KDA 3.1-150-3-AQS-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 3.1-150-3-AQS-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 Volts. It comes equipped with a mounted heatsink blower for forced cooling and operates in ambient temperatures from 5 to 45 degrees Celsius. This drive includes a serial interface (RS 232 C) and supports analogue speed command values.
Internal Product Review
The KDA 3.1-150-3-AQS-U1 spindle drive from Bosch Rexroth Indramat delivers excellent performance with a 150 A rated current and 300 VDC supply voltage. Forced cooling via a mounted heatsink blower ensures stable operation within a 5 to 45 degrees Celsius ambient temperature range. The integrated serial interface (RS 232 C) adds flexibility for system integration, making this spindle drive a reliable choice for demanding applications.
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Product Description:
Bosch Rexroth Indramat manufactures the KDA 3.1-150-3-AQS-U1 as part of the KDA Spindle Drives series. The drive serves as a power amplifier that links a DC bus to high-speed spindle motors in CNC machining centers, turning equipment, and grinding cells. It interprets an analog speed reference from the controller and produces a regulated three-phase output so that the spindle can track programmed surface-feet-per-minute demands, sustain torque during heavy cuts, and decelerate quickly between tool changes.
The power section handles a continuous output of 150 A, matching medium-to-large spindle frame sizes that demand high stall torque during roughing passes. Its control electronics draw energy from a DC link stabilized at 300 VDC, and this voltage is shared across the drive rack. Thermal management relies on a mounted heat sink blower that sits directly on the aluminum extrusion of the drive. The blower is energized by a dedicated 115 V at 50/60 Hz single-phase feed, allowing consistent airflow regardless of spindle loading. Air is forced through the fin stack in a forced cooling configuration, which removes converter losses and keeps internal IGBT junction temperatures within safe margins during prolonged high-current operation.
Parameter access and diagnostic data are exchanged through a serial interface (RS-232-C), so settings can be adjusted without opening the cabinet. The drive reads the velocity setpoint as an analog ±10 V signal, making it compatible with many legacy and modern CNC controllers that use voltage reference loops. Reliable operation is specified between 5 to 45 °C, permitting installation in most production floor environments without dedicated climate control. At elevations up to 1000 m above sea level, the forced-air path still delivers adequate cooling, so the unit can operate in standard indoor plant locations.
