SIEMENS 1FK7042-5AK71-1EH0 SIMOTICS S synchronous servo motor

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The SIEMENS SIMOTICS S 1FK7042-5AK71-1EH0 is a compact AC synchronous servo motor from the 1FK7 series designed for high-precision CNC axis control and industrial automation applications. It is commonly used on machining centers, lathes, gantry systems, and automated production equipment where accurate positioning, smooth contouring, and dynamic response are essential.

This permanent-magnet servo motor delivers 3.0 Nm of rated torque, a maximum speed of 6000 rpm, and a rated output of 1.02 kW. When combined with a SIEMENS SINAMICS S120 drive and SINUMERIK control system, it provides precise motion control for X, Y, Z, and auxiliary axes while ensuring stable performance at both low and high speeds.

The motor features an integrated EnDat absolute encoder with 2048 pulses per revolution, allowing accurate position feedback and repeatable axis movement. A built-in holding brake enhances safety and positioning reliability, particularly on vertical axes and applications requiring secure stopping. The motor uses a plain shaft design and standardized SIEMENS power and feedback connectors, simplifying installation and replacement.

Designed for industrial environments, the 1FK7042-5AK71-1EH0 incorporates an IP64 protection rating and a robust housing suitable for operation in the presence of coolant mist and fine particles. The power and signal connector can be rotated by 270°, providing greater flexibility during installation in confined machine spaces.

This model is frequently selected as a direct replacement for motors suffering from encoder failures, reduced torque output, bearing wear, or general performance degradation. When the complete reference matches the original motor, replacement can typically be performed without modifications to the mechanical mounting, cabling, or drive configuration.

Widely used in maintenance, retrofit, and repair projects, the SIEMENS 1FK7042-5AK71-1EH0 helps reduce machine downtime and extend the service life of existing motion control systems. It is often kept in spare-part inventory to support rapid intervention and ensure continued productivity in industrial manufacturing environments.

Frequently asked questions about 1FK7042-5AK71-1EH0:

Which SIEMENS drive platform is this motor commonly paired with?
The 1FK7 series is commonly used with SINAMICS S120. Verify the control unit and feedback option on your drive match the motor’s encoder type for proper commissioning.

How do I confirm the encoder option for my replacement?
Check the full option code on the motor nameplate and compare it with your installed unit. Sharing a clear photo of the nameplate helps confirm feedback type and cable compatibility.

Are power and encoder cables included?
Cables are usually supplied separately. We can provide matching SIEMENS cable sets for the 1FK7 family to suit your drive interface and machine layout.

Can this unit replace other 1FK7042 variants?
It may replace another 1FK7042 model if the mechanical execution, rated data and feedback option are identical. Compare the complete order code and consult your drive parameters before the swap.

What should maintenance teams check during replacement?
Confirm the order code, feedback type and connector orientation, then verify rated data against the drive’s motor file. Keep original parameters backed up and follow your plant’s commissioning procedure.