RZW02.1-200-015

Product Description:

Bosch Rexroth Indramat manufactured the RZW02.1-200-015. The RZW02.1-200-015 brake resistor has a continuous power dissipation of 200 kW and is designed for high-energy applications in harsh industrial environments. The resistor’s ability to convert significant electrical energy, usually generated during motor deceleration, into thermal energy without exceeding its thermal limits is closely tied to this power class. Technically speaking, this is the resistor’s function in regulating the regeneration energy flow by maintaining voltage stability on the DC bus during braking. In high inertia systems where the kinetic energy of moving parts needs to be dissipated to avoid drive overvoltage and system shutdown this is crucial. Because of its high power rating, the resistor can be used in applications that require continuous high-frequency braking, such as big conveyor systems, hoists or CNC equipment with sudden motion reversals. The RZW02.1-200-015’s maximum switching power of 180 kW, which is the peak load it can handle during high-intensity braking pulses, complements its power rating.

The 1.8-ohm resistance value, which is the key to how the electrical energy from the motor is converted into heat, is at the heart of its electrical activity. The resistance controls the current flow for a given brake voltage and, therefore, the deceleration torque on the motor shaft. Lower resistance allows for higher current which increases the braking torque but also increases thermal stress. The selected 1.8 Ω value balances rapid braking and safe current levels throughout the system’s switching devices. For controlled load deceleration this is crucial, especially in multi-axis systems where coordinated braking is required to keep motors in sync. The RZW02.1-200-015 is physically made of galvanized steel housing and has a parallel wiring arrangement that can distribute 200 kW among internal resistive paths. This design increases overall cooling efficiency by reducing point source heating and increasing thermal conductivity.

Two 70 mm² conductors are part of the electrical connections, which reduce resistive losses and provide continuous current flow even under heavy load. For fault current control, a 10 mm² ground conductor is required, which ensures system safety by providing a low-impedance connection to the ground. To maintain insulation integrity and heat dissipation, the unit must be operated in dust-free, noncorrosive environments with ambient temperatures between 0 and 40°C and relative humidity below 90% (non-condensing). The unit’s ability to operate safely under varying load conditions is further supported by other thermal design components such as 35°C temperature rise and 100-second thermal time constant.