Heavy-duty (PhD) drops to 45 kW / 87 A, which is the rating you spec for constant-torque applications like conveyors or extruders where the drive sees sustained peak demand. Light-overload (PlD) matches the normal-use power at 55 kW but current is 100 A — a middle ground for applications with occasional overloads that don't hit the heavy-duty threshold. Under UL listing the heavy-duty output is 60 Hp / 77 A and light-overload is 75 Hp / 96 A at 480 V.
Two analog inputs and two analog outputs are on board, plus 6 digital inputs and 3 digital outputs — enough for basic speed reference, feedback, and run/stop control without an expansion module. Communication is CAN; there is no industrial Ethernet interface on this variant, so if the line uses PROFINET or EtherNet/IP you'll need an optional fieldbus adapter or a different drive variant.