Product Description:

The KDA 3.1-150-3-DYS-W1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it receives a fixed DC bus and modulates that power so a machine-tool spindle can accelerate, brake, and hold commanded speeds under closed-loop control. The unit fits into modular drive racks used in automated milling, drilling, or grinding equipment where precise spindle regulation is required. In this role, it supports stable speed control during cutting cycles and quick response to changing spindle loads.

The drive can deliver a continuous phase current of 150 A, giving it headroom for high-torque acceleration profiles on large-frame motors. Its DC bus input is specified at 300 VDC, which sets the power section operating level and must match the cabinet supply. Speed references are accepted through a 16-bit parallel digital input, allowing a controller to send exact RPM commands without analog conversion error. Parameter access and diagnostics are available over a serial interface (RS-232-C), which supports direct communication for setup and troubleshooting. Thermal energy from the power electronics is removed by a mounted heatsink blower, and the airflow works with the housing fins to maintain component temperatures within their intended operating range.

The heatsink fan is powered from an auxiliary source rated at 220 V / 50/60 Hz, so cabinet wiring must provide that single-phase feed independent of the DC link. The unit is intended for ambient temperatures from 5 to 45 °C, and operation outside that range can trigger temperature alarms even with forced cooling active. Installation altitude is capped at 1000 m above sea level to maintain adequate air density for heat removal and dielectric strength. For applications that need dual-channel feedback, the control board includes a second encoder input and synchronous input, enabling phase-locked spindle positioning when coordinated with a master axis.