Siemens 1FK7032-5AK71-1LG3 Replacement for SIMOTICS S 1FK7

Product Overview

Siemens 1FK7032-5AK71-1LG3 Replacement & Upgrade Solution for SIMOTICS S 1FK7 Series: Smooth Transition from Legacy Servo Systems

The Siemens 1FK7032-5AK71-1LG3 is a compact permanent-magnet synchronous servo motor from the SIMOTICS S 1FK7 series, engineered for high-dynamic motion control in demanding industrial automation environments. Whether you are replacing a failed unit, upgrading from an older 1FK6 or 1FT6 series motor, or migrating an entire drive train from a legacy SINAMICS or MASTERDRIVES platform, this motor delivers a direct, low-disruption upgrade path with full compatibility across wiring, encoder interface, and mechanical mounting.

The 1FK7032-5AK71-1LG3 integrates seamlessly with the SINAMICS S120 drive system via the DRIVE-CLiQ digital interface, eliminating the need for separate encoder cables and simplifying commissioning. For sites still running older SIMODRIVE 611 or SIMOREG DC-MASTER systems, the motor can be adapted with appropriate SINAMICS S120 Booksize or Chassis power modules, allowing a phased migration without full control cabinet replacement. The motor’s compact flange dimensions conform to IEC 72 standards, meaning it fits directly into existing motor mounting brackets in most machine tool, packaging, and material handling applications.

Wiring compatibility is a primary concern during any servo motor replacement. The 1FK7032-5AK71-1LG3 uses a standard Siemens power connector and a DRIVE-CLiQ encoder connector, both of which are backward-compatible with existing SINAMICS S120 motor cable sets. If your installation uses older flying-lead or terminal-box wiring from a 1FT5 or 1FK6 motor, Siemens offers pre-assembled adapter cable sets that allow direct reuse of existing cable runs, reducing rewiring time and minimizing production downtime to a single shift changeover in most cases.

From a programming and parameterization perspective, the SINAMICS S120 drive automatically identifies the 1FK7032-5AK71-1LG3 via DRIVE-CLiQ on first power-up, loading the motor data set (MDS) without manual entry. If you are migrating from a SIMODRIVE 611 system with a SINUMERIK 840D or 810D CNC controller, the motor replacement requires only a parameter update in the drive configuration tool (STARTER or SINAMICS Startdrive), with no changes to the PLC program on the SIMATIC S7-300 or S7-400 controller managing the machine cycle.

For control cabinet space planning, the 1FK7032-5AK71-1LG3 is a frame size FS1 compact motor with a shaft height of 32 mm, making it one of the smallest members of the 1FK7 family. It is typically paired with a SINAMICS S120 Single Motor Module in Booksize format, which occupies minimal DIN rail space. In retrofit projects where cabinet depth is constrained, the SINAMICS S120 CX32 Controller Extension Module can distribute axis control without adding a separate control cabinet, preserving the original footprint.

Power supply compatibility is straightforward: the motor operates from a SINAMICS S120 Active Line Module or Basic Line Module providing a standard DC link voltage. Sites with existing SINAMICS S120 infrastructure can add this motor axis without modifying the line-side supply. For standalone replacement scenarios, a SINAMICS S120 PM340 Power Module in blocksize format provides a self-contained single-axis solution with integrated line filter, suitable for retrofit installations where a full S120 system is not already present.

Communication protocol compatibility extends to PROFIBUS DP and PROFINET IO, both supported natively by the SINAMICS S120 Control Unit CU320-2 DP or CU320-2 PN that governs this motor axis. No gateway or protocol converter is required when integrating into an existing SIMATIC S7 PLC network. For legacy PROFIBUS installations, the CU320-2 DP control unit maintains full backward compatibility with existing GSD-based device configurations, allowing the new motor axis to appear on the network without changes to the STEP 7 hardware configuration.

Spare parts and backup inventory planning is simplified by the 1FK7 series’ long production lifecycle and broad availability. Facilities managers running mixed fleets of 1FK7 motors across multiple machine lines can standardize on a single motor frame size for the FS1 class, reducing the number of unique spare part numbers held in stock. The motor’s DRIVE-CLiQ encoder stores all nameplate and calibration data electronically, so a replacement unit is fully operational immediately after mechanical installation and cable connection, with no encoder calibration or offset adjustment required.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete servo axis replacement or system migration typically involves more than the motor itself. When upgrading from a SIMODRIVE 611 or MASTERDRIVES platform to SINAMICS S120, the SINAMICS S120 CU320-2 PN Control Unit serves as the central axis controller, managing up to six motor modules from a single unit and communicating with the SIMATIC S7-1500 PLC over PROFINET IO. The SINAMICS S120 Active Line Module (ALM) provides regenerative line-side power conditioning, replacing the older non-regenerative rectifier units and improving overall energy efficiency of the drive cabinet.

