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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power sources premium, hard-to-find ABB DCF803-0035 replacement hardware, providing plant engineers with a dependable inventory stream for obsolete components to ensure uninterrupted system operations.

        DCF803-0035

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        1001 reviews ｜ Need a Specific Revision?
        The ABB DCF803-0035 is a half-controlled 3-phase field exciter, delivering 35A DC output with flexible input and reliable system integration.
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        Ships by Thursday, October 29
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for DCF803-0035

        • Manufacturer:
          ABB
        • Part Number:
          DCF803-0035
        • Product Family:
          ABB Drives
        • Product Type:
          External Field Exciter Unit
        • Stock:
          1
        • AC input voltage:
          110 V -15% - 500 V +10%; single or 3-phase
        • AC input current:
          < DC output current
        • Frequency:
          Same as DCS converter
        • AC isolation voltage:
          600 V
        • Line reactor:
          External
        • Line fuses:
          KTK25 for FEX-425-Int; external for DCF803-0016 and DCF803-0035
        • DC output current:
          0.3 A - 35 A
        • Powerloss:
          < 130 W (at rated current)
        • DC input voltage:
          24 VDC
        • DC input current:
          < 200 mA supplied via X51 of SDCS-DSL-4
        • DC output current:
          35 A
        • max. cross sectional area:
          6 mm²/ AWG 10
        • min. cross sectional area:
          6 mm²/ AWG 10
        • Tightening torque:
          1.5 - 1.7 Nm
        • Short circuit protected:
          250 mA
        • Buffering:
          10 ms
        • Weight:
          4.18 kg
        • Estimated shipping dimensions:
          16.9x10.5x32cm
        • Tariff Code:
          8537101190
        • Country of origin:
          Sweden
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Applications Performance & Efficiency Safety & Compliance

        Features:

        • High-Speed DCSLink Smart Communication Integration
        • Autoscaling Burden Resistors for Precision Tuning
        • Dual-Configuration Micro-Processor Control Logic
        The ABB DCF803-0035 features an integrated high-speed DSL interface powered by CAN technology that operates at 500 kBaud to ensure real-time communication with the host converter. This eliminates analog latency by transmitting critical references, status bits, and actual field current values cyclically, ensuring instantaneous control coordination.

        The ABB DCF803-0035 utilizes intelligent autoscaling hardware that automatically adjusts its internal current-measurement burden resistors to match the motor's actual rating. This self-configuring design maintains exceptional current-loop resolution and signal-to-noise ratios even when operating at a minimum field current low boundary of 0.3A.

        The ABB DCF803-0035 is driven by an advanced H8 micro-controller that handles phase synchronization, digital PI current regulation, and automated fault-handling functions natively. It supports both three-phase grid line structures and single-phase transformer hookups, giving application engineers extraordinary flexibility during retrofits.

        The DCF803-0035 ABB External Field Exciter Unit for DC Drives may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        ABB DCF803-0035 External Field Exciter Unit for DC Drives Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        ABB DCF803-0035 External Field Exciter Unit for DC Drives

        General

        • Manufacturer ABB
        • Model DCF803-0035
        • Condition New Original ready stock
        • Product Family DCF804-0050,DCF503-0050,DCF506-0520-51-0000000
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Metal Processing & Hot/Cold Rolling Mills: In heavy metallurgical plants, large DC motors run with highly erratic load profiles. The module provides the rapid field current adjustments needed to keep torque stable during heavy metal slab impacts.
        • Mining Industry Draglines & Cement Kilns: Massive rotary equipment demands extremely high starting torque. This device manages the high inductive loads of motor field windings safely, maintaining optimal magnetic flux under low-speed, high-torque demands.
        • Pulp, Paper, & High-Speed Printing Lines: Web processing requires perfectly uniform tension. The module's high-speed synchronization ensures stable field dynamics, preventing any micro-slippage or paper tearing on the production line.
        • Industrial Battery Charging & High-Power Magnets: Beyond motor operation, the half-controlled 3-phase bridge topology can be adapted as a standalone, current-regulated power supply for lifting electromagnets and heavy industrial battery banks.
        • Autoscaling Burden Signal Resolution: The integrated auto-scaling function alters internal measurement scaling seamlessly based on motor data, ensuring the current control loop maintains high accuracy down to 0.3 A.
        • Low Thermal Footprint & Minimized Losses: Emitting less than 130 W of heat at its full 35 A continuous load, this unit maximizes electrical efficiency and minimizes cabinet cooling requirements.
        • Ultra-Fast Voltage Reserve Response: The 3-phase half-controlled thyristor configuration provides ample voltage reserves, allowing the digital PI controller to force current into highly inductive motor fields rapidly.
        • Integrated Drive-Driven Auxiliary Supply: By drawing its 24 V DC auxiliary control power directly from the master drive's DSL-4 interface, the unit eliminates the need for separate 115V/230V control transformers, streamlining system architecture.
        • High Galvanic Isolation Safety Standard: Featuring a certified 600 V AC electrical isolation rating between the power circuit and the control electronics, the unit prevents high-voltage grid anomalies from damaging sensitive control boards.
        • Dual-Channel High-Ohmic Ground Fault Tracking: The hardware features a 2-channel measurement circuit alongside a high-ohmic AC line connection (approx 1.6 MΩ), providing robust residual current and ground fault isolation tracking.
        • Coordinated Ultra-Rapid Semiconductor Protection: The recommended external UR fuses and line reactors are fully certified to limit short-circuit energy (I²t), protecting the thyristor modules from catastrophic line faults.
        • Comprehensive Safe Fail-Safe Drive Monitoring: Because the host armature drive continually tracks parameter status bits via DCSLink, any fault instantly triggers a safe-stop sequence, preventing dangerous motor overspeed conditions.
        Description
        The ABB DCF803-0035 Half Controlled 3-Phase Converter is a specialized field exciter designed for motor field excitation, built on the universal SDCS-FEX-4 control board. It features integrated synchronization, current control, and automatic current measurement scaling—adapting seamlessly to the motor’s rated field current for precise and consistent operation. Compatible with both 3-phase and single-phase setups (single-phase via U and W terminal connection), it offers versatile integration into industrial drive systems.

