Product Description:

The KDV 4.1-30-3-S1 is a supply module manufactured by Bosch Rexroth Indramat for the KDV Supply Modules series. It delivers a stabilized DC link for coordinated servo axes, converts three-phase mains into a regulated internal bus, and provides a 24 V auxiliary rail for drive logic and safety relays. By combining energy distribution and braking circuitry in one housing, the unit simplifies cabinet wiring and supports automation lines that require simultaneous control of multiple drives. In multi-axis systems, this arrangement helps keep bus power available during coordinated motion and controlled braking events.

The module maintains a link circuit at 320 V DC and can momentarily furnish up to 48 kW to connected inverters during acceleration. Transient events are limited by a maximum overvoltage threshold of 1490 V, which protects drive electronics against mains spikes or regenerative peaks. The unit has an assembly weight of 21 kg, which is relevant for panel mounting and vibration loading. Cabinet power loss is 150 W; when combined with 500 W of external loss and the 70 VA drawn by each heatsink fan, these values indicate the required enclosure cooling capacity. The 24 V logic rail supplies 11.5 A with 2% ripple, while a separate 100 mA HSM output supports measurement circuitry. Auxiliary devices can draw 500 VA without affecting drive performance.

During regenerative braking, the internal bleeder can dissipate up to 40 kW, which is also the short-term limit for power returned from the drives. Absorption capacity reaches 100 kWs, allowing repeated deceleration cycles before external braking resistors are needed. A maximum of 10 drive modules can share the common DC bus, allowing several axes to operate from one supply unit. This layout suits installations where multiple servo amplifiers accelerate and decelerate on a shared power source. Continuous bleeder power is 0 W, so no heat is generated by the bleeder during steady-state operation.