For the motor power connection, the SINAMICS S120 Single Motor Module in Booksize format is the standard pairing for the 1FK7032-5AK71-1LG3, providing the DC link interface and PWM output in a compact DIN rail-mounted package. The DRIVE-CLiQ Hub Module DMC20 or DME20 allows daisy-chaining of multiple DRIVE-CLiQ devices — including the 1FK7032-5AK71-1LG3 and any additional 1FK7 or 1FT7 motors on the same axis group — reducing wiring complexity in multi-axis cabinets.

On the signal side, a SIMATIC ET 200SP distributed I/O station connected via PROFINET can replace legacy hardwired I/O panels, providing digital and analog I/O modules for limit switches, proximity sensors, and analog speed references without running long signal cables back to the main cabinet. For sites requiring galvanic isolation between the servo drive and field sensors, a SIMATIC S7 analog input module with integrated isolation or a dedicated signal isolator provides the necessary separation to prevent ground loop interference during commissioning.

If the existing machine uses a SINUMERIK 828D or 840D sl CNC controller, the 1FK7032-5AK71-1LG3 is fully supported as a feed axis or spindle motor through the NCU’s integrated SINAMICS drive interface, with axis data automatically populated from the DRIVE-CLiQ motor data set. A SINAMICS S120 Sensor Module Cabinet-Mounted SMC20 can be added if a second encoder — such as a linear scale — is required for high-precision closed-loop position control without replacing the motor.

Retrofit Guidance FAQ

Q: Can I reuse my existing motor power cables from a 1FK6 installation?
A: In most cases, yes. The 1FK7032-5AK71-1LG3 uses the same Siemens standard power plug connector family as the 1FK6. If your existing cable terminates in a flying lead or terminal box connector, Siemens pre-assembled adapter cable sets allow direct reuse without re-termination. Verify cable cross-section is rated for the motor’s rated current before reuse.

Q: Do I need to update my SIMATIC S7 PLC program after replacing the motor?
A: No PLC program changes are required if the drive parameters — speed scaling, torque limits, position resolution — remain the same. The motor replacement is transparent to the PLC. Only the SINAMICS drive configuration (motor data set) needs to be updated, which is handled automatically via DRIVE-CLiQ on first power-up.

Q: Is the PROFIBUS address and GSD configuration affected by the motor replacement?
A: No. The PROFIBUS address and GSD file are associated with the SINAMICS Control Unit (CU320-2 DP), not the motor. Replacing the 1FK7032-5AK71-1LG3 does not change the drive’s network identity or require any update to the STEP 7 hardware configuration.

Q: How much physical space does the 1FK7032-5AK71-1LG3 require compared to a legacy 1FT5 motor?
A: The 1FK7032-5AK71-1LG3 is significantly more compact than 1FT5 series motors of equivalent power rating. The FS1 frame with 32 mm shaft height typically requires 30–40% less axial depth, making it suitable for retrofits where cabinet or machine envelope space is constrained.

Q: What commissioning steps are required after mechanical installation?
A: Connect the DRIVE-CLiQ encoder cable and power cable, then power up the SINAMICS S120 drive. The drive automatically reads the motor data set from the encoder memory and configures the axis. Run a motor identification routine (rotating measurement) in SINAMICS Startdrive to optimize current controller gains for the specific installation. No manual encoder offset calibration is required.

Q: Can this motor be used as a direct replacement in a SINUMERIK 840D CNC machine?
A: Yes. The 1FK7032-5AK71-1LG3 is listed in the SINUMERIK 840D sl motor database. Select the motor from the axis configuration in SINAMICS Startdrive or the NCU’s drive configuration tool, and the correct motor data set is applied automatically. No manual data entry is required.

Warranty Assurance

Every Siemens 1FK7032-5AK71-1LG3 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 covering insulation resistance, encoder signal integrity, shaft runout, and connector condition. Units that do not meet Siemens factory specifications are quarantined and not shipped.

In the event of a warranty claim, TOPNLMS provides a direct replacement unit or full refund within the warranty period, with no requirement to return the defective unit before the replacement is dispatched in urgent production-down situations. Our after-sales response target is within 24 hours of claim submission on business days.

Stock is held in our Xiamen warehouse and is available for same-day dispatch on orders confirmed before 15:00 CST. International shipments are supported via DHL Express, FedEx International Priority, and sea freight consolidation for bulk orders. Export documentation including commercial invoice, packing list, and certificate of origin is provided as standard for all cross-border shipments.

For procurement teams requiring approved vendor documentation, TOPNLMS can provide a supplier qualification package including business license, quality management certification, and sample inspection reports on request.

Contact our technical sales team for availability confirmation, volume pricing, and lead time on the Siemens 1FK7032-5AK71-1LG3 and related SINAMICS S120 drive components.

© 2026 TOPNLMS. All rights reserved.
Original Source: https://topnlms.com
Contact: [email protected] | +86 18359293191