Siemens 1FK7022-5AK71-1LH0 Migration-Ready AC Servo Motor

Overview

Siemens 1FK7022-5AK71-1LH0 Migration-Ready AC Servo Motor for Legacy Control Systems

The Siemens 1FK7022-5AK71-1LH0 is a compact, high-precision AC servo motor from the SIMOTICS S-1FK7 series, purpose-built for demanding motion control applications in legacy automation environments. As industrial facilities accelerate their migration away from end-of-life SINAMICS and MASTERDRIVES platforms, the 1FK7022-5AK71-1LH0 provides a verified drop-in replacement path that preserves existing wiring infrastructure, minimizes re-engineering effort, and reduces unplanned downtime during critical production transitions.

This unit ships pre-tested, fully inspected, and backed by a support terms confirmed by quotation — making it the preferred choice for maintenance engineers, OEM integrators, and plant modernization teams operating under tight outage windows.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful integration of the 1FK7022-5AK71-1LH0 into a legacy control cabinet begins well before the motor arrives on-site. Engineers should first audit the existing SINAMICS S120 drive module — typically a Single Motor Module (SMM) or Double Motor Module (DMM) — to confirm that the DC link voltage, rated current output, and axis assignment match the 1FK7 nameplate data. Where the original axis was driven by an older SIMODRIVE 611 amplifier, a drive replacement to SINAMICS S120 Booksize or Chassis format is recommended in parallel with the motor swap to ensure full DRIVE-CLiQ communication integrity.

Terminal wiring should be verified against the existing motor cable. The 1FK7022-5AK71-1LH0 uses a standard Siemens power connector with U, V, W phase leads and a PE ground — compatible with Siemens MOTION-CONNECT 800PLUS servo cables already installed in most S-1FK7 applications. If the existing cable is longer than 25 m, check the cable capacitance specification against the drive’s output filter requirements to avoid nuisance overcurrent trips during acceleration ramps.

For systems using a SIMATIC S7-300 or S7-400 PLC as the motion controller, the axis object in STEP 7 or TIA Portal must be re-downloaded after the motor swap to refresh the encoder data set (EDS) stored in the DRIVE-CLiQ device. Failure to re-download the axis configuration is the most common cause of F07900 encoder faults after a motor replacement. Where the HMI (typically a SIMATIC TP or MP panel) displays axis position or speed, verify that the scaling factors in the WinCC Flexible or TIA Portal HMI project still match the new motor’s encoder resolution — the 1FK7022-5AK71-1LH0 uses a 20-bit absolute encoder by default.

Installations that include a SINAMICS S120 Control Unit (CU320-2 DP or CU320-2 PN) should confirm that the drive topology is saved and backed up via STARTER or Startdrive before the motor is disconnected. This protects the existing drive parameterization and allows rapid restoration if the commissioning process encounters unexpected faults. Where the system includes additional I/O modules such as a TM31 Terminal Module or TM41 for external encoder feedback, these should remain powered during the motor exchange to maintain the safety relay chain and avoid STO (Safe Torque Off) faults on adjacent axes.

Downtime Control During System Migration

Minimizing production interruption during a servo motor replacement requires a structured pre-outage checklist. Before the planned maintenance window, upload the full drive parameter set from the SINAMICS S120 using STARTER’s “Upload to PG” function and store it on a local engineering workstation. This backup covers all axis parameters, safety configurations, and communication settings — enabling a full drive restore in under 20 minutes if a fault occurs during recommissioning.

During the physical swap, label all motor cable connectors before disconnection and photograph the terminal block layout inside the control cabinet. The 1FK7022-5AK71-1LH0’s bayonet power connector and DRIVE-CLiQ port are keyed, reducing the risk of mis-wiring, but the brake connector (where fitted) must be verified for polarity before energizing. Once the motor is mechanically secured and cables reconnected, perform a DRIVE-CLiQ topology scan from the Control Unit before enabling the axis — this confirms that the new motor’s electronic nameplate has been read correctly and that no ghost devices remain from the previous motor.

For facilities running continuous processes, consider staging the motor replacement during a scheduled product changeover or shift break rather than a full plant shutdown. The 1FK7022-5AK71-1LH0’s compact frame size (SH28) and standard IEC flange allow a trained technician to complete the mechanical exchange in under 45 minutes, leaving the remaining outage window for electrical reconnection, parameter download, and a short jog-mode verification run before returning the axis to automatic mode.

All units supplied by KNMKS are pre-tested under load prior to shipment, with test records available on request. This eliminates the risk of receiving a DOA unit and allows the maintenance team to focus the outage window on installation and commissioning rather than incoming inspection.

Retrofit Support FAQ

Q1: Is the 1FK7022-5AK71-1LH0 a direct drop-in replacement for my existing 1FK7022-5AK7x motor?
A: In most cases, yes. The mechanical envelope, flange dimensions, and shaft diameter are identical across the 1FK7022-5AK7x family. The key suffix digits to verify are positions 7 (encoder type), 8 (brake option), and 9 (shaft/connector variant). The -1LH0 suffix indicates a smooth shaft with featherkey and no holding brake — confirm your application does not require a brake before ordering. If your existing motor has a brake (-1RH0 or similar), contact our technical team for the correct brake-equipped variant.

Q2: What commissioning steps are required after installing the 1FK7022-5AK71-1LH0?
A: After mechanical installation and cable reconnection, power up the SINAMICS S120 drive and perform a DRIVE-CLiQ topology scan via STARTER or Startdrive. Re-download the axis configuration to update the encoder data set, then run a short jog test at 10% speed to verify direction of rotation and encoder feedback. Check for active faults (F07900, F07801) before enabling the axis in automatic mode. Full commissioning typically takes 30–60 minutes for an experienced drive engineer.

Q3: Can this motor be used with a SINAMICS V90 drive as a replacement for a legacy axis?
A: The SINAMICS V90 supports selected 1FK7 motors via its built-in motor database. Compatibility depends on the V90 frame size and rated current. For the 1FK7022 (low inertia, 0.22 Nm rated torque class), the V90 0.4 kW variant is typically compatible. Use the Siemens V90 motor selection tool or contact KNMKS for a pre-verified drive-motor pairing to avoid parameter mismatch faults during commissioning.

Q4: What does the support terms confirmed by quotation cover, and how is it claimed?
A: The support terms confirmed by quotation cover all manufacturing defects, encoder failures, winding faults, and any defects identified during incoming inspection that were not caused by installation error or mechanical damage. To initiate a support terms claim, contact KNMKS at admin@knmks.com with the unit serial number, shipment date, and a brief fault description. Replacement units are dispatched from multi-region stock within 2 business days of claim approval, minimizing production impact.

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Siemens
Siemens

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1FK7022-5AK71-1LH0

Product Family

Servo Systems

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Available on request after model and quantity confirmation

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Servo drives, motors and cable sets

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Power, encoder and brake confirmation

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Motion upgrade and spare-part supply

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