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- DCF803-0035 3ADT209023R0001
- Field Exciter
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- 320 × 105 × 173 mm
- 5 kg
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Product Overview
The ABB DCF803-0035, ordering number 3ADT209023R0001, is an external field exciter used with compatible industrial DC drive systems. Its job is to supply and regulate excitation current for the motor field circuit, allowing the drive system to manage the magnetic field required for motor operation. The unit is rated for a field output current of up to 35 A and supports a three-phase AC supply of up to 500 V, subject to the specified operating conditions. <Cite refs={[“turn758138search18″,”turn758138search20”]}/>
In a DC motor drive installation, the armature converter controls the main motor power while the field exciter handles the separate field circuit. The DCF803-0035 communicates with the armature converter through the drive’s DCSLink interface, allowing the drive control system to exchange field-current references, actual current values, and status information. This arrangement is useful in industrial equipment where field regulation must follow the operating sequence of the main drive.
The DCF803-0035 uses a half-controlled thyristor/diode bridge based on the SDCS-FEX-4 control board. It supports three-phase operation and can also be configured for single-phase operation according to the specified terminal arrangement. The line reactor, transformer where required, and line fuses are installed externally, so these components must be included in the overall electrical design rather than assumed to be built into the exciter. <Cite refs={[“turn758138search6″,”turn758138search20”]}/>
For maintenance teams, this model is particularly relevant when servicing a compatible DCS800 drive system that uses an external 35 A field exciter. Before replacement, engineers should confirm the ordering number, input supply arrangement, field-current requirement, communication connection, and associated protective components. The unit’s 35 A rating alone does not establish suitability for every motor field circuit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | DCF803-0035 |
| Ordering Number | 3ADT209023R0001 |
| Product Type | Field Exciter |
| Product Family | ABB DCF803 |
| Input Supply | 3 × 500 V AC, maximum specified supply class |
| Field Output Current | Up to 35 A DC |
| Converter Type | Half-controlled thyristor/diode bridge |
| Control Board | SDCS-FEX-4 |
| Communication Interface | DCSLink |
| Operating Configuration | Three-phase or single-phase, as specified |
| External Components | Line fuses and line reactor; transformer as required by the application |
| Dimensions | 320 × 105 × 173 mm |
| Weight | 5 kg |
Product Features
- 35 A field-current capability: Supports field circuits whose required current falls within the exciter’s specified operating range.
- Three-phase AC input: Supports the specified supply arrangement for industrial field-excitation applications.
- Single-phase operating option: Can be configured for single-phase operation using the designated terminals and the applicable setup procedure.
- SDCS-FEX-4 control board: Provides the synchronization, current-control, and measurement functions required by the field converter.
- DCSLink communication: Exchanges control references, actual field-current information, and status data with a compatible armature converter.
- Automatic current-measurement scaling: The current-measurement circuit adjusts according to the selected rated field-current configuration.
- External protective arrangement: Uses separately installed line protection and associated input components selected for the application.
- Drive-system integration: Functions as an external field converter rather than a standalone motor-speed controller.
Working Principle
The DCF803-0035 converts AC input power into controlled DC excitation current for the motor field winding. Its half-controlled thyristor/diode bridge regulates the energy delivered to the field circuit, while the SDCS-FEX-4 control board manages synchronization, current measurement, and field-current control.
A typical drive arrangement follows this path:
AC Supply → External Input Protection and Line Components → DCF803-0035 → Motor Field Winding
The armature converter coordinates the field exciter through DCSLink communication. It sends the required field-current reference and receives actual-current and status information, allowing the main drive controller to coordinate field operation with the motor’s operating condition. <Cite refs={[“turn758138search6″,”turn758138search20”]}/>
For example, when a DC motor drive starts or changes its operating point, the field circuit must establish the required magnetic excitation. The DCF803-0035 regulates field current in response to the control reference, while its measurement and control functions help the drive monitor the actual response. The result depends on the motor field winding, supply conditions, control parameters, and the overall drive configuration.
The exciter does not replace the armature converter and does not independently perform the complete motor-control sequence. It handles the field circuit, while the wider drive system coordinates armature current, speed or torque commands, protection, and operating transitions.
Correct input configuration is essential. The supply arrangement, line reactor, fuses, and any required transformer must match the electrical design. The field-current rating must also be checked against the motor’s specified excitation requirements before commissioning.
Role in the DC Drive Control Architecture
The DCF803-0035 occupies the field-power stage of a compatible DC drive system. It supplies regulated excitation current and communicates with the armature converter, which coordinates field operation with the main motor-control process.
| System Element | Function |
|---|---|
| AC Supply | Provides input power for the field converter |
| External Line Fuses | Protect the input circuit according to the equipment design |
| Line Reactor and Transformer, Where Required | Support the specified input supply arrangement |
| DCF803-0035 Field Exciter | Converts AC input power into controlled field current |
| SDCS-FEX-4 Control Board | Handles synchronization, current control, and measurement functions |
| DCSLink Interface | Exchanges commands, actual values, and status information |
| Armature Converter | Coordinates field excitation with the main drive operation |
| Motor Field Winding | Produces the magnetic field required for motor operation |
| Drive Monitoring and Protection | Supervises relevant operating conditions and fault responses |
The exciter must be matched to the drive’s field-current requirements and communication configuration. A replacement should not be commissioned until the input wiring, external protective components, DCSLink connection, and field-current settings have been checked.
