RZW02.1-200-025
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The RZW02.1-200-025 braking resistor features a power rating of 200 kW, a minimum connectable resistance of 1.6 Ω, and operates at up to 80°C surface temperature. Part of the RZW Braking Resistors series from Bosch Rexroth Indramat, it offers IP20 protection and supports a 25% duty cycle for optimal performance.
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Product Description:
Bosch Rexroth Indramat manufactured the RZW02.1-200-025. A high-power component of the RZW family, the RZW02.1-200-025 brake resistor is designed for dynamic energy management in high-inertia industrial motion systems. It’s designed to convert kinetic energy into thermal energy during motor deceleration phases and has a 200 kW power dissipation capability. This rating indicates the maximum continuous thermal load the resistor can withstand without going above thermal or structural limits. In practice, that means 200 kJ of energy dissipation per second, which is needed for high-frequency, high-torque braking applications. Systems with high mechanical inertia and fast stopping cycles generate a lot of transient electrical energy that has to be absorbed and neutralized is a good fit for the high-power handling of the resistor. A basic electrical characteristic that increases its power rating is the 1.6-ohm minimum connectable resistance. The maximum current that can flow through the resistor at a given voltage is determined by this parameter.
A lower resistance allows more current, and the resistor can dissipate energy faster while keeping thermal stability according to Ohm’s law and the power dissipation formulas (P = I²R and P = V²/R). To ensure the energy dissipation doesn’t exceed the material or structural limits of the component, the 1.6-ohm value was chosen to balance current flow with thermal constraints. This resistor has thermal performance as a top priority, especially with its 200 kW rating. Its surface temperature, which is controlled by internal thermal resistance, material conductivity and heat exchange efficiency, can rise to 80°C at full load. The thermal response is described by the formula Q = I²Rt, where Q is the thermal energy collected. Using thermally robust materials and surface treatments that are oxidation and fatigue-resistant is necessary to be able to withstand high surface temperatures without structural damage.
The resistor is protected from overheating and long-term stability by the 80°C surface temperature threshold, which guarantees operation within specified thermal margins. In electrical enclosures with tight spaces where ambient heat loads can stress critical components, this is especially important. Its IP20 ingress protection and 25% duty cycle address mechanical and environmental as well as electrical and thermal issues. Although it doesn’t provide protection against liquids, the IP20 certification means it’s protected against solid objects larger than 12.5 mm, so no accidental human contact and big particles can enter. This limits its application to dry, clean industrial areas. The 100-second thermal time constant, which is the time the resistor can run at full power in a repeating cycle, is closely related to its 25% duty cycle rating. Premature failure is avoided by having enough cooling time to avoid cumulative heat accumulation.
Frequently Asked Questions about RZW02.1-200-025:
Q: What is the power rating of the RZW02.1-200-025 braking resistor?
A: The RZW02.1-200-025 braking resistor from Bosch Rexroth Indramat has a power rating of 200 kW, allowing it to dissipate significant energy in braking applications.
Q: What is the minimum connectable resistance of this braking resistor?
A: The RZW02.1-200-025 features a minimum connectable resistance of 1.6 Ω, which provides flexibility in system design for various industrial setups.
Q: What is the maximum surface temperature this resistor can operate at?
A: The braking resistor can withstand surface temperatures up to 80°C during full operation, making it suitable for high-energy dissipation environments.
Q: What protection class does the RZW02.1-200-025 offer?
A: It offers an IP20 protection class, which makes it suitable for use in controlled industrial environments where dust and other contaminants are not a major concern.
Q: What is the duty cycle for this braking resistor?
A: The RZW02.1-200-025 operates at a 25% duty cycle, which allows it to handle intermittent braking applications without overheating or failure.
