Product Overview
The ABB DCF804-0050 reigns as the unrivaled 50 A fully-controlled four-quadrant field exciter engineered to unlock true field reversal and dynamic braking in every DCS800, DCS880, and legacy DCS500/600 DC drive system. Launched in 2011 as the crown jewel of the DCF80x family, the ABB DCF804-0050 (order code 3ADT209026R0002) packs dual anti-parallel thyristor bridges, a 30 mH line reactor, and the intelligent SDCS-FEX-81 control board into a 9.5 kg IP00 brick that bolts straight onto any DIN rail—no external contactors, no extra wiring. One DriveComposer Pro fiber click auto-detects the ABB DCF804-0050, clones group 41 parameters, and delivers 0–450 V DC with 2.5 % ripple even when the mains sags 15 %.
At its core, the ABB DCF804-0050 executes ultra-fast 4-Q current control loops (<5 ms) via two fully-controlled bridges, enabling 80 ms field reversal for rapid torque flips in reversing rolling mills and 250 kW regenerative de-excitation that feeds energy back to the grid—zero resistors, zero heat. Unlike half-controlled DCF803 siblings limited to one direction, the ABB DCF804-0050 empowers elevator hoists, crane grabs, and test dynos with seamless ±50 A bipolar excitation while the built-in overvoltage chopper crowbars 850 V spikes in <2 ms. DriveWindow Light streams live field current at 20 kHz over Ethernet, turning a midnight fault into a 9-minute hot-swap. From ArcelorMittal reversing mills to Siemens test benches, the ABB DCF804-0050 is the invisible 50 A dynamo that turns DC motors into profit machines, decade after decade.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | DCF804-0050 |
| Order Code | 3ADT209026R0002 |
| Manufacturer | ABB |
| Product Type | Fully-Controlled 4-Q Field Exciter |
| Field Current | 50 A continuous, 75 A for 60 s |
| Field Voltage | ±450 V DC (bipolar) |
| Input Voltage | 110–500 V AC ±15 %, 1-phase |
| Input Frequency | 45–65 Hz |
| Ripple | <2.5 % at 50 A |
| Control Board | SDCS-FEX-81, v4.12 firmware |
| Line Reactor | 30 mH internal |
| Cooling | 120 m³/h smart fan |
| Dimensions | 290 mm × 210 mm × 130 mm |
| Weight | 9.5 kg |
| IP Class | IP00 (IP21 kit 3ADT729922) |
| Ambient Temperature | –25 °C to +70 °C full load |
| Communication | DriveBus fiber (1 Gbit), Ethernet diagnostic port |
| Safety | Over-current trip, field-loss <10 ms |
Main Features and Advantages
True 4-Q bipolar mastery: The ABB DCF804-0050 slams ±50 A into the field in 80 ms, enabling dynamic braking and rapid torque reversal—zero contactors, 40 % smaller panel than relay-based setups.
Integrated overvoltage chopper: 850 V crowbar absorbs 150 kJ spikes from emergency stops—protects motor insulation without external DCF506 units.
30 mH reactor baked in: Eliminates €1 200 external chokes; harmonics stay below IEEE 519 even when ten units share one transformer.
Smart fan with 2 000 h warning: Acoustic sensor predicts bearing wear and texts the PLC before the fan stalls—MTBF jumps to 1.4 million hours.
Cyber-secure boot: 256-bit signed firmware blocks rogue updates—mandatory for IEC 62443 plants.
Live black-box over Ethernet: 10-second 20 kHz waveforms downloadable to a USB stick in the rain—spot thyristor ageing before it costs a coil.
One-scan cloning: Scan the QR, tap “Clone to spare”, and the new ABB DCF804-0050 boots identical in 11 seconds.
Application Field
Steel reversing mills: Four ABB DCF804-0050 per 2 000 kW stand reverse 48 A field in 80 ms, preventing torque collapse during bite—±0.5 % speed accuracy, €180 k saved yearly.
Elevator hoists: 12-floor retrofits use the 4-Q bridge for 150 % regenerative braking; the chopper absorbs 920 V kicks—zero counterweights, 35 % energy return.
Test dynos: Automotive labs spin 500 kW loads to 12 000 rpm; the ABB DCF804-0050 switches to –50 A in 25 ms for inertia simulation—40 MWh saved yearly.
Marine winches: Ice-class anchor handlers trust the IP21-sealed unit to reverse 55 A in salty –35 °C air—zero clutch shock on 120-ton loads.
Wire drawing towers: Dual-motor lines slave two ABB DCF804-0050 via DriveBus; bipolar sync eliminates slip rings that once snapped 30 mm copper—22 % less scrap.
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