Industrial Applications
| Application | Practical Use |
|---|---|
| DC Motor Drive Systems | Supplying controlled excitation current to compatible DC motors |
| DCS800 Drive Installations | Serving as an external field converter in supported drive configurations |
| Industrial Rolling Equipment | Supporting field excitation in compatible DC drive arrangements |
| Material Processing Machinery | Maintaining the motor field circuit in applicable DC drive systems |
| Heavy Industrial Drives | Providing field power where the required excitation current is within the unit’s rating |
| Industrial Winding and Unwinding Equipment | Supporting field-controlled DC motor operation where specified |
| Drive Retrofit Projects | Replacing an existing DCF803-0035 after confirming the complete electrical configuration |
| Preventive Maintenance | Checking field-current regulation, connections, protective components, and communication status |
Installation and Maintenance
- Verify the complete model reference: Confirm DCF803-0035 and ordering number 3ADT209023R0001 against the installed unit and drive documentation.
- Isolate the complete drive system: Follow the approved isolation and discharge procedure for the armature converter, field circuit, and auxiliary supplies. Verify the absence of hazardous voltage before touching the wiring.
- Check the motor field rating: Confirm the field winding’s required current and voltage against the exciter’s permitted operating range. Do not select the unit using the motor’s armature rating alone.
- Confirm the input supply arrangement: Check whether the installation uses three-phase or single-phase operation. Verify the supply voltage and terminal connections against the approved circuit diagram.
- Inspect external line components: Confirm the correct line fuses, line reactor, and transformer arrangement where required. These components are not all integrated into the exciter enclosure.
- Check field-circuit wiring: Inspect the field output conductors and terminals for loose connections, insulation damage, or signs of overheating. Confirm polarity and terminal identification before energizing the circuit.
- Inspect the mounting and ventilation: Ensure the unit is securely mounted and that its cooling path is unobstructed. Keep the surrounding installation within the specified environmental conditions.
- Verify the control-board configuration: Check the SDCS-FEX-4 board and associated settings against the intended field-current configuration. Confirm that the current-measurement arrangement matches the motor’s rated field current.
- Check DCSLink communication: Verify the connection between the field exciter and armature converter. Investigate communication or status errors before attempting normal operation.
- Review field-current parameters: Confirm the commanded field current and relevant limits against the motor and drive configuration. Avoid changing parameters without understanding their effect on the field circuit.
- Test the operating sequence: During commissioning, verify that the field current follows the required reference and that actual-current feedback and status information reach the armature converter correctly.
- Record commissioning results: Document the input supply arrangement, protective components, field-current settings, communication checks, and measured operating results for future maintenance.
Compatible System Components
| Component | Function |
|---|---|
| ABB DCS800 Armature Converter | Coordinates the field exciter with the main DC drive operation |
| SDCS-FEX-4 Control Board | Provides field-converter control, synchronization, and measurement functions |
| Motor Field Winding | Receives the regulated DC excitation current |
| DCSLink Communication Connection | Carries field-control references, actual values, and status information |
| External Line Fuses | Protect the field-converter input circuit |
| Line Reactor | Forms part of the specified input arrangement |
| Input Transformer, Where Required | Adapts the supply to the field converter’s application requirements |
| Field Circuit Wiring and Terminals | Connects the exciter output to the motor field circuit |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| ABB DCF803-0016 / 3ADT209027R0001 | 16 A Field Exciter | Lower-current external field converter; verify the motor’s field-current requirement |
| ABB FEX-425-Int / 3ADT209022R0001 | 25 A Field Exciter | Alternative field-excitation arrangement; check whether the installation requires an internal or external unit |
| ABB DCF803-0035 / 3ADT209023R0001 | 35 A Field Exciter | Reference model for the specified external field-converter application |
| ABB DCF503/4B | Field Exciter | Related field-excitation equipment referenced in DC drive service documentation; verify the exact version and ratings |
| ABB DCS800 | DC Drive Product Family | Main drive family used with compatible external field converters |
| ABB SDCS-FEX-4 | Field Exciter Control Board | Control board associated with the DCF803-0035 field-converter design |
Key Advantages
- Field-current output up to 35 A DC.
- Three-phase or configured single-phase operation.
- SDCS-FEX-4 control board for current regulation and measurement.
- DCSLink communication with a compatible armature converter.
- External field-converter arrangement for supported DC drive systems.
Technical FAQs
What is the difference between the DCF803-0035 and DCF803-0016?
Both are external field exciters in the DCF803 family, but their field-output current ratings differ: the DCF803-0035 supports up to 35 A, while the DCF803-0016 is rated for up to 16 A. Selection must be based on the motor field requirements and the drive configuration.
Can the DCF803-0035 operate from a single-phase supply?
The unit supports single-phase operation when configured using the specified terminal arrangement. The supply wiring, input protection, and operating parameters must follow the applicable installation procedure.
Why does the DCF803-0035 communicate with the armature converter?
DCSLink allows the armature converter to coordinate field excitation with the main drive operation. The interface carries field-current references, actual-current information, and status data used by the drive-control system.
Which external components should be checked when replacing the field exciter?
Check the input fuses, line reactor, transformer where required, field wiring, and communication connection. These items form part of the overall field-excitation installation and must match the supply and motor requirements.