Product Description:

The RD52.1-7N-090-L-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. In automation lines, it acts as the regulating interface between an industrial inverter DC bus and an AC motor, allowing closed-loop speed and torque control that matches process requirements. By converting DC-link energy into a three-phase output, the unit provides a programmable node that synchronizes motor behavior with PLC or motion controller commands in conveyors, extruders, and similar equipment.

This model uses field-oriented vector control, so current components are regulated independently for accurate torque production even at low shaft speeds. The input DC link must remain within 530 to 670 V, a span that corresponds to common three-phase rectifier modules on 400 V supply systems. The supply interface uses an inverter DC connection, which eliminates an internal rectifier and keeps heat dissipation concentrated in the central DC power section. Cooling is handled by forced-air cooling, with fans drawing cabinet air across the heat sink to maintain semiconductor junction temperatures. The power section is rated for a continuous output of 90 kW, so cabinet airflow must be sufficient at this load level. For rapid deceleration events, the unit comes without a built-in brake chopper, so excess regenerative energy must be handled by an external resistor and chopper.

An auxiliary supply terminal delivers 24 V standby power, allowing the control electronics and fieldbus interface to remain active during line isolation for diagnostic or safety routines. The unit is in design generation 1, which supports compatibility with first-generation RD52 option cards and I/O kits. It requires a separate firmware order, allowing the software revision to be matched to the plant communication protocol and established parameter set.