Product Description:

The RD52.2-4B-015-L-A2-FW/S122 is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Deployed between the plant’s mains and an induction or synchronous motor, it converts fixed-frequency three-phase power into a regulated output that follows speed or torque references from the host PLC. By closing the current and voltage loops internally, the unit streamlines motion tasks such as conveyor regulation, pump modulation, and positioning duties across automated cells. This arrangement gives the motor smooth speed changes and stable torque response when process loads vary during normal operation. It also supports repeatable behavior in applications that need controlled ramps and consistent output across shifting duty cycles.

Designed for universal plant power systems, the controller accepts 380 to 480 V from a three-phase AC feeder and remains functional with line swings of ±10 %. Within this range, it can deliver up to 15.0 kW of mechanical output to the connected motor. Dynamic regulation is executed with field-oriented vector control, allowing precise flux and torque production rather than an open-loop V/f approach. As a result, the controller can respond more accurately to changing motor demand than simple scalar control methods. Generation 2 adds a dedicated standby power terminal, which allows control functions to remain available while the main drive section is managed separately.

Thermal energy from the IGBT bridge is removed through forced air cooling, so the unit can sustain rated current in standard cabinets. During deceleration, a built-in brake chopper directs excess DC-bus energy to external resistors, helping prevent overvoltage trips. Conducted emissions on the supply side are attenuated by an integrated mains filter, reducing the need for additional RFI components. A starting lockout function blocks inverter gating until external interlocks and standby circuits confirm that the motor zone is clear for energization. This lockout supports controlled startup sequencing when external permissive signals are used.