RZW03.1-005-015

Product Description:

Bosch Rexroth Indramat manufactured the RZW03.1-005-015. The RZW03.1-005-015 brake resistor is designed to handle excessive power dissipation in industrial drives during deceleration. The 5.5kW power class can convert a lot of kinetic energy into heat in a short time, controlled by heat transfer and energy conservation. When a heavy inertial load drops quickly, this high dissipation capacity is very important. The resistor maintains voltage and protects delicate electronics by absorbing this energy and preventing overvoltage on the DC bus of the drive system. To provide consistent thermal conversion efficiency without going beyond the system’s thermal design envelope, the 1.8ohm resistance value was chosen to balance braking torque and energy dissipation. The brake resistor is designed for a 15% duty cycle based on 120 seconds cycle time, so thermal control is a limiting factor. This means the resistor will not operate for more than 18 seconds at full load per cycle within its thermal capacity.

The 150-second thermal time constant, which is how fast the internal temperature of the resistor reacts to step changes in power dissipation, further regulates its ability to dissipate heat during intermittent operation. Its thermal mass, which is important for pulsed braking loads and allows it to absorb energy spikes without instantaneous thermal saturation, is reflected in this value. The resistor can provide high braking performance in various industrial drives without risk of degradation or failure from overheating if used within its thermal time limits. A continuous power dissipation of 1.6kW and a peak power of 5kW are additional operating parameters. The 48-second switch-on time and 72-second minimum off-time at 40% duty cycle are the basis for thermal cycling analysis and are important for thermal modeling during both transient and steady-state operation. These limits prevent overheating under varying loads and extend the life of the resistor.

Grounding specs and environmental tolerances add to the safety and reliability. To ensure any fault current is discharged to the ground with the least resistance, the grounding conductor must be at least 10mm² or equal to the size of the power conductor. This spec is important to prevent insulation failure during fault conditions and to meet electrical safety requirements. The resistor’s electrical and mechanical integrity can be maintained within the specified temperature and moisture limits of 0°C to +40°C for operation -25°C to +70°C for storage, and up to 90% non-condensing humidity. These specs allow the resistor to be used in various industrial applications without performance degradation due to environmental stress.