RZW02.1-055-025

The Bosch Rexroth Indramat RZW02.1-055-025 braking resistor is a robust member of the RZW Braking Resistors series, engineered to absorb and dissipate regenerated energy from servo drives during deceleration. This augmented braking resistor improves system stability by efficiently handling peak motor regeneration currents in applications with large inertial loads. Enclosed within an IP20 protection housing, the unit guards against solid foreign objects while permitting natural convection cooling. The compact housing design ensures ease of installation in control cabinets for industrial automation setups. It is optimized for use with frequency converters equipped with brake choppers of the B and F type, and features a built-in monitoring function when paired with RD 500 series drives.

The RZW02.1-055-025 presents a comprehensive set of technical specifications for demanding applications. Critical performance parameters include a nominal resistance of 55 Ohms and a minimum connectable cable resistance of 5 Ohms (6 Ohms typical). The unit is rated for continuous operation at an operating factor of 0.25 and a power data rating of 55 kW with a peak power absorption capability of 50 kW. Thermal management relies on natural convection cooling, supported by a temperature coefficient of ±200 ppm/°C and a tolerance of ±5%. The peak surface temperature of 80 degrees Celsius and a thermal time constant of 100 seconds define its thermal response. A type name plate is attached for identification, and recyclable cardboard packaging is used for shipping worldwide.

Operationally, the resistor withstands ambient temperatures from 0 to 45 degrees Celsius and maintains reliable performance without forced cooling. The relative switch-on duration is set by a lead cycle of 120 seconds, ensuring safe duty cycles under high regeneration loads. The carbon film construction and robust housing support long service life in industrial environments, provided exposure to dust, humidity, and extreme vibration is minimized. Regenerated energy up to the specified peak power is safely dissipated, preventing overvoltage conditions in the servo drive.

System integration is streamlined when connecting to frequency converters with built-in brake choppers of the B and F type, particularly those in the RD 500 series which can monitor resistor loading to prevent overload. Installation within a control cabinet is recommended to maintain IP20 compliance and protect against environmental contaminants. The RZW02.1-055-025 is ideal for servo systems in industrial automation, packaging machinery, material handling, and high-inertia motor applications where dynamic braking performance and reliability are essential.