SIEMENS 1FK7022-5AK71-1LG0 Migration-Ready Servo Motor

Overview

SIEMENS 1FK7022-5AK71-1LG0 Migration-Ready Servo Motor for Legacy Control Systems

The SIEMENS 1FK7022-5AK71-1LG0 is a compact, high-precision permanent-magnet synchronous servo motor from the SIMOTICS S-1FK7 series, purpose-built for demanding motion control applications in legacy automation environments. As original SIMOTICS S-1FK7 units reach end-of-life or become increasingly difficult to source, the 1FK7022-5AK71-1LG0 serves as a verified migration-ready replacement that preserves existing mechanical interfaces, encoder feedback topology, and DRIVE-CLiQ communication architecture — minimizing engineering rework and commissioning time during retrofit projects.

Engineers undertaking control cabinet upgrades, production line modernization, or spare-part lifecycle extension will find this motor a reliable anchor in their migration bill of materials. Its compact frame (shaft height 20 mm), natural cooling design, and integrated DRIVE-CLiQ encoder interface allow direct substitution in most SINUMERIK- and SINAMICS-driven axes without structural modification to the machine bed or cable tray.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful 1FK7022-5AK71-1LG0 retrofit begins well before the motor arrives on site. The first step is a thorough audit of the existing drive topology. In most SINAMICS S120 booksize or chassis installations, the servo axis powered by the legacy 1FK7 motor shares a DC bus with other axes — meaning the Motor Module (e.g., a 6SL3120-series single-axis or double-axis module) must be verified for current rating compatibility with the replacement motor’s stall and peak current envelope. If the existing Motor Module is undersized or itself approaching end-of-life, a parallel replacement of the drive module should be planned to avoid a second unplanned outage.

Terminal wiring and cable assemblies deserve particular attention. The 1FK7022-5AK71-1LG0 uses a bayonet-style power connector and a DRIVE-CLiQ signal connector. If the existing installation uses an older 1FK7 variant with a separate resolver or sin/cos encoder cable (non-DRIVE-CLiQ), a cable adapter kit or full cable replacement will be required. This is a common oversight that extends commissioning time. Pre-ordering the correct MOTION-CONNECT 800PLUS power cable and DRIVE-CLiQ cable to match the existing cable tray routing length eliminates last-minute delays.

For machines running SINUMERIK 840D sl or 828D, the axis machine data (MD30130 through MD30350) must be reviewed and updated to reflect the new motor’s electrical parameters. The SINAMICS drive will auto-identify the 1FK7022-5AK71-1LG0 via DRIVE-CLiQ on first power-up, but the CNC axis parameters — including maximum speed, torque limits, and encoder resolution — must be cross-checked against the original motor data sheet to ensure the NC program’s dynamic limits remain valid. Failure to do so can trigger axis following-error faults or, in worst cases, mechanical overtravel.

In multi-axis gantry or coordinated motion applications, the SINAMICS Control Unit (CU320-2 DP or CU320-2 PN) topology file must be updated after the motor swap. The drive’s DRIVE-CLiQ topology is stored in the project file; replacing a motor without updating the topology can cause a drive fault on restart. Using TIA Portal V16 or later with the SINAMICS Startdrive add-in simplifies this process — the software will detect the new motor’s electronic nameplate and prompt the engineer to accept or reject the updated parameters.

Beyond the servo axis itself, engineers should also verify the condition of the associated Line Module (Active Line Module or Basic Line Module in the S120 system) and the 24 V DC SITOP power supply feeding the control electronics. Aging power supplies are a frequent cause of intermittent faults that are incorrectly attributed to the servo motor. Replacing the 1FK7022-5AK71-1LG0 while leaving a marginal SITOP PSU in service risks a repeat outage within months. Similarly, if the machine uses a SIMATIC S7-300 or S7-400 PLC for sequencing, confirm that the PLC’s PROFIBUS DP or PROFINET interface module is still within its rated operating life and that the drive’s telegram type (e.g., Telegram 105 for DSC) matches the PLC’s drive block configuration.

