GE DS3800DFXA1B1C DFXA Local Setpoint Adjustment Board Mark IV Speedtronic Turbine Control

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    • Product Code: DS3800DFXA1B1C
    • Availability: In Stock
    GE DS3800DFXA1B1C DFXA Local Setpoint Adjustment Board Mark IV Speedtronic Turbine Control
    Manufacturer: GE Gas Power DS3800 Mark IV Series
    Model: DS3800DFXA1B1C (DFXA)
    Matching Hardware: DS3800DFXD Generator Regulator Main Board
    Compatible Platform: Mark IV Speedtronic gas/steam turbine rack only
    Type: Passive analog setpoint trim board, 3 banks of toggle adjustment switches, no onboard CPU/relays
    Core Function: Local manual trim for speed, AVR excitation, fuel gain analog setpoints, signal filtering & isolation, operating mode switching
    1. Product Overview
    DS3800DFXA1B1C (DFXA) is a passive analog trim daughterboard exclusive to GE Mark IV turbine control system, paired with DS3800DFXD generator regulator main board. It adopts fully passive discrete component design without chips or power supply, relying on rack backplane reference analog voltage to generate adjustable setpoint signals via three groups of toggle switches. Technicians can trim turbine speed reference, generator excitation bias and fuel control gain locally without operator station software. Built-in precision thin-film resistor divider and RC EMI filter suppress high-frequency interference from excitation SCR cabinets and variable frequency drives, with galvanic isolation between adjustment circuit and main control logic. Edge gold fingers connect to DS3800 rack backplane to transmit trimmed analog setpoints to main regulation boards for closed-loop PID calculation. Compact small-size PCB fits auxiliary slot of Mark IV cabinet, conformal coated for wide temperature industrial environment. GE stopped original new production, only refurbished and surplus spare parts available aftermarket.
    2. Full Technical Specifications
    • Adjustment Switches: 3 independent toggle switch banks (SW1 speed, SW2 AVR bias, SW3 fuel gain)
    • Working Principle: Passive resistor voltage divider, no external power required
    • Analog Output Range: -10VDC ~ +10VDC adjustable setpoint signal
    • Signal Filter: RC low-pass filter per channel for EMI suppression
    • Isolation: Resistive galvanic isolation between trim circuit and rack backplane logic
    • Backplane Interface: Edge gold finger connector for DS3800 Mark IV rack analog bus
    • Component Type: Discrete resistors, ceramic capacitors, mechanical toggle switches (no IC/relays)
    • Operating Temperature: -20℃ ~ +60℃ ventilated turbine control cabinet
    • Humidity Range: 5% ~ 95% RH non-condensing
    • Mechanical Size: Small auxiliary daughterboard, compact auxiliary slot mounting
    • Weight: ~120g
    • Certifications: CE, UL industrial power generation safety certification
    3. On-board Hardware Layout
    1. Front panel: SW1 / SW2 / SW3 three groups of manual toggle adjustment switches
    2. Precision thin-film resistor divider network for analog voltage trimming
    3. Independent RC filter circuit for each adjustment channel
    4. Edge gold finger backplane connector for analog reference & setpoint output
    5. Conformal coated PCB with printed part number DS3800DFXA1B1C silk screen
    4. System Hardware Matching Chain
    • DS3800DFXA1B1C (DFXA): Local passive analog trim setpoint board
    • DS3800DFXD: Mark IV main generator excitation & speed regulator CPU board
    • Mark IV DS3800 rack backplane: Provides analog reference voltage for DFXA operation
    • Field devices: Speed probes, generator PT voltage transformers, fuel control servo valves
    • Full signal chain: DFXA toggle switch resistance trim → analog setpoint voltage → backplane bus → DS3800DFXD regulation board → PID closed-loop control of turbine speed & generator excitation
    • Platform Separation: Cannot be installed in Mark V/VI, EX2000/2100, Honeywell System57, Emerson Ovation racks; Mark IV exclusive accessory board
    5. Typical Industrial Application Scenarios
    • Coal-fired steam turbine Mark IV control rack: On-site manual trimming of generator AVR excitation voltage offset
    • Combined-cycle gas turbine Mark IV unit: Local adjustment of turbine speed reference during startup & load test
    • Industrial cogeneration gas turbine: Manual gain trim for fuel valve control loop during static commissioning
    • Power plant overhaul maintenance: Switch to manual control mode to isolate automatic regulation circuit for valve & exciter static test
    GE Gas Power © DS3800DFXA1B1C DFXA Local Analog Trim Adjustment Board Mark IV Speedtronic Turbine Control System


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