Siemens 1FK7101-5AZ91-1ZZ9-Z Replacement for 1FK7 Series

Product Overview

Siemens 1FK7101-5AZ91-1ZZ9-Z Replacement for 1FK7 Series: Smooth Transition & Legacy System Compatibility

Upgrading or replacing a Siemens 1FK7101-5AZ91-1ZZ9-Z synchronous servo motor does not have to mean extended downtime or costly re-engineering. This 3 kW, 1FK7 Series permanent-magnet synchronous servo motor is a direct-fit replacement and modernization solution for aging SINAMICS and SIMODRIVE-based motion control architectures. Whether your existing installation relies on an older 1FT6 or 1FK6 frame motor, or you are migrating from a discontinued SIMODRIVE 611 drive system to the current SINAMICS S120 platform, the 1FK7101-5AZ91-1ZZ9-Z is engineered to minimize mechanical rework, preserve existing wiring topologies, and maintain program compatibility across Siemens SINUMERIK and SIMATIC motion controllers.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a legacy servo axis to the 1FK7101-5AZ91-1ZZ9-Z typically involves coordinating several interconnected components within the same control cabinet or machine frame. On the drive side, the SINAMICS S120 Booksize Motor Module (e.g., 6SL3120-1TE21-0AA3) provides the matched inverter output for this motor’s power class, replacing older SIMODRIVE 611 power modules without requiring a new cabinet cutout. The SINAMICS S120 Control Unit CU320-2 PN handles axis parameterization via PROFINET IRT and stores the motor data set automatically through DRIVE-CLiQ plug-and-play recognition — eliminating the manual encoder configuration steps required on predecessor platforms.

For installations where the existing SIMODRIVE 611 feed module or MASTERDRIVES MC inverter cannot be immediately replaced, a SINAMICS S120 CUA31 Control Unit Adapter can bridge the transition, allowing the new motor to operate temporarily within a mixed-generation drive line-up. On the signal wiring side, the MOTION-CONNECT 800PLUS DRIVE-CLiQ cable (pre-assembled, available in 1 m to 50 m lengths) replaces the legacy resolver cable run without re-routing conduit, as the cable diameter and bend radius are comparable.

Terminal block compatibility is maintained through the Siemens SINAMICS S120 Terminal Module TM31, which replicates the analog I/O and digital I/O pinout of the older SIMODRIVE 611 terminal board, preserving existing PLC wiring from a SIMATIC S7-300 or S7-400 CPU without rewiring the I/O marshalling panel. If the retrofit involves a newer SIMATIC S7-1500T motion controller, the axis technology object in TIA Portal V17 or later auto-detects the 1FK7 motor via DRIVE-CLiQ and pre-populates all dynamic limits, reducing commissioning time significantly.

Where cabinet space is constrained, the compact 1FK7 frame offers a shorter overall length compared to equivalent 1FT6 motors, freeing up depth in tight servo cabinets. Coupling the motor to existing gearboxes or ballscrew assemblies is straightforward, as the shaft diameter and keyway dimensions conform to the same DIN 748 standard used across the 1FK6 and 1FT6 families. A Siemens STARTER commissioning tool or TIA Portal Startdrive package is recommended for final drive parameterization and safety function validation (STO/SS1) before returning the axis to production.

Retrofit Guidance FAQ

Q: Can I reuse my existing motor power cable when replacing a 1FK6 with the 1FK7101-5AZ91-1ZZ9-Z?
A: The power connector on the 1FK7 uses an M40 circular connector (Siemens SpeedTec or standard bayonet). If your existing cable terminates in an M40 bayonet connector, it is directly reusable. For older M23 power connectors from 1FK6 installations, a Siemens-approved adapter plug (order no. 6FX8002-series) is available to avoid full cable replacement.

Q: Do I need to update my PLC program after the motor swap?
A: If you are migrating from a SIMODRIVE 611 (analog setpoint) to SINAMICS S120 (PROFINET/DRIVE-CLiQ), the drive interface changes from analog ±10 V to cyclic PROFINET telegrams (e.g., Telegram 105 for positioning). The SIMATIC S7 program will require updates to the motion FB calls (e.g., MC_MoveAbsolute, MC_Home). If the existing drive is already SINAMICS-based, only the motor data set needs refreshing — no PLC code changes are required.

Q: Is the holding brake wiring compatible with my existing brake relay circuit?
A: The integrated holding brake on the 1FK7101-5AZ91-1ZZ9-Z operates at 24 VDC, consistent with the brake voltage used on 1FK6 and 1FT6 predecessors. The brake control signal is routed through the motor signal connector, so the existing brake relay and 24 VDC supply can typically be reused without modification.

Q: How do I handle the DRIVE-CLiQ encoder migration if my current drive does not support it?
A: For drives without a native DRIVE-CLiQ port (e.g., older SINAMICS G120 or third-party inverters), a Siemens SMC20 Sensor Module Cabinet-Mounted can convert the DRIVE-CLiQ signal to a standard TTL/HTL incremental or SSI absolute encoder output, maintaining compatibility with the existing drive hardware while using the new motor.

Q: What is the physical installation clearance requirement?
A: The 1FK7101-5AZ91-1ZZ9-Z requires a minimum 50 mm clearance at the non-drive end for connector access and natural convection cooling. The motor flange bolt pattern matches the IM B5 standard, so no adapter plate is needed when replacing same-frame 1FK6 or 1FT6 motors.

Warranty Assurance

Every Siemens 1FK7101-5AZ91-1ZZ9-Z unit shipped by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each unit undergoes a multi-point outgoing inspection covering insulation resistance, encoder signal integrity, brake engagement force, and shaft runout — ensuring the motor arrives ready for immediate installation without additional incoming inspection overhead on your end.

In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund, with return freight covered. Our technical support team is available to assist with installation queries, drive parameterization guidance, and compatibility verification before and after purchase. Typical order processing is 1–3 business days, with DHL Express and FedEx International Priority options available for urgent replacement scenarios requiring next-flight-out logistics.

For volume procurement, blanket orders, or consignment stock arrangements for maintenance departments managing multiple 1FK7 axes, please contact our sales team directly to discuss lead time guarantees and pricing structures.