KDA 3.3-050-3-LQD-U1
KDA Spindle Drives
Rated 4.9 stars (10 total reviews)
The Bosch Rexroth Indramat KDA 3.3-050-3-LQD-U1 spindle drive belongs to the KDA Spindle Drives series. Serving as the interface between the machine-tool controller and the motor, it converts the common DC bus energy into three-phase output and manages spindle acceleration and braking throughout milling or turning cycles. It communicates with upstream controllers through real-time links and executes current control loops that keep motor flux stable even when load demand shifts quickly.
Generation 3 hardware inside the module links to a shared supply rail at 300 VDC, and its power stage can deliver up to 50 A of continuous armature current to the spindle motor. Thermal losses are removed by a mounted heatsink blower that operates from a 115 V/50–60 Hz auxiliary line, while internal air passages support forced cooling to maintain semiconductor junction limits during extended high-speed cutting. Motion commands reach the drive over a SERCOS interface that transmits cyclic velocity data, and a separate channel accepts a digital position command value for fine axis synchronization with CNC controllers.
The unit operates reliably in ambient temperatures from 5 to 45 °C, so no derating is required in climate-controlled cabinets. Installation is permitted up to 1000 m above sea level without performance adjustment, matching typical factory elevations. These environmental allowances, combined with the serviceable blower and standardized fieldbus wiring, enable Bosch Rexroth Indramat users to integrate the drive into modular machine platforms without additional thermal or altitude considerations. Routine diagnostics on blower speed, DC bus level, and command channels can be accessed through service software, facilitating predictive maintenance scheduling.
Technical Specifications
AC Source for Heatsink Blower
115V/50-60Hz
AC Supply Source for Heatsink Blower
115 VAC
Additional Interfaces
Position command value, digital
Ambient Temp Range
5 to 45 Degrees Celsius
Aux. Encoder Input
With Aux. Encoder Input for 1V Sinusoidal Enc.
Aux. Interface
Position Command Value Digital 16-Bit Parallel
Cooling
Mounted Heatsink Blower
Cooling Mode
Forced Cooling
DC Bus Voltage
300 V
DC Supply Voltage
300 VDC
Design
3
Max Installation Elevation
1000M above sea level
Product
KDA
Product Type
Spindle Drive
Rated Current
50 A
Series
3
Speed Command Value
SERCOS Interface
Common Misspellings
Fax: 1-919-867-6204
Shipping & Payment Options
Warranty
Indramat USA 1 Year Warranty
Repair
We offer a repair service for the KDA 3.3-050-3-LQD-U1. Exchange
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