Overview
Manuals
Power Section
RS 485 Node Setup
Field Application
Features:
- Half-controlled external field exciter for ABB DCS 500B and DCS 600 drive systems.
- SDCS-FEX-32 controller with two thyristor/diode modules for 0.3-50 A DC field output.
- RS 485 field-node interface with shielded two-wire cabling and documented five-metre limit.
DCF503-0050 must remain matched to the motor field, converter type, power and auxiliary supplies, and first/second exciter coding. It is not electrically identical to DCF504-0050.
Official source: ABB DCS 500B/DCS 600 Technical Data 3ADW000054 documents the DCF503-0050 power section, supply and output ratings, auxiliary circuit and RS 485 field-exciter configuration.
DCF503-0050 technical documentation and verified Moore Automated resources.
Important Notice: Confirm the complete model, revision and installed system before replacement.
DCF503-0050 uses an SDCS-FEX-32 control board, two thyristor/diode power modules, auxiliary power supply and line choke. The half-controlled topology is specific to this model and differs from the fully controlled DCF504-0050 design.
Verify the single-phase 110-500 V AC input, 0.3-50 A DC field requirement, auxiliary 93-253 V AC supply and protective-earth connection before wiring.
The SDCS-CON controller exchanges field-current references, actual values and settings with DCF503-0050 through a shielded two-wire RS 485 bus. Connect the conductors at X2:1 and X2:2 and the screen at X2:3 as documented.
Confirm whether the unit is field-exciter node 1 or 2 before changing coding. ABB limits the total serial-bus cable length to five metres.
Use DCF503-0050 to supply the field of a matched DC motor in a DCS 500B or DCS 600 system. A second external field exciter can support the documented two-motor load-sharing arrangement.
After replacement, confirm field-current feedback, motor flux direction, node communication and operation across the commanded speed range under the approved drive commissioning procedure.
