Siemens 1FK7022-5AK71-1LH0 Replacement for SIMOTICS S-1FK7

Product Overview

Siemens 1FK7022-5AK71-1LH0 Replacement for SIMOTICS S-1FK7: Seamless Transition & Legacy System Upgrade

The Siemens 1FK7022-5AK71-1LH0 is a compact AC 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. As legacy servo systems age and original units reach end-of-life or become difficult to source, the 1FK7022-5AK71-1LH0 serves as a direct replacement and upgrade solution for older SIMOTICS S-1FK6, 1FK6022, and early 1FK7 variants that share the same frame size and mounting footprint.

This motor features a natural-cooled (suffix 1LH0) compact housing, a 2,000 rpm rated speed, absolute encoder interface (suffix 5AK71 indicating a 20-bit absolute encoder with DRIVE-CLiQ interface), and a shaft with keyway (suffix 1). These specifications make it a drop-in mechanical replacement for most 1FK6022 and early 1FK7022 variants installed in SINUMERIK 840D sl, 828D, and SINAMICS S120 drive systems.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from an aging servo system to the 1FK7022-5AK71-1LH0 involves more than swapping the motor. In most SINUMERIK 840D sl or SINAMICS S120 retrofit projects, engineers also address the drive module, feedback cabling, and I/O integration simultaneously to ensure system-level compatibility and minimize commissioning time.

On the drive side, the 1FK7022-5AK71-1LH0 pairs natively with the SINAMICS S120 Single Motor Module (e.g., 6SL3120-1TE13-0AA3) via DRIVE-CLiQ, eliminating the need for a separate encoder evaluation board that older resolver-based 1FK6 motors required. If the existing cabinet uses a SINAMICS S120 Booksize Control Unit CU320-2 DP or CU320-2 PN, no firmware upgrade is typically required for 1FK7 Compact series motors — the motor data set (MDS) is auto-detected through DRIVE-CLiQ on first power-up.

For wiring, the transition from legacy M23 resolver cables to DRIVE-CLiQ single-cable technology (using a MOTION-CONNECT 500 or MOTION-CONNECT 800PLUS prefabricated cable) simplifies the cable tray layout and reduces connector count in the control cabinet. If the existing cable conduit is retained, standard M23 power connectors on the 1FK7022-5AK71-1LH0 are pin-compatible with most 1FK6-era power cables, allowing reuse of existing wiring harnesses in many installations.

When the retrofit involves a SINUMERIK 828D controller, the axis configuration is handled through the SINUMERIK Operate HMI on the panel, and the 1FK7 motor data is available in the integrated motor database — no manual parameter entry is required. For older SINUMERIK 840D (non-sl) systems being upgraded to 840D sl simultaneously, the NCU 720.3B or NCU 730.3B module replacement is often performed in the same maintenance window, and the 1FK7022-5AK71-1LH0 is fully supported on both platforms.

In multi-axis gantry or coordinated motion applications, the 1FK7022-5AK71-1LH0 is commonly deployed alongside larger frame motors such as the 1FK7032 or 1FK7044 on secondary axes, all sharing the same DRIVE-CLiQ daisy-chain topology on a single S120 drive line-up. Terminal modules such as the SINAMICS S120 Terminal Module TM31 are used to integrate digital and analog I/O signals from the machine’s safety circuit and limit switches into the drive system without requiring a separate PLC I/O expansion rack.

For applications where the legacy system included a SIMODRIVE 611 universal HR drive, the migration path typically involves replacing both the drive and motor together. In this scenario, the 1FK7022-5AK71-1LH0 is paired with a new SINAMICS S120 PM340 Power Module or a Booksize Motor Module, and the machine program (NC part program) requires no modification — only the axis drive parameters are re-commissioned using STARTER or TIA Portal with the Startdrive add-in.

Retrofit Guidance FAQ

Q: Can I reuse my existing power cables from a 1FK6022 installation?
A: In most cases, yes. The 1FK7022-5AK71-1LH0 uses a standard M23 circular power connector with the same pin assignment as the 1FK6 series. Verify the cable cross-section matches the motor’s rated current before reuse. If the cable is more than 8 years old, replacement with MOTION-CONNECT 500 is recommended.

Q: Do I need to update the SINAMICS S120 firmware before connecting this motor?
A: The 1FK7 Compact series with DRIVE-CLiQ absolute encoder is supported from SINAMICS S120 firmware V2.6 onwards. Most installed S120 systems running firmware V4.x or later will auto-identify the motor on DRIVE-CLiQ enumeration. Check the firmware version on your CU320-2 before commissioning.

Q: Is the encoder protocol compatible with my existing SINUMERIK 840D sl system?
A: Yes. The 20-bit absolute encoder with DRIVE-CLiQ interface is natively supported by SINUMERIK 840D sl. The system reads the motor’s electronic nameplate (eNAMEPLATE) automatically, and the encoder offset is stored in the motor — no manual referencing is required after replacement.

Q: Will the motor fit in the same mounting space as my 1FK6022?
A: The 1FK7022 Compact uses the same Size 1 frame as the 1FK6022. The flange dimensions, bolt pattern, and shaft diameter are identical. No mechanical modification to the machine bed or coupling is required in standard installations.

Q: How do I handle the parameter transfer from the old motor to the new one?
A: With DRIVE-CLiQ, the motor data set is stored on the motor’s encoder chip. When the 1FK7022-5AK71-1LH0 is connected, STARTER or Startdrive will prompt to accept the new motor data. The axis-specific parameters (Kp, Tn, speed limits, torque limits) from the old drive project file should be re-entered or verified against the new motor’s rated values. A test run at reduced speed is recommended before full production restart.

Q: What communication protocols does this motor support?
A: The motor itself communicates via DRIVE-CLiQ to the SINAMICS drive. The drive communicates upstream via PROFIBUS DP or PROFINET IO (depending on the CU module variant) to the SINUMERIK or S7 PLC controller. No additional protocol converters are required in standard Siemens system architectures.

Warranty Assurance

Every Siemens 1FK7022-5AK71-1LH0 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each unit undergoes a pre-shipment functional inspection including insulation resistance testing, encoder signal verification, and visual inspection of connectors and shaft. Units are packed in anti-static foam with original or equivalent protective packaging to prevent transit damage.

In the event of a confirmed defect within the warranty period, TOPNLMS provides replacement support with priority processing. Our technical team is available to assist with commissioning questions, parameter configuration guidance, and compatibility verification before and after purchase. We maintain stock in Xiamen, China, enabling fast dispatch to customers across Asia, Europe, and the Americas.

For urgent replacement requirements — particularly in production-down scenarios — please contact us directly to confirm stock availability and arrange expedited shipping. We understand that servo motor failures cause immediate production loss, and our procurement process is designed to minimize your downtime from order to delivery.

All units are sourced through verified supply channels. Certificates of conformity and test reports are available upon request for quality-critical procurement processes.