RZW02.1-132-025
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The RZW02.1-132-025 braking resistor offers a power class of 132 kW, a peak power of 119 kW, and a thermal time constant of 100 seconds. As part of the RZW Braking Resistors series by Bosch Rexroth Indramat, it is rated for IP20 protection and functions optimally in ambient temperatures from 0 °C to 40 °C.
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Product Description:
Bosch Rexroth Indramat manufactured the RZW02.1-132-025. In continuous regenerative braking situations, the Bosch Rexroth Indramat RZW02.1-132-025 brake resistor is designed to handle 132 kW continuous power. In servo-driven automation systems where regenerative power returns to the drive during motor deceleration, this is crucial. If not controlled, this energy can raise the DC bus voltage and cause overvoltage situations and drive failure. Because of its 132 kW continuous rating, the resistor can absorb this energy and release it as heat, keeping the system electrically balanced. The power rating is not just a theoretical value; it’s a limit determined by the resistor’s surface area, material and cooling design.
The RZW02.1-132-025 has a peak power dissipation of 119 kW in addition to its continuous rating. For short-term overloads that occur from emergency stops, quick deceleration cycles or load irregularities, this rating is important. As long as the overload duration is within acceptable limits, the resistor can release energy far above its continuous rating during these short periods without thermal fatigue. The internal resistor components’ heat capacity and thermal resistance must be enough to prevent thermal runaway or dielectric breakdown. By acting as a buffer to protect sensitive power electronics from energy surges, the 119 kW peak ensures the braking system stays stable even in case of unexpected load changes. This margin is crucial for uptime and drives integrity in applications with high inertia systems or aggressive motion profiles.
The RZW02.1-132-025’s thermal time constant is 100 seconds. This shows how long it takes to reach 63% of the total temperature change after a step change in power input. A 100-second time constant is balanced; it’s not too slow to impede cooling cycles between operations but is sufficient to stop fast temperature rise under short-duration overloads. This constant affects cooling needs and thermal cycling behavior from a system design perspective. It shows the interaction between the thermal mass of the resistor and its ability to transfer heat to cooling structures or the surrounding air. When calculating duty cycles or adding external cooling, engineers need to consider this number as a mistake that will result in thermal saturation over many braking cycles, which will degrade performance and component life over time.
Frequently Asked Questions about RZW02.1-132-025:
Q: What is the power class of the RZW02.1-132-025 braking resistor?
A: The RZW02.1-132-025 braking resistor has a power class of 132 kW, designed to handle high energy dissipation in industrial automation systems. This power rating allows it to effectively manage excess regenerative energy in systems with high power demands.
Q: What is the peak power of the RZW02.1-132-025 braking resistor?
A: The RZW02.1-132-025 braking resistor can handle a peak power of 119 kW. This peak power is crucial for handling short-term overloads in applications where high bursts of energy are generated, ensuring efficient energy dissipation during these events.
Q: What is the thermal time constant of the RZW02.1-132-025 braking resistor?
A: The thermal time constant of the RZW02.1-132-025 braking resistor is 100 seconds. This indicates the amount of time it takes for the resistor to heat up or cool down, ensuring it can handle temporary overloads without excessive thermal stress.
Q: What protection class does the RZW02.1-132-025 braking resistor have?
A: The RZW02.1-132-025 braking resistor has an IP20 protection class. This means it is protected against solid objects larger than 12 mm but is not protected from water, making it suitable for dry, controlled industrial environments.
Q: What is the temperature range for the RZW02.1-132-025 braking resistor?
A: The RZW02.1-132-025 braking resistor operates within an ambient temperature range of 0 °C to 40 °C. This flexibility allows it to be used in various industrial settings with moderate temperature conditions.