        Operating with an AC input voltage range of 110V (-15%) to 500V (+10%) and frequency matching the DCS converter, the converter delivers a stable 35A DC output current (adjustable 0.3A-35A) with power loss <130W at rated load. It requires external line reactors and line fuses, with a 600V AC isolation voltage ensuring electrical safety. The DC input (24VDC, <200mA supplied via X51 of SDCS-DSL-4) and output terminals support 6mm²/AWG 10 conductors, with a recommended tightening torque of 1.5-1.7Nm.

        Equipped with 250mA short-circuit protection and 10ms buffering, the DCF803-0035 ensures operational resilience. Fully controlled and monitored by the armature converter via drive-to-drive communication, it enables seamless system coordination. As a half-controlled 3-phase converter, it balances efficiency and control precision, making it ideal for industrial motor excitation applications requiring reliable performance and flexible configuration.
        Alternative Names
        DCF8O3-OO35 DCFB03-0035 DCF8030035 DCF8O3OO35 DCFB030035 DCF804-0050 DCF503-0050 DCF506-0520-51-0000000
        Technical notes
        The ABB DCF803-0035 must be installed with an external line reactor (such as the ND30 or KLR 45 CTB) and semiconductor fuses because it does not contain internal line filters or reactors within its compact housing. For single-phase configurations, using an external T3 series autotransformer is strongly recommended to adapt voltage levels and significantly mitigate output voltage ripple.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        What communication protocol does the ABB DCF803-0035 use, and what hardware board is required on the master drive side?
        The ABB DCF803-0035 utilizes the DCSLink communication protocol, which is a high-speed, isolated industrial interface based on the CAN bus standard operating at 500 kBaud. On the host armature drive side, an SDCS-DSL-4 drive-to-drive board must be installed to facilitate this communication link. This connection provides cyclic data transfer for field current references, actual values, and fault reset control logic.
        How do you configure the ABB DCF803-0035 for single-phase AC input operation, and what parameters or hardware adjustments are needed?
        To run the ABB DCF803-0035 on a single-phase supply, you must physically bridge input terminals U1 and W1 together according to the official manual diagrams. In the drive software, firmware parameters under Group 45 (specifically 45.22 and 45.23) must be configured to notify the controller of the single-phase network topology. Furthermore, an external single-phase autotransformer (T3 series) is highly recommended to adapt voltages and limit output ripple.
        What are the exact terminal cross-section limitations and wiring requirements for the ABB DCF803-0035 power connections?
        The ABB DCF803-0035 main power terminals (X100 and X101) have a physical structural capacity that accepts a maximum wire cross-section up to AWG 7. However, for a standard 35 A continuous rated excitation load, the recommended minimum specification under DIN VDE 0276-1000 is 6 mm² / AWG 10. The PE grounding connection utilizes an M6 screw stud that should be tightened securely to a torque specification of 1.5 - 1.7 Nm.
        How deep are the diagnostics on the ABB DCF803-0035, and how does the main drive identify a field circuit fault?
        The ABB DCF803-0035 features advanced diagnostic depth managed by its flash-programmed H8 micro-controller, which tracks actual current through a 2-channel measurement loop and samples high-ohmic AC synchronization voltage. Faults like field overcurrent, loss of AC synchronization, or communication timeouts are processed instantly by internal fault logic and transmitted via DCSLink to the armature converter. Additionally, when mounting the unit on a sub-plate, a dedicated 5 mm minimum diameter hole must be provided directly underneath to accommodate the external thermal sensor loop.
        What are the environmental, ambient temperature, and power loss limits during continuous operation of the ABB DCF803-0035?
        The ABB DCF803-0035 is certified for continuous operation up to an ambient temperature of +50°C under nominal ratings. It can safely operate up to +55°C provided an appropriate current-derating calculation factor is applied within the engineering phase. At a full continuous output current of 35 A, the unit generates a total internal power loss of < 130 W, which must be accounted for in cabinet ventilation calculations.

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