Product Description:

The Bosch Rexroth Indramat RZW02.1-018-040 belongs to the RZW Braking Resistors series. Designed for regenerative drive systems, the unit converts excess kinetic energy into heat so servo or inverter outputs remain stable during rapid deceleration or direction changes. Integrating it with Rexroth power modules prevents DC bus overvoltage events that could otherwise trip the drive or damage connected equipment.

The resistor has a nominal dissipation capability of 18.5 kW, which describes the instantaneous power it can absorb from the DC link when the drive brakes a high-inertia axis. Its electrical resistance is fixed at 18.0 Ω; this value establishes the braking current that will flow at a given link voltage and affects the peak torque the motor can develop during stopping. Application limits are set by an operating factor of 40% SD, meaning the element may only be energized for a specified portion of each duty period. The unit operates with a 120 s load cycle, during which the permitted on-time and off-time are calculated. Stored heat leaves the aluminum housing according to a thermal time constant of 100 s, so temperature tracking in the controller should account for this delay when scheduling successive braking events.

Within the stated cycle, the device may conduct for up to 48 s before it must cool for 72 s; these limits prevent the surface from exceeding the maximum housing temperature of 80 °C. The enclosure has an IP20 rating, providing protection against finger contact but no protection against liquids, so installation inside a ventilated cabinet is required. A ground conductor with a cross-sectional area of at least 10 mm² must be bonded to the integrated terminal to route fault current away from adjacent modules. The mechanical form follows Design 1 in Line 2 of the platform, allowing the resistor to mount directly beside Rexroth drive stacks without extra brackets.