Product Description:

The BZM01.1-01-07 auxiliary bleeder module is built by Bosch Rexroth Indramat and belongs to the Auxiliary Bleeders series. Mounted on the shared DC bus of drive packs, it converts surplus regenerative current into heat through a resistive network, preventing overvoltage when servo axes decelerate or reverse. By shielding inverters and intermediate circuits from energy spikes, the unit increases uptime and keeps motion systems within a normal voltage window during demanding automation cycles. This function is useful on coordinated axes where several motors can feed energy back into the common bus at the same time.

The bleeder accepts a control line of DC 24 V ±20% between terminals X4/1 and X4/4, and this interface draws only 90 mA, so control supplies remain lightly loaded. Once the common link reaches its nominal level of 700 V, the internal resistors conduct continuously at 1 kW. For rapid stops, the assembly can momentarily rise to 40 kW of peak dissipation, allowing connected drives to dump braking energy without tripping. These electrical limits suit servo groups with aggressive acceleration profiles while respecting cabinet thermal constraints.

When braking energy returns from the motors, the module diverts that energy away from the DC link so stored bus voltage does not climb unchecked during repeated deceleration cycles. The unit is Design Version 1 and Series Version 1, which place it within the established format used for this module type. Its role is limited to bleeder operation, so it works as a supporting device beside drives and supply components rather than as a standalone controller. Because the resistor bank turns recovered energy into heat, enclosure airflow and component spacing remain important where braking events occur often. This arrangement helps multi-axis systems that share one DC bus handle regenerative events from several axes without interrupting normal motion.