RAC 2.3-250-460-DP0-W1 Bosch Rexroth Indramat
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MPN: R911268722
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The Bosch Rexroth Indramat RAC 2.3-250-460-DP0-W1 is an AC Main Spindle Drive Controller that is part of the RAC Spindle Drive Controllers series. It features a rated current of 250 Amps, operates at a connection voltage of 3 x AC 400 V, 50 Hz with a tolerance of plus or minus 15 percent, or 3 x AC 460 V, and uses internal blower cooling. The controller offers a digital speed command and provides a high-resolution Indramat encoder along with an additional encoder input for spindle feedback.
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Product Description:
The RAC 2.3-250-460-DP0-W1 spindle drive controller is produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. It is an AC main spindle drive controller that modulates high-current three-phase power into the voltage, frequency, and timing required by a machine-tool spindle. In industrial automation cells, it provides closed-loop speed and torque regulation so computerized numerical control systems can cut, drill, or mill with repeatable accuracy. This type of control helps the spindle maintain stable operation during rapid acceleration, load changes, and precise speed transitions.
The unit accepts a line supply of 3 × AC 400 V at 50 Hz and can also operate from 3 × AC 460 V sources, allowing installation in mixed-voltage plants. Inside the housing, a power section rated for 250 A supplies the high momentary currents that large spindle motors require during acceleration and contouring. Thermal control is maintained by an internal blower that directs airflow across the heat sink assembly, which helps keep power components within their operating range during sustained use. Command and diagnostic wiring terminate on the X4, 25-pole connector, and speed references arrive as a 16-bit parallel word that the controller converts directly into pulse-width-modulated output without serial latency. The parallel command path supports fast response to setpoint changes from the higher-level control.
The drive operates without an additional bleeder, so regenerated energy returns to the shared DC link or is buffered by internal capacitors. Precision spindle positioning is supported by an additional encoder input that works together with the standard high-resolution INDRAMAT encoder channel, improving phase detection during threading or rigid tapping cycles. This dual-feedback arrangement also supports accurate spindle orientation when the machine process requires a controlled angular position. The drive is Series 2, and the control board is Version 3. These revisions support compatibility with later diagnostic tools and operator terminals.
Frequently Asked Questions about RAC 2.3-250-460-DP0-W1:
Q: How is the RAC 2.3-250-460-DP0-W1 spindle drive controller cooled?
A: The RAC 2.3-250-460-DP0-W1 is equipped with an internal blower and built-in fan for cooling.
Q: What is the rated current capacity of the RAC 2.3-250-460-DP0-W1 controller?
A: This model supports a rated current of 250 A, allowing it to deliver high output for demanding spindle applications.
Q: What input voltage range does the RAC 2.3-250-460-DP0-W1 support?
A: The controller is compatible with 3-phase AC 400 V at 50 Hz (±15%) or 3-phase AC 460 V supply voltages.
Q: What type of encoder is used with this spindle drive controller?
A: The RAC 2.3-250-460-DP0-W1 features a high-resolution INDRAMAT encoder for precise spindle control.
Q: How does the RAC 2.3-250-460-DP0-W1 receive speed commands?
A: Speed commands are accepted via a digital 16-bit parallel interface for accurate control.
