Product Description:

The RS51.1-4G-031-D-NN-FW/S150 is a basic drive controller produced by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. As a stand-alone power converter, it links three-phase mains to induction motors used in conveyors, pumps, and other automated machinery. By modulating output frequency and voltage, it supports speed regulation while fitting into control cabinets that already host PLC logic, making it a central power component rather than a motion or logic processor.

Its continuous output is rated at 31 kVA, indicating the apparent power the inverter section can deliver to connected loads under nominal conditions. Supply compatibility spans 380 to 480 V three-phase lines, so the same unit can be wired to common industrial grids without changes to the DC link arrangement. The drive applies U/f curve control; this open-loop method keeps the voltage-to-frequency ratio constant to preserve motor flux as speed changes. Thermal energy from the power semiconductors is removed by a plug-through cooler, a heat sink arrangement that projects through the panel wall and is intended for systems up to 110 kW, helping keep cabinet temperatures lower. Dynamic braking energy is discharged internally through a built-in brake chopper and resistor, eliminating the need for external hardware during rapid deceleration.

Incoming power is routed through a three-phase AC converter rectifier section that tolerates line variations of ±10 %, preventing nuisance trips when voltage sag or swell stays within that window. An integrated mains filter attenuates high-frequency emissions so additional RFI components are unnecessary. The unit belongs to design generation 1 and carries no optional technology functions, which suits applications that only require scalar speed control. Firmware is supplied in a separate subposition, so it must be specified at order time to match the control board revision.