RAC 3.5-100-460-LP0-W1-220 Bosch Rexroth Indramat
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MPN: R911262806
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The Bosch Rexroth Indramat RAC 3.5-100-460-LP0-W1-220 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It features a rated current of 100 Amps and supports a rated connection voltage of 3 x AC 400 V or 3 x AC 460 V. The controller uses an internal blower for cooling, has an additional encoder input for spindle feedback, and operates with a speed command via a SERCOS interface.
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Product Description:
The RAC 3.5-100-460-LP0-W1-220 is an AC main spindle drive controller produced by Bosch Rexroth Indramat and assigned to the RAC Spindle Drive Controllers series. Designed for machining centers and similar equipment, the controller regulates spindle motor speed and torque with closed-loop feedback so cutting, drilling, and grinding operations remain within commanded profiles. By combining power electronics, encoder processing, and fieldbus communication, the unit serves as the central drive element between a CNC control and the spindle it drives.
Power handling starts with a three-phase supply rated at 3 × AC 400 V ±15% or 3 × AC 460 V, allowing the device to operate from common plant mains. The inverter stage can deliver a continuous output of 100 A, which is the maximum steady-state current supplied to the spindle windings. Internal heat generated by switching components is removed through a built-in internal blower, eliminating the need for external cooling ducts. The control electronics are powered separately at AC 230 V / 50-60 Hz, which keeps logic power separate from the main bus. Velocity setpoints are received over the SERCOS interface, allowing deterministic command timing from the CNC.
Feedback and communication hardware are located on connector X4 with optical waveguides, which provides noise-immune links for real-time data exchange. High positional resolution is provided by a high-resolution Indramat encoder supported by an additional encoder input for spindle feedback; this second channel lets the drive compare motor position signals during high-speed cutting. Energy generated during deceleration is sent back to the DC bus because the unit is supplied without an additional bleeder, so an external braking resistor may be required in the machine. The controller is series 3 and version 5. This versioning identifies the product generation used for this drive type.
Frequently Asked Questions about RAC 3.5-100-460-LP0-W1-220:
Q: What is the rated current of the RAC 3.5-100-460-LP0-W1-220 spindle drive controller?
A: The RAC 3.5-100-460-LP0-W1-220 delivers a rated current of 100 A for spindle operation.
Q: What rated connection voltage is supported by the RAC 3.5-100-460-LP0-W1-220?
A: This controller accepts a rated connection voltage of 3 x AC 400 V at 50 Hz (±15%) or 3 x AC 460 V.
Q: How is the RAC 3.5-100-460-LP0-W1-220 cooled?
A: It is equipped with an internal blower and a built-in fan for cooling.
Q: What type of encoder does the RAC 3.5-100-460-LP0-W1-220 use for feedback?
A: The RAC 3.5-100-460-LP0-W1-220 uses a high-resolution INDRAMAT encoder for position feedback.
Q: Which interface is used for speed command input on the RAC 3.5-100-460-LP0-W1-220?
A: This model accepts speed commands through the SERCOS interface.
