What you're sourcing
Order code ACS550-U1-075A-2 is the string on record; place that full code on the PO line, not a truncated family prefix. Listed weight is 31.75 kg — a one-person lift with a panel-cutout handle, not a bench-top unit. Confirm the panel has the structural support and cooling clearance the chassis needs before specifying it into a retrofit.
Where this class is used
ACS550-U1 series drives are applied to pumps, fans, conveyors and similar industrial motor loads where the standard sensorless vector control and PID macro are enough — typical water/wastewater, HVAC and materials-handling cells. The U1 suffix is the IP21 wall-mount format; for harsher environments the U2 (IP54) variant is the alternative the family offers.
Field-engineering angles worth raising before you commit the BOM
Two questions drive fit on this chassis before commissioning: motor cable length versus the drive's reflected-wave limit, and the harmonic/EMC profile at the line side. Long motor leads amplify dV/dt at the motor terminals; on this family the conventional answer is a dV/dt output filter when the run exceeds the chassis limit, otherwise winding stress builds silently. Confirm the panel's SCCR and the upstream protective device's let-through against the drive's input ratings before energizing. Grounding and cable routing matter as much here as on any ACS550 build: keep the motor cable shield bonded at the drive end and the motor end, separate the motor cable from signal and control runs in the gland plate, and verify the PE conductor is sized to the drive's fault-current contribution. Skipping the shield termination is the usual source of bearing currents and erratic analog feedback on retrofit installs.