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Description
Overview
Essential details：DECS-250-LN1SN1N DECS-250 digital excitation control system
Basler Electric’s DECS-250 digital excitation control system offers high performance, high flexibility, and extreme reliability for brushless excited AC synchronous generators. The DECS-250 offers a 15 amp pulse width modulated power stage providing high field forcing. Multiple communication options and an optional integrated power system stabilizer make the DECS-250 a complete system solution in a reliable and cost effective package.
By utilizing the very intuitive BESTCOMSPlus® PC software, the setup, configuration, operation and control can be performed quickly and accurately.
The BESTCOMSPlus PC software utilizes the powerful and flexible BESTLogicPlus programmable logic program. This integrates PLC capabilities allowing users to customize their control scheme to meet virtually any application.
• True RMS sensing, Single or Three Phase voltage and current
• Full Generator Metering Capabilities
• AVR / FCR / FVR, Power Factor and var modes of operation
• Integrated Generator Protection ( 27/59, 81O/U, 32R, 40Q), EDM, 59F, 51F, Loss of PMG, Field Short Circuit, and 25 Sync Check
• Configurable Protection
• Overexcitation Limiting (with temperature compensation)
• Underexcitation Limiting
• Stator Current Limiting (with temperature compensation)
• Var Limiting
• Underfrequency Limiting or V/Hz Limiting
The DECS-250 is a microprocessor based excitation control system. The DECS-250 is designed to control and protect the generator and excitation system. Additionally, it provides extensive metering capabilities, communication capabilities, as well as fully programmable I/O. The DECS-250 provides excitation to the generator via a pulse width modulated power stage capable of 32Vdc, 63Vdc, or 125Vdc nominal voltages with a continuous output rating of 15Adc.
DECS 200-2C
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DECS-250-LN1SN1N DECS-250 digital excitation control system
• Front panel mounting bracket for DECS-250, plate only part number 9440300039, kit (plate and installation hardware) part number 9440311100.
• Interconnection cable (5′) for redundant systems, part number 9310300032.
• Control power isolation transformer; part number BE31449001. Provides required isolation on AC control power when dual control power sources are used.
• Freewheeling diode module, part number 9293600101, required in redundant systems with live transfer.
• Inrush current reduction module, part number 9387900104, required when the operating power is supplied via a station service source.
• Interactive display panel for remote control, metering and annunciation: IDP-800.
• Contact Expansion Module: CEM-2020 and CEM-2020H.
• Analog Expansion Module: AEM-2020.
Contact Expansion Module for paralleled genset applications, CEM-2020 and CEM-2020H Basler Electric offers two add-on modules to increase the already abundant contact input and output capability of the DECS-250. These modules communicate to the DECS-250 via SAE J1939 CANbus and allow the user to program the functionality of these inputs and outputs in Basler’s very powerful logic program. The user can add labels for the inputs and outputs that appear in BESTCOMSPlus, on the front panel, and in programmable logic.
All of the functionality can be assigned to these inputs and outputs as if they were an integrated part of the DECS-250. Two modules of the CEM are available, CEM-2020 and CEM-2020H. Both modules add an additional ten contact inputs to the DECS-250.
The 1A rated contacts are gold contacts for low current circuits. These modules provide the user with the flexibility to use the DECS-250 for more complicated applications that require contact functionality or duplication of contacts for remote annunciation. Pure flexibility is one of the benefits of the DECS-250, and this add-on module enhances that benefit even further. Drop it in, connect it, and you have added 10 more contact inputs and 24 or 18 more contact outputs.
Basler’s optional AEM-2020 module provides eight remote analog inputs, eight remote RTD inputs, two remote thermocouple inputs, and four remote analog outputs to the DECS-250. The AEM-2020 communicates with the DECS-250 through a CANbus interface.
The eight analog inputs are user-selectable for 4 to 20 mA or 0 to 10 Vdc. Each analog input has under/over thresholds that can be configured as status only, alarm, or pre-alarm. Each of these inputs can be selected and used in our powerful programmable logic software. For temperature measurement, the AEM provides for eight RTD inputs that can be configured for 10 or 100 Ohm RTDs. It also has two inputs for K-type thermocouples.
Each of these ten temperature measurement inputs can be configured with high or low temperature thresholds.
Each of these inputs can be selected and used in our powerful programmable logic software. Also, these allow for RTD’s to be plotted for OEL and SCL functions.
The analog outputs are user-selectable for 4 to 20 mA or 0 to 10 Vdc. These outputs are intended to drive external analog meters and can be configured for indication of generator voltage, bus voltage, generator frequency, generator kW as well as numerous addition parameters.
