KDA 2.1-150-3-LQI-U1 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Bosch Rexroth Indramat KDA 2.1-150-3-LQI-U1 is a spindle drive from the KDA Spindle Drives series, featuring a rated current of 150 Amps and a DC supply voltage of 300 VDC. It uses forced cooling with a mounted heatsink blower powered by a 115V AC source, and supports SERCOS interface speed commands. The drive operates in ambient temperatures from 5 to 45 degrees Celsius and can be installed up to 1000 meters above sea level.
Internal Product Review
The KDA 2.1-150-3-LQI-U1 spindle drive from Bosch Rexroth Indramat delivers excellent performance with a rated current of 150 A and a DC supply voltage of 300 VDC. Forced cooling is achieved through a mounted heatsink blower powered by a 115V/50-60Hz AC source, supporting continuous operation even in demanding environments. The inclusion of an incremental encoder output and SERCOS interface for speed command makes this unit a solid choice for precise spindle control.
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Product Description:
The KDA 2.1-150-3-LQI-U1 is a spindle drive module manufactured by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series in hardware release 2. It takes DC-link energy from a compatible Indramat supply unit and converts it into three-phase variable voltage and frequency for machine tool spindles. This lets the drive regulate spindle speed accurately during cutting, drilling, and grinding processes that depend on stable rotational control. By regulating output voltage and frequency together, the module supports stable spindle behavior as machining loads change. The module also fits into a modular drive system that shares bus power and diagnostic functions with related supply and controller cards.
The drive delivers a continuous output of 150 A, allowing it to operate large induction or synchronous spindles without an external booster stage. Its intermediate circuit operates at 300 VDC, so the power section requires a matching regeneration supply on the DC bus. Thermal management relies on a mounted heat sink blower, and the integral fan is powered by 115 V/50-60 Hz from a separate auxiliary source. The pressurized airflow path helps remove heat from the power components mounted on the heat sink. Because the module uses forced cooling, it can maintain rated current during extended duty when cabinet airflow and installation clearances are suitable.
The electronics are intended for operation from 5 to 45 °C, so additional cabinet ventilation is generally only needed when ambient conditions rise above that range. Installation is permitted up to 1000 m above sea level without derating, which supports use in most industrial locations. Spindle velocity references enter the unit through the SERCOS interface, allowing synchronized communication with compatible motion controllers in the drive system. The module also provides an incremental encoder output, which forwards the spindle’s actual position as TTL pulses for equipment that needs downstream speed or position feedback.
