The board supplies low-voltage power for the drive and its options while connecting armature-bridge control, high-ohmic DC/AC voltage measurement and the current-transformer interface. In D1-D4 modules it also controls the onboard field exciter and measures field current.
Application depends on the exact converter frame and rating. ABB identifies common D1-D4 use from 20 A to 1000 A with onboard field supply up to 525 VAC, while the documented D4+ 1190 A variant uses the board as an interface without field supply.
Important Notice: Confirm the complete SDCS-PIN-4B and 3ADT316300R1510 markings, DCS800 frame size, current rating, supply voltage and field-supply arrangement before work.
Important Notice: The first document is an unchanged three-page excerpt from ABB DCS800 Service Manual 3ADW000195R0701; the second provides a distinct controlled installation, commissioning and acceptance workflow. Confirm the complete installed marking before work.