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SDCS-FEX-2

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The ABB SDCS-FEX-2 is a digital field exciter board for ABB DCS converters, delivering adjustable field current via a half-controlled bridge and digital control.
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Technical specifications for SDCS-FEX-2

  • Manufacturer:
    ABB
  • Part Number:
    SDCS-FEX-2
  • Product Family:
    ABB Drives
  • AC input voltage:
    10 V -15%...500 V +10%; single phase
  • AC input current:
    ≤ output current
  • AC isolation voltage:
    600 V
  • Frequency:
    same as DCS converter module
  • DC output current:
    0.3 A...8 A for armature converter module from 25 A to 75 A; 0.3 A...16 A for armature converter mod. from 100 A to 2000 A
  • Power loss at IF rated:
    ≤40 W
  • Output IACT:
    Uout = 4 V *Iact / I lim; I lim = 3A, 5A, 7A, 9A, 11A, 13A, 15A, 17A
  • Terminal X1:Cross sectional area:
    4 mm²
  • Weight:
    0.75 kg
  • Estimated shipping dimensions:
    27.8x11.5x6cm
  • 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-2 (and FEX-2A) Field Exciter Board is an integrated component designed for ABB DCS converter systems, combining a power section and control board to deliver precise field excitation for armature converter modules. Its core function is to regulate field current via a fully digital control system: the μ-processor receives input from the power section and control signals (via flat cable X14 from the SDCS-CON-2), then generates firing pulses for the power modules—each consisting of a diode and thyristor wired as a half-controlled bridge—to supply adjustable DC output current to the converter’s field winding. The board automatically selects current ranges (3A to 16A) to optimize resolution based on the required field current, ensuring efficient and accurate excitation control.

Electrical parameters include a single-phase AC input voltage range of 110V (-15%) to 500V (+10%), with AC isolation voltage rated at 600V; DC output current spans 0.3A to 8A for 25A–75A armature converters and 0.3A to 16A for 100A–2000A armature converters. Power loss at rated field current (IF) is ≤40W, and the output IACT is scaled as Uout = 4V * Iact / I lim (with I lim options: 3A, 5A, 7A, 9A, 11A, 13A, 15A, 17A). Terminal X1 accepts wiring with a 4mm² cross-sectional area, and the board operates at the same frequency as the host DCS converter module. It is compatible with DCS converter modules of type C1, C2, and A5 (excluding A6/A7/C4), featuring electrical isolation (600V AC) to prevent cross-interference with other converter components.

Installation requires mounting the SDCS-FEX-2 inside the armature converter module, adjacent to the SDCS-POW-1 electronic power supply, following ABB’s mechanical fit specifications for C1/C2/A5 racks. The board adheres to industrial environmental standards for converter auxiliary components (consistent with DCS series operating conditions), including temperature ranges suited for industrial settings and non-condensing humidity; it complies with standard altitude ratings for indoor industrial installations. Safety is enhanced by its integrated digital control, which ensures precise current regulation and fault monitoring, while the half-controlled bridge design provides robust power delivery with minimal loss. No external power supply is needed, as the board draws control power from the SDCS-CON-2 and input power from the converter’s AC supply.
Alternative Names
SDCSFEX2 SDCS FEX 2
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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.
What is the input voltage range for the SDCS-FEX-2?
110 V -15% to 500 V +10%, single-phase AC.
What is the maximum AC input current?
The AC input current is limited to the output current of the board.
What isolation voltage does the board support?
AC isolation voltage is 600 V.
What is the DC output current range?
0.3 A–8 A for 25–75 A armature modules, 0.3 A–16 A for 100–2000 A armature modules.
How is the power loss rated?
Power loss at IF rated is ≤40 W.
Where should the SDCS-FEX-2 be mounted?
Inside the armature converter module, alongside the SDCS-POW-1 power supply, for DCS modules type C1, C2, and A5.

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