Finally, if the machine includes a SIMATIC HMI panel (TP700, TP900, or KTP series), verify that the axis status screens and alarm texts referencing the motor axis number remain valid after the swap. In some installations, the HMI project references motor-specific diagnostic variables that may need to be re-mapped if the drive slot assignment changes during the retrofit.

Downtime Control During System Migration

Minimizing production downtime during a 1FK7022-5AK71-1LG0 swap requires a structured pre-outage preparation protocol. Before the maintenance window opens, the engineering team should complete a full backup of the SINAMICS drive project (using STARTER or TIA Portal Startdrive), the SINUMERIK NC/PLC archive (using SINUMERIK Operate’s system data backup function), and the HMI project file. These backups should be stored on an external USB drive and verified for completeness — a corrupted backup discovered mid-outage is a critical risk multiplier.

During the outage, follow a strict sequence: de-energize the Motor Module, discharge the DC bus (confirm with a voltmeter — do not rely solely on the drive’s ready LED), disconnect the power and DRIVE-CLiQ cables, remove the motor from the machine, install the 1FK7022-5AK71-1LG0, reconnect cables, and restore power. On first power-up, the SINAMICS drive will perform a DRIVE-CLiQ enumeration. Accept the new motor’s electronic nameplate data, run the motor identification routine (rotating or standstill, depending on machine constraints), and verify the encoder offset. Only after successful motor identification should the NC axis be enabled and a slow-speed test traverse performed to confirm direction, limit switch response, and following-error behavior.

For facilities with strict change-management requirements, a pre-tested spare — a 1FK7022-5AK71-1LG0 that has been bench-tested against a SINAMICS S120 test rig and confirmed operational — dramatically reduces outage duration. KNMKS performs outgoing functional verification on all servo motors prior to shipment, providing a test report that documents no-load speed, encoder signal integrity, and insulation resistance. This pre-shipment test data supports the site acceptance test and provides documentary evidence for quality audits.

Where the machine cannot tolerate a full axis outage, consider a phased migration: run the legacy motor at reduced duty cycle while the replacement is prepared and pre-commissioned on a bench drive, then execute the physical swap during a scheduled micro-outage (typically 2–4 hours for a well-prepared team). This approach is particularly effective in continuous-process industries where even a planned 8-hour outage carries significant production cost.

Retrofit Support FAQ

Q1: Is the 1FK7022-5AK71-1LG0 a direct drop-in replacement for the 1FK7022-5AK71-1AA0?
In most cases, yes — both share the same frame size, flange dimensions, and DRIVE-CLiQ interface. The key difference is the shaft and holding brake option encoded in the order suffix. Verify the shaft diameter, key/keyless configuration, and brake voltage (24 V DC) against your existing motor before ordering. KNMKS can cross-reference your existing motor nameplate data to confirm compatibility.

Q2: What commissioning steps are required after installation?
After physical installation and cable connection, power up the SINAMICS drive and allow DRIVE-CLiQ auto-detection to complete. In TIA Portal Startdrive or STARTER, accept the new motor’s electronic nameplate, run the motor identification routine (p1910 = 1 for standstill identification or p1960 = 1 for rotating identification), and verify encoder offset (p0431). Then perform a slow-speed test traverse (±10% of rated speed) and confirm following error, torque limits, and limit switch response before returning the axis to production.

Q3: Does KNMKS provide outgoing test documentation?
Yes. Every 1FK7022-5AK71-1LG0 shipped by KNMKS undergoes functional verification prior to dispatch. The test report covers no-load speed accuracy, DRIVE-CLiQ encoder signal integrity, winding insulation resistance (≥ 100 MΩ at 500 V DC), and visual inspection of connectors and shaft. The test report is included with the shipment and available digitally on request.

Q4: What is the support terms coverage and what does it include?
KNMKS provides a support terms confirmed by quotation from the date of shipment. The support terms covers manufacturing defects, encoder failure, and winding faults under normal operating conditions. It does not cover damage resulting from incorrect installation, overvoltage, or operation outside the motor’s rated parameters. For support requests, contact admin@knmks.com with the shipment date, order number, and a description of the fault. Replacement or repair will be arranged within 5 business days of claim confirmation.

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SIEMENS
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1FK7022-5AK71-1LG0

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Servo Systems

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