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SDCS-FEX-4

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The ABB SDCS-FEX-4 is a universal control board for field exciters, enabling 3-phase/single-phase operation with automatic current scaling for DCS800/DCS880 converters.
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Technical specifications for SDCS-FEX-4

  • Manufacturer:
    ABB
  • Part Number:
    SDCS-FEX-4
  • Product Family:
    ABB Drives
  • Control aux supply:
    24 V DC
  • Storage Temperature:
    -40°C ~ +85°C
  • Relative Humidity:
    5% - 95% (Non-condensing)
  • Tightening torque:
    1.5 - 1.7 Nm
  • cross sectional area:
    6 mm²/ AWG 10
  • Field current measurement channel:
    2, 5 A and 35 A
  • Operation:
    Supports 3-phase and single-phase
  • Installation:
    Plug-in board for field exciter module; interfaces with power part of exciter (external or internal).
  • Compatibility:
    Works with DCS800 / DCS880 converters (external and internal field exciters
  • 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.
Description
The ABB SDCS-FEX-4 Control Board is a core universal control module designed for ABB field exciters, serving as the operational backbone for models including DCF803-0016, FEX-425-Int, and DCF803-0035—all half-controlled 3-phase converters.  Equipped with integrated synchronization and current control capabilities, the board features an automatically scaling current measurement circuit that adapts to the motor’s rated field current, ensuring precise and tailored excitation control.  It supports both 3-phase and single-phase operation (with terminals U and W connected for single-phase use, and an autotransformer recommended for voltage adaptation), offering flexible integration across industrial setups.

As a plug-in board for field exciter modules, it seamlessly interfaces with the power part of external or internal exciters, leveraging a 3-phase half-controlled bridge with a free-wheeling diode in its power section.  The board enables full control and monitoring by the armature converter via drive-to-drive communication, ensuring cohesive system coordination.  Compatible with ABB DCS800 and DCS880 converters, it accommodates field current measurement channels of 2A, 5A, and 35A, with terminal specifications including 6mm²/AWG 10 conductor support and a tightening torque of 1.5-1.7Nm.

Built for industrial resilience, the SDCS-FEX-4 operates within a storage temperature range of -40°C to +85°C and withstands 5%-95% non-condensing humidity.  It powers field exciters with a 24V DC control auxiliary supply, maintaining reliable performance in harsh environmental conditions.  Whether integrated into external exciters (e.g., DCF803-0035) or internal units (e.g., FEX-425-Int for D4+/D5 converters), it delivers consistent, accurate control for motor excitation systems.
Alternative Names
SDCSFEX4 SDC-FEX-4 SDCS FEX-4 SDCS-FEX-04 SCDS-FEX-4 SDCS-FEX-IV
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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.
Which converters is it compatible with?
It works with DCS800 and DCS880 converters, supporting both external and internal field exciters.
Can it operate in single-phase mode?
Yes, SDCS-FEX-4 supports both 3-phase and single-phase operation; for single-phase, terminals U and W should be connected, with an autotransformer recommended for voltage adaptation.
What type of power interface does it use?
It interfaces with a 3-phase half-controlled bridge with free-wheeling diode; line fuses, reactors, and transformers are installed externally depending on the configuration.
What is the auxiliary supply requirement?
The control aux supply is 24 V DC.
What are the installation requirements?
SDCS-FEX-4 is a plug-in board installed in the field exciter module and interfaces with the exciter’s power section; wiring uses 6 mm² (AWG10) cross-section and torque of 1.5–1.7 Nm.