SIEMENS 1FT5046-1AK71-3AB0 Servomotor Tacho Brake

Buy online your SIEMENS 1FT5046-1AK71-3AB0 Servomotor Tacho Brake reference 1FT5046-1AK71-3AB0 from our e-store Cnc-shopping, specialist in CNC machine-tools spare parts.

This SIEMENS unit from the 1FT5 family is an AC servo used for CNC axis motion with integrated feedback and a holding brake. It serves as a replacement motor and spare part for legacy SIEMENS axis packages that rely on tacho velocity feedback, supporting fast field replacement and reliable positioning on machine tools.

The motor uses a 1FU1030 tacho generator for speed feedback, a common requirement on earlier SIEMENS drive systems. With a maximum speed of 6000 rpm, it covers a wide operating window for feed axes in milling and turning machines. The spring-applied brake holds the axis when power is removed, which is important on vertical axes or safety-critical stops.

Mechanical interface is straightforward for maintenance teams. The keyed 15 mm straight shaft and 80 mm centering flange allow direct coupling to gearboxes, pulleys or rigid couplings already installed on the machine. Matching the exact reference 1FT5046-1AK71-3AB0 ensures drop-in fit on machines originally supplied with this model, also searched as 1FT50461AK713AB0 or 1FT5046 1AK71 3AB0.

Commonly found on legacy SIEMENS axis packages using analog speed feedback, this AC servomotor is suited for CNC milling, turning and handling stages where consistent low-speed control, stable holding torque and predictable feedback are required.

Reference: 1FT5046-1AK71-3AB0

Manufacturer: SIEMENS

Product type: SIEMENS Servo motor 1FT5

Main function: AC servo for CNC axis motion with integrated tacho feedback and holding brake

Applications: Feed axes on CNC mills and lathes, vertical axes requiring brake hold, retrofit and maintenance replacements on older SIEMENS systems using tacho velocity loops

Key technical data: 1FT5 AC servomotor with keyed 15 mm shaft and 80 mm centering diameter, up to 6000 rpm, integrated holding brake, 1FU1030 tacho generator around 6.7 mV per rpm signal constant, refurbished and function tested, manufactured in Germany, availability typically 5 to 8 days.

In service, this model is used to restore axis motion on machines that shipped with the 1FT5 platform. Maintenance teams select this exact reference when a defective motor causes following errors, unstable speed regulation or brake faults. Keeping a stocked replacement unit in the toolroom helps shorten machine downtime during planned overhauls and unplanned failures.

For field replacements, the matching shaft geometry and flange centering simplify mechanical fit. Using the same tacho constant from the 1FU1030 feedback eases commissioning on the existing drive configuration, which helps return the machine to production with minimal parameter adjustments.

Each refurbished unit is inspected and tested by skilled engineers on CNC simulators with servo motors, including tacho signal verification, brake function checks and dynamic run tests. Units are packed for industrial transport with rotor locking and connector protection. A warranty is supplied with the motor, and dispatch is arranged according to availability.

This model is often requested as an emergency spare for legacy equipment. Cnc-shopping can assist with repair service or an exchange service when possible, helping keep older CNC installations operational and reducing the risk of extended downtime caused by obsolete parts.

Frequently asked questions about 1FT5046-1AK71-3AB0:

What feedback does this motor use?
It is equipped with a 1FU1030 tacho generator, commonly used on older SIEMENS axis loops. The tacho provides an analog speed signal around 6.7 mV per rpm for the drive controller.

Does it include a holding brake and where is it typically used?
Yes, it has an integrated holding brake suitable for vertical axes and applications where the load must remain in position at power off. This helps maintain safe axis hold during stops and service work.

What are the main mechanical fit points to verify?
Confirm the 15 mm keyed shaft and the 80 mm centering diameter match your coupling and flange. When the original reference is 1FT5046-1AK71-3AB0, the replacement is designed as a drop-in fit.

What lead time should we plan for?
Typical availability is 5 to 8 days. For urgent needs, contact us to check current inventory or discuss a refurbished unit from industrial spare inventory.

Is it suitable for retrofit projects on older SIEMENS drives?
It is commonly used on legacy systems that rely on analog tacho feedback. For a retrofit, verify your drive accepts tacho input and confirm the required tacho constant before installation.