What this drive is
The ABB ACS800-U1-0140-5+P901 is a wall-mount AC drive from the ACS800-U1 series, sitting on the Motor Drives line under the broader Drives category. It carries the +P901 suffix that ABB uses to denote an option-package build, so two units with the same base code can differ in their delivered configuration — confirm the option code on the nameplate against the PO before commissioning.
Where the class sits in a panel
ACS800-U1 drives are specified for fixed-speed induction and permanent-magnet motor applications where direct torque control (DTC) is the operating mode — speed, torque, and process-control loops are run inside the drive itself rather than handed back to the controller. The +P901 suffix is the field that decides what option content ships: control board revision, I/O and feedback configuration, and fieldbus adapter presence all sit under that code, so it is the first thing to verify against the nameplate when a unit arrives at the dock or comes out of a surplus crate.
What the +P901 option actually decides
The +P901 suffix governs the option content of this specific build — adaptive programming, extended I/O, and any fieldbus adapter fitted at the factory all sit under that code. On receipt, cross-check the suffix on the unit's nameplate against the PO line before energising; an option mismatch shows up at first power-on as a missing parameter group or a fieldbus that never comes up, not as a drive fault.