RZW01.1-022-NNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW01.1-022-NNN is part of the RZW Braking Resistors series and is designed with an operating power of 22 kW. It has a resistance of 11.7 ohms and connection terminals type C-F. The minimum conductor cross-section recommended is 10 mm², or AWG 6.
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Product Description:
The RZW01.1-022-NNN is a resistor unit manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. Installed on the DC link of a servo inverter, it converts surplus kinetic energy into heat during rapid motor deceleration. This conversion helps prevent DC-link overvoltage trips and protects the drive electronics when a motor returns energy to the inverter. Its modular housing supports straightforward panel mounting near converter cabinets while allowing heat to dissipate during repetitive operating cycles.
The unit has a thermal dissipation rating of 22 kW, indicating the maximum regenerative power it can convert into heat without exceeding its permitted thermal limit. Its resistance is 11.7 Ω, providing a fixed impedance that allows the connected drive to calculate braking current and manage deceleration ramps. Field wiring connects to the C-F terminals, which provide designated connection points for the braking circuit. The protective earth conductor requires a minimum cross-sectional area of 10 mm² (AWG 6) to carry fault current and withstand the thermal stress associated with frequent braking. The allowable duty factor follows the ED design classification, permitting repeated braking pulses when the average load remains within the applicable thermal cycle.
The mechanical configuration uses Design 1, which indicates the housing arrangement and mounting-slot pattern for this unit. The product belongs to Line 1, corresponding to its position within the applicable product line and its associated installation format. Adequate clearance around the housing is necessary so generated heat can move away from the resistor without warming nearby drive components excessively. The resistor should be installed where its terminals remain accessible and where surrounding equipment does not obstruct natural airflow. Its panel-mounted arrangement also keeps the braking circuit close to the inverter, helping limit unnecessary cable length between the DC-link switching circuit and the resistor unit.
