSI C37.90, 30 amperes for 0.2 seconds; 7 amperes continuous; 0.3 amperes at 125 or 250Vdc (L/R=0.04 maximum), 8 output contacts with 300-volt surge suppressors
• Isolation Module: Operating voltage + and - 12Vdc from DECS-300, five field voltage sensing ranges (32, 63, 125, 250, 375 volts), field analog output signal 0.9 to 9.1Vdc (5.0Vdc=0 field voltage); two field current sensing ranges (50, 100 millivolts), field analog output signal 2.0 to 9.5Vdc (2.0Vdc=0 field current)
• Communication: Three communication ports, two RS-232 and one RS-485. COM0 (front panel): 1200 to 19200 baud, 8N1 full duplex, ASCII commands; COM1 (rear panel): 1200 to 19200 baud, 8N1 full duplex, unique ASCII commands (only for autotracking); COM2 (rear panel): 1200 to 19200 baud, 8N1 half duplex, Modbus protocol
• Regulation Accuracy:
• AVR Mode: ±0.25% over the load range, steady state stability ±0.1%, temperature drift ±0.5% for 0 to 50°C change; Underfrequency (volts/hertz) characteristic slope from 0 to 3.0 P.U. adjustable in 0.1 P.U. increments; Voltage regulation error within ±2.0% of the nominal voltage
• FCR Mode: ±1.0% of the nominal value for 10% of the bridge input voltage change or 20% of the field resistance change, otherwise ±5.0%
• VAR Mode: ±2.0% of the nominal VA rating at the rated frequency
• PF Mode: ±0.02 PF in the set point PF for the real power between 10 and 100% at the rated frequency
• Autotracking: ±0.5% of the setting change when transferring
• Parallel Compensation: Can use either reactive droop or reactive differential (cross-current) compensation, droop adjustable from 0% to +30% in 0.1% increments, burden less than 1VA
• Line Drop Compensation: Active when the droop setting is set as a negative value, adjustable from -30% to 0% in 0.1% increments
• Environment: Operating temperature: -40°C to +60°C; Storage temperature: -40°C to +85°C; Shock: 15 Gs in each of three mutually perpendicular planes; Vibration: 2Gs at 10 to 500Hz
• Size and Weight: 19 inch rack mount, 3 rack units high; Net weight 13.5 lb. (6.12kg), shipping weight 17 lb. (7.71kg)

Product Performance

• Microprocessor-based design with true RMS voltage sensing (single or three phase), voltage regulation accuracy up to 0.25%
• 40 standard stability selections, supporting user-customizable stability selections (two PID setting groups), enabling bumpless transfer between modes
• Features including paralleling compensation, line drop compensation, underfrequency compensation or V/Hz Ratio Limiter, voltage soft-start buildup, etc.
• Equipped with Field Current Regulation Mode (Manual Mode), supporting autotracking between modes and between DECS-300 units, and autotransfer to a backup DECS-300 unit
• Supports various remote set point control methods, including contact inputs, proportional control via ±10Vdc or 4-20mA, communications inputs via RS-232 (ASCII) or RS-485 (Modbus)
• Built-in Minimum Excitation Limiter, on and off-line Maximum Excitation Limiters, Stator Current Limiter, VAR and Power Factor Controller
• Has Sequence of Events Recording and Oscillography functions, 7 generator protection features, and programmable output contacts
• Front panel with backlit LCD display, front panel RS-232 and rear-mounted RS-485 communication ports, Modbus protocol supporting communication up to 4000 feet away
• <1% metering accuracy for 13 generator parameters, meets C37.90.1-1989 for Surge Withstand and Fast Transient, UL recognized, CSA certified, CE compliant, Gost R certified

Application Fields

Industries such as power, industry, energy, manufacturing, etc., for excitation control of synchronous generators.

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