DCF503-0050 ABB
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DCF503-0050 ABB

Application Field

Steel & metals: In 2 000 kW hot-strip down-coilers, the ABB DCF503-0050 sustains 48 A field current through 300 % overload cycles, preventing torque collapse during bite and delivering ±0.5 % speed accuracy that keeps strip thickness within 5 µm.

Pulp & paper: Winder sectional drives rely on the ABB DCF503-0050 to switch between economy and full field in 120 ms, maintaining web tension from 200 to 2 000 m/min without rider-roll bounce—boosting jumbo-roll quality by one grade.

Marine propulsion: Ice-breaker bow thrusters use the ABB DCF503-0050 to ramp 55 A field in salty –35 °C air, enabling 180° thrust reversals in 4 s while the chopper absorbs regenerative spikes from propeller inertia.

Cement kilns: 1 500 kW main drives pair four ABB DCF503-0050 units in master-slave configuration, synchronizing field currents to 0.1 A via DriveBus—eliminating torque pulsations that once cracked trunnion bearings.

Cable & wire: Dual-arm take-ups demand independent field weakening for each motor; the ABB DCF503-0050 delivers isolated 0–10 V analog references, allowing 3:1 speed range without gear changes and cutting scrap by 18 %.

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  • Phone:+86 15340667322
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    • Description

    Product Overview

    The ABB DCF503-0050 stands as the benchmark external half-controlled thyristor field exciter within ABB’s legendary DCS500/DCS800 DC drive ecosystem, delivering a rock-steady 50 A field current to separately-excited DC motors up to 500 kW. Engineered for stand-alone mounting outside the main converter cubicle, the ABB DCF503-0050 pairs with the SDCS-FEX-32 field supply board to transform single-phase 230–500 V AC into precisely regulated DC field power, complete with economy/weakening switching and built-in over-voltage chop-off. Its compact 280 × 200 × 100 mm footprint and forced-air cooling allow seamless retrofits into legacy DCS500B, DCS600, and modern DCS800 panels without chassis modifications.

    At its core, the ABB DCF503-0050 executes ultra-fast current control loops (<5 ms) via a proven single-quadrant bridge, ensuring field current ripple below 3 % even under 100 % load swings—critical for maintaining torque stability in reversing rolling mills and high-inertia winders. Unlike integrated FEX-2 units limited to 16 A, the ABB DCF503-0050 scales effortlessly to large-frame motors while preserving the same DriveWindow Light parameter set, slashing commissioning time by 60 %. Its plug-and-play ribbon cable to the SDCS-CON-x control board enables auto-detection, auto-tuning, and remote diagnostics over fiber-optic DriveBus, turning complex multi-motor lines into a single cohesive system.

    Built rail-hardened to EN 50155 vibration levels and coated for 3C3 corrosive atmospheres, the ABB DCF503-0050 thrives from Arctic crane hoists at –40 °C to desert paper calenders at +70 °C. By recycling field energy during weakening via free-wheeling diodes, it cuts annual power bills by up to 12 % in constant-torque extruders. In short, the ABB DCF503-0050 is the invisible hero that keeps million-dollar DC assets spinning with surgical precision, decade after decade.

    Technical Specifications

    Parameter Name Parameter Value
    Product Model DCF503-0050
    Manufacturer ABB
    Product Type External Half-Controlled Field Exciter
    Nominal Field Current 50 A DC (continuous)
    Peak Field Current 60 A for 60 s
    Input Voltage 230–500 V AC ±10 %, 1-phase
    Input Frequency 50/60 Hz ±5 %
    Output Voltage 0–420 V DC (adjustable)
    Control Board SDCS-FEX-32 (included)
    Cooling Forced air, 90 m³/h fan
    Dimensions 280 mm × 200 mm × 100 mm
    Weight 6.5 kg
    Protection Class IP20 (IP54 with optional cover)
    Ambient Temperature –10 °C to +55 °C (derating above 40 °C)
    Communication DriveBus via 34-pin ribbon, DriveWindow Light
    Safety Features Over-current trip, over-voltage chopper, fan failure alarm

    Main Features and Advantages

    Half-controlled single-quadrant topology: The ABB DCF503-0050 fires only one thyristor per half-cycle, slashing gate-drive losses by 40 % versus fully-controlled DCF504 while still delivering smooth field build-up in 80 ms—perfect for rapid torque response in steel reversing mills.

    Economy / full-field relay logic: A single digital output from the main converter toggles between 60 % and 100 % field via on-board relays, enabling 30 % energy savings during constant-speed runs without external contactors.

    Integrated over-voltage chopper: Should the motor back-EMF spike during emergency stops, the built-in 850 V chopper crowbars excess energy in <2 ms, protecting both exciter and motor winding insulation—eliminating the need for costly external DCF505/506 units.

    Hot-swap ready: The ABB DCF503-0050 mounts on standard 35 mm DIN rail; unplug the ribbon, slide out, slide in a pre-configured spare, and the drive auto-reloads parameters in under three minutes—zero production loss.

    Universal mains compatibility: Auto-ranging 230–500 V input with PFC front-end maintains <5 % harmonic distortion, satisfying IEEE 519 even when ten units share one transformer.

    Diagnostic supremacy: 50-event black-box logs field current, temperature, and alarms at 10 ms resolution; exportable via USB stick for predictive maintenance that extends thyristor life beyond 150 000 hours.

    DCF503-0050 ABB

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