Teardown of a ABB DCS401.0900 DC motor drive. It can output an insane 900A at variable voltages, for a maximum output power of 522 kW! A very modular design by ABB, that makes almost no difference on the 2- or 4-quadrant versions of this drive.
All pictures and some details at:
https://kaizerpowerelectronics.dk/teardown/abb-dcs400-900a-522kw-dc-motor-drive-teardown/ />
The interior design consists of 5 different function parts. Heat sink with fan. SCR bridge with busbars. SCR driver board. DC motor excitation coil control and a main controller board with network interface.
The large SCR bridge, of the ABB DCS400, consists of 3 Proton-Electrotex MT3-595-18-A half-bridge modules. Each SCR module is rated for 595A mean on-state current at 1600V. It can handle up to around 20kA surge on-state current at up to 10 ms! This bridge feeds the armature of the DC motor.
