Product Description:

The RZR01.1-RD52-0880-P-R-FW is a frequency converter controller from Bosch Rexroth Indramat and belongs to the RZR Frequency Converters series. In an automation line, it serves as a regenerative mains inverter and sends surplus DC-link energy back to the power grid during deceleration, so braking resistors are unnecessary and heat buildup is minimized. This makes the device a power-management element in multi-axis drive cabinets that use a common DC bus and handle frequent braking events.

The converter can deliver a maximum armature current of 880 A, allowing it to absorb large transient currents generated by multiple drives while still tracking setpoint values. Its logic electronics are supplied from a control circuit that accepts 24 V ±5%, which keeps the internal DSP, gate drivers, and diagnostic circuits within their intended operating limits. Control is handled through field-oriented vector control, which separates torque-producing and magnetizing current components for fast dynamic response. The housing has an IP20 protection class, so it is intended for ventilated electrical enclosures where contact with live parts is prevented. The unit is rated for an ambient temperature range of 0–40 °C, which helps maintain semiconductor junction temperature and capacitor life within normal limits.

The unit is rated for 3K3 (DIN IEC 721-3-3), which indicates resistance to moderate dust and low humidity typical of machine rooms. Internally, the power modules use parallel circuitry so current sharing remains even across device legs while line-side harmonic content is reduced. This arrangement helps the controller operate steadily when several connected axes return energy at the same time. During normal standby, the controller draws 12 A from the supply, which helps size the auxiliary power circuit. A transport mass of 6.5 kg supports rack installation and removal without special lifting equipment.