Product Description:

The KDA 3.1-050-3-DQS-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. In a machining center or grinding cell, it functions as the closed-loop power stage that converts the shared DC bus into three-phase spindle power while executing speed commands from the numerical controller. By integrating current regulation, fault monitoring, and thermal supervision, the drive maintains accurate spindle velocity and torque during cut, dress, or rapid-position moves.

The power section is rated for an output of 50 A, allowing it to energize medium-frame induction or synchronous spindles without derating under continuous load. A DC bus requirement of 300 VDC ties the unit directly to Indramat supply modules, simplifying cabinet wiring. Heat sink airflow is provided by an integral blower that runs from 115 V / 50-60 Hz, so the cooling fan can be protected by standard control transformers. Thermal management relies on forced cooling through a mounted heatsink blower; this arrangement removes losses from the IGBTs and current sensors and keeps internal temperatures within safe limits at all spindle speeds. Speed reference data arrives as a 16 bit parallel word, giving the numerical control 65,536 discrete velocity steps for precise surface-feet-per-minute or constant-surface-speed functions.

Operation is specified between 5 to 45 °C, so the unit can sit in a typical plant enclosure without additional HVAC. Installation elevations up to 1000 m impose no power reduction, allowing the same cabinet design in most facilities. For diagnostics and parameter uploads, the front panel exposes an RS-232-C port that links the spindle drive to supervisory controllers, enabling parameter transfer and real-time trace capture without removing the unit from service.