KDA 3.1-150-3-AQS-U1 Bosch Rexroth Indramat
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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.
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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.
Frequently Asked Questions about KDA 3.1-150-3-AQS-U1:
Q: What cooling method is used for the KDA 3.1-150-3-AQS-U1 spindle drive?
A: This model uses forced cooling with a mounted heatsink blower for temperature management.
Q: What is the rated current of the KDA 3.1-150-3-AQS-U1 spindle drive?
A: The rated current of the KDA 3.1-150-3-AQS-U1 spindle drive is 150 A.
Q: What AC source does the heatsink blower require on the KDA 3.1-150-3-AQS-U1?
A: A 115V AC source at 50-60Hz is required for the heatsink blower on this model.
Q: What is the allowable ambient temperature range for the KDA 3.1-150-3-AQS-U1?
A: The KDA 3.1-150-3-AQS-U1 operates reliably within an ambient temperature range of 5 to 45°C.
Q: What type of additional interface is available on the KDA 3.1-150-3-AQS-U1?
A: This unit features a serial interface (RS 232 C) for additional connectivity.
