SIEMENS 1FK7022-5AK71-1LG0 Replacement for SIMOTICS S-1FK7

Product Overview

SIEMENS 1FK7022-5AK71-1LG0 Replacement for SIMOTICS S-1FK7: Smooth Transition & Legacy System Compatibility

The SIEMENS 1FK7022-5AK71-1LG0 is a compact synchronous servo motor from the SIMOTICS S-1FK7 series, engineered for high-dynamic motion control applications across CNC machining centers, packaging lines, printing presses, and general industrial automation systems. As legacy servo systems age and original equipment manufacturers discontinue older drive-motor combinations, plant engineers and maintenance teams face increasing pressure to source reliable, drop-in replacement units that preserve existing wiring infrastructure, encoder feedback loops, and SINAMICS drive compatibility without triggering a full-system overhaul.

This product page is dedicated to supporting engineers and procurement teams planning a controlled migration from discontinued or end-of-life servo motor configurations to the 1FK7022-5AK71-1LG0 — with full attention to mechanical fit, electrical compatibility, and commissioning continuity.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from an aging servo system to the 1FK7022-5AK71-1LG0 rarely involves the motor alone. In practice, the upgrade path typically begins at the SINAMICS S120 drive module level. Engineers replacing older MASTERDRIVES MC or early SINAMICS CU310 control units will find that pairing this motor with a current SINAMICS S120 Booksize Motor Module — such as the 6SL3120-1TE13-0AA3 — provides a fully matched drive-motor combination with native DRIVE-CLiQ topology, eliminating the need for separate encoder evaluation boards.

For systems where the existing control cabinet uses a SIMATIC S7-300 or S7-400 PLC communicating over PROFIBUS DP, the transition to DRIVE-CLiQ-based servo feedback may require updating the drive’s telegram configuration via STARTER or TIA Portal. In many retrofit projects, the SINAMICS S120 CU320-2 PN control unit serves as the central axis controller, coordinating multiple servo axes — including the 1FK7022-5AK71-1LG0 — over PROFINET IRT, replacing legacy PROFIBUS wiring without changing the PLC program structure significantly.

On the power supply side, the SINAMICS S120 Active Line Module (ALM) or Smart Line Module (SLM) must be verified for compatibility with the total connected motor load. For compact single-axis applications, the SINAMICS S210 servo drive system offers a simplified alternative, as it is factory-matched to 1FK7 compact motors and supports one-cable connection (OCC) — combining power and DRIVE-CLiQ feedback in a single cable run, dramatically reducing cabinet wiring complexity during retrofit.

Terminal modules such as the SINAMICS TM31 or TM41 are commonly added during migration to handle analog I/O, digital I/O expansion, and HTL/TTL encoder re-routing from legacy sensors that remain in the machine. Where signal isolation is required between the new servo system and existing field devices, DIN-rail-mounted signal isolators or the SITOP PSU100S power supply modules are frequently specified alongside the motor replacement to ensure clean 24 VDC logic supply to the new drive components.

For machines retaining an existing SIMATIC HMI — such as the TP700 Comfort or KTP900 Basic — no panel replacement is typically required. The HMI communicates with the S7 PLC over PROFINET, and the servo axis data is passed transparently through the drive’s telegram interface. This preserves the operator interface investment while modernizing the motion layer.

In multi-axis gantry or coordinated motion applications, the 1FK7022-5AK71-1LG0 is often deployed alongside larger 1FK7 frame-size motors — such as the 1FK7032 or 1FK7044 — on a shared SINAMICS S120 drive line-up, all connected via DRIVE-CLiQ daisy-chain topology. This architecture simplifies commissioning in TIA Portal’s Motion Control wizard and supports isochronous PROFINET for tight axis synchronization.

Retrofit Guidance FAQ

Q: Can I replace my existing 1FK7 resolver-based motor with the 1FK7022-5AK71-1LG0 without changing the drive?
A: The 1FK7022-5AK71-1LG0 uses a DRIVE-CLiQ absolute encoder, not a resolver. If your existing SINAMICS drive module supports DRIVE-CLiQ (e.g., S120 Motor Module with DRIVE-CLiQ port), the replacement is straightforward. If your drive only supports resolver input, you will need to either upgrade the drive module or use a SINAMICS SMC10/SMC20 Sensor Module Cabinet-Mounted to convert the DRIVE-CLiQ signal — consult your drive’s hardware configuration manual.

Q: Is the mechanical mounting interface identical to my current 1FK7 compact motor?
A: Yes. The 1FK7022 compact frame uses a standard 40 mm flange (IM B5/IM V1) with a consistent bolt-circle pattern across the 1FK7 compact series. The shaft diameter and keyway dimensions (1LG0 suffix) are standardized, so existing couplings and gearbox interfaces are retained without machining.

Q: What changes are needed in the PLC program when replacing the servo motor?
A: Motor replacement alone does not require PLC program changes. The drive’s motor data set (MDS) must be updated in STARTER or TIA Portal to reflect the new motor’s electronic nameplate data, which is read automatically via DRIVE-CLiQ on first power-up. Axis scaling, speed limits, and torque limits should be verified against the new motor’s rated values before resuming production.

Q: How does the connector orientation affect cabinet wiring during replacement?
A: The 1LG0 connector suffix indicates axial power and signal connectors. If your existing motor uses a radial connector variant, the cable routing inside the cabinet or cable duct may need minor adjustment. Pre-terminated SIEMENS servo motor cables (e.g., 6FX series power and signal cables) are available in standard lengths and can be ordered to match the new connector orientation.

Q: Can this motor be used on a SINAMICS S210 single-axis drive?
A: Yes. The SINAMICS S210 is factory-optimized for 1FK7 compact motors and supports one-cable connection (OCC), which combines power and DRIVE-CLiQ in a single cable. This is the recommended upgrade path for standalone single-axis applications where cabinet space and wiring simplicity are priorities.

Q: What is the lead time and how is the motor tested before shipment?
A: Units in stock are dispatched within 1–3 business days from our Xiamen warehouse. Each unit undergoes pre-shipment inspection including insulation resistance testing, encoder communication verification, and visual inspection of connectors and shaft. A test report is available upon request.

Warranty Assurance

Every SIEMENS 1FK7022-5AK71-1LG0 unit supplied by TOPNLMS is backed by a 12-month warranty from the date of shipment. This warranty covers manufacturing defects, encoder communication failures, and premature bearing failure under normal operating conditions. It does not cover damage resulting from incorrect installation, overvoltage events, or mechanical overload beyond the motor’s rated torque envelope.

Pre-shipment testing: All units are inspected and tested prior to dispatch. Insulation resistance (IR) testing, DRIVE-CLiQ encoder readout verification, and physical connector integrity checks are performed as standard. A test record is available upon request for quality-assurance documentation purposes.

Replacement support: In the event of a warranty claim, TOPNLMS will arrange priority replacement shipment to minimize production downtime. Our technical team is available to assist with fault diagnosis, drive configuration verification, and commissioning support remotely via email or video call.

Procurement assurance: We maintain bonded stock of high-demand 1FK7 series motors to support urgent replacement requirements. Orders placed before 14:00 CST on business days are processed for same-day dispatch. Export documentation, CE declarations, and country-of-origin certificates (Germany) are provided with each shipment.

For procurement inquiries, technical compatibility questions, or urgent replacement requests, contact our industrial automation team directly.

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