KDA 2.1-050-3-APD-U1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat KDA 2.1-050-3-APD-U1 is a spindle drive from the KDA Spindle Drives series. It has a rated current of 50 Amps and operates on a DC supply voltage of 300 Volts. The unit uses forced cooling with a mounted heatsink blower, and the AC source for the blower is 115V at 50-60Hz.
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Product Description:
The KDA 2.1-050-3-APD-U1 is a cabinet-mounted spindle drive from Bosch Rexroth Indramat in the KDA Spindle Drives series. In a CNC cabinet, it connects to a common DC bus and modulates three-phase power for high-speed milling, drilling, or grinding spindles. By receiving velocity references from the numerical controller and returning spindle feedback, the unit keeps speed error low during rapid load changes. This type of drive is intended for machine tools that need stable spindle performance during cutting, acceleration, and deceleration. Its design supports integration with Indramat supply modules and uses an integral heat sink and blower assembly to remove generated heat.
The power section operates from a 300 VDC bus, and the inverter can deliver a continuous output current of 50 A to the spindle windings. The internal control electronics and IGBTs are cooled by a heat sink that is flushed with air from a dedicated blower powered by 115 V, 50/60 Hz. Air moves across the fins through forced cooling, which helps prevent thermal derating as cabinet temperature rises. With this arrangement, the drive converts the DC link voltage into a controlled three-phase waveform while staying within its current limits. The regulated output supports spindle operation over a wide speed range and responds quickly to changing load conditions during machining.
The unit operates in ambient temperatures from 5 to 45 °C and at altitudes up to 1000 m above sea level without current derating. It accepts a digital position command value when coordinated spindle positioning is required, and a second encoder socket is provided for spindle feedback or additional motor feedback. A separate analog speed reference input remains available for conventional speed control. The combination of analog and digital command channels allows the drive to serve standard speed-controlled spindles as well as applications that require orientation, synchronous tapping, or C-axis operation. These connections give the control system flexible ways to manage spindle speed and position from the same drive platform.
Frequently Asked Questions about KDA 2.1-050-3-APD-U1:
Q: What type of cooling system is utilized in the KDA 2.1-050-3-APD-U1 spindle drive?
A: The KDA 2.1-050-3-APD-U1 spindle drive uses a forced cooling system with a mounted heatsink blower.
Q: What is the rated current of the KDA 2.1-050-3-APD-U1 spindle drive?
A: This spindle drive operates with a rated current of 50 A for demanding spindle applications.
Q: What is the ambient temperature range for the KDA 2.1-050-3-APD-U1 spindle drive?
A: The permissible ambient temperature range for this model is 5 to 45 degrees Celsius, allowing use in moderate industrial environments.
Q: What DC supply voltage is required for the KDA 2.1-050-3-APD-U1?
A: The KDA 2.1-050-3-APD-U1 is supplied with 300 VDC input voltage for DC operation.
Q: What is the function of the second encoder input on the KDA 2.1-050-3-APD-U1?
A: This spindle drive features a second encoder input, suitable for either spindle feedback or additional motor feedback.
