KDA 3.3-100-3-A0D-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 3.3-100-3-A0D-W1 is a spindle drive in the KDA Spindle Drives series and features a rated current of 100 Amps with a DC supply voltage of 300 Volts. It utilizes a mounted heatsink blower for forced cooling and supports both digital position command values and analog speed command values. The drive operates in ambient temperatures from 5 to 45 degrees Celsius and can be installed at elevations up to 1000 meters above sea level.
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Product Description:
The KDA 3.3-100-3-A0D-W1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. It is an electronically commutated spindle drive used to regulate high-speed machine-tool spindles in automated production cells. By converting shared DC-bus power into three-phase output for a synchronous or asynchronous motor, the unit supplies torque, monitors speed, and provides interface signals for closed-loop axis control within a multi-drive system. This allows the spindle to respond quickly to programmed changes in cutting speed as load conditions vary during machining. The drive is intended for installations where precise spindle behavior must be maintained during milling, drilling, and similar processes.
This drive operates from a common bus at 300 VDC and can deliver a continuous armature current of 100 A. An integral blower, supplied from an auxiliary source rated at 220 V/50–60 Hz, pushes air through the external heat sink to remove switching losses from the power section. A heat sink-mounted blower with forced cooling helps maintain semiconductor junction temperatures during sustained full-load duty and repeated speed changes. Internally, a thyristor bridge and current regulators shape the spindle waveform while the Series 3 control board monitors encoder feedback for stable control response. The unit supports a primary encoder connection, but it does not include a second encoder input.
The thermal operating range is 5 to 45 °C, and installation is permitted at elevations up to 1000 m without derating. Speed reference data enter the control loop as an analog command, while fine positioning is handled through a separate digital position command interface for dual-channel control. This separation lets the drive manage spindle speed and positioning-related commands without relying on a single input path. The lack of a secondary encoder socket keeps panel wiring simpler and avoids unused connections in systems that only require one feedback channel. This layout fits machining applications that combine continuous spindle rotation with controlled positioning functions.
