Siemens 6SL3120-1TE24-5AA3 Retrofit-Compatible Motor Module

Siemens 6SL3120-1TE24-5AA3 Retrofit-Compatible Motor Module: Legacy System Compatibility & Smooth Upgrade

The Siemens 6SL3120-1TE24-5AA3 is a Single Motor Module within the SINAMICS S120 booksize format drive system, rated at 45A DC link current output. Designed for vector and servo control applications, this module is widely deployed in machine tool spindle drives, packaging lines, printing presses, and general industrial automation systems. As legacy SINAMICS S120 installations age and original spare parts become increasingly scarce, the 6SL3120-1TE24-5AA3 serves as a critical retrofit and replacement component — enabling engineers to restore full drive functionality without redesigning the control architecture or replacing the entire cabinet.

Whether you are recovering a failed axis on a CNC machining center, upgrading an aging servo drive cabinet, or extending the operational life of a multi-axis coordinated motion system, the 6SL3120-1TE24-5AA3 integrates directly into existing S120 booksize racks. It connects to the SINAMICS S120 Control Unit — such as the CU320-2 DP or CU320-2 PN — via the DRIVE-CLiQ interface, preserving the existing topology and eliminating the need for re-engineering the drive communication chain.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful retrofit of the 6SL3120-1TE24-5AA3 into an existing SINAMICS S120 system requires careful pre-installation planning across several dimensions. Before removing the failed module, engineers should document the current drive topology using STARTER or Startdrive software, exporting the project file to preserve all axis parameters, speed setpoints, torque limits, and encoder configurations. This backup is essential — it allows the replacement module to be commissioned with the same parameter set, dramatically reducing downtime.

The 6SL3120-1TE24-5AA3 shares the DC bus with adjacent modules on the same booksize rack. Verify that the Line Module — typically a 6SL3130-series Active Line Module or Smart Line Module — has sufficient power capacity to support the replacement motor module alongside all other axes. If the existing Line Module is already operating near its rated capacity, a power budget review is mandatory before proceeding.

DRIVE-CLiQ cabling must be inspected during the swap. The 6SL3120-1TE24-5AA3 uses standard DRIVE-CLiQ connectors, and the existing cables from the CU320-2 DP or CU320-2 PN control unit can typically be reused. However, if the installation has been in service for many years, inspect the DRIVE-CLiQ cables and connectors for wear, as communication faults on this interface can cause axis faults that mimic hardware failures. In multi-axis systems, the DRIVE-CLiQ topology — whether line, star, or ring — must be maintained exactly as configured in the original project.

Terminal wiring at the motor power output (U2, V2, W2) and the motor brake control terminals should be verified against the motor nameplate and the original wiring diagram. The 6SL3120-1TE24-5AA3 supports standard three-phase motor connections and integrated brake control, compatible with most Siemens 1FK7, 1FT7, and 1PH8 series motors commonly found in legacy S120 installations. If the motor encoder interface uses a Sensor Module Cabinet-Mounted (SMC) — such as the SMC20 or SMC30 — confirm that the encoder type (TTL, HTL, resolver, EnDat) matches the SMC configuration stored in the drive project.

For installations where the original module address or drive object number has been assigned in the PLC program — typically a Siemens S7-300, S7-400, or S7-1500 series controller communicating over PROFIBUS DP or PROFINET IO — no address changes are required at the hardware level, as the motor module address is managed by the Control Unit. However, if the PLC program references specific drive parameters via acyclic communication (e.g., BICO interconnections or parameter read/write via SFC14/SFC15), these should be verified post-commissioning to ensure the replacement module responds identically.

HMI screens connected to the system — whether a Siemens TP700, TP1200, or a third-party SCADA panel — typically display drive status via the PLC, so no HMI reconfiguration is required as long as the PLC program and drive parameter set are restored correctly. However, if the HMI reads drive parameters directly via PROFINET or OPC UA, verify that the data block mappings remain consistent after the module swap.

Physical installation space in the control cabinet must be confirmed before ordering. The 6SL3120-1TE24-5AA3 is a booksize format module and must be mounted on a standard S120 booksize mounting rail with adequate clearance for airflow above and below the module. Verify cabinet depth, rail spacing, and that the DC bus bar connectors align correctly with the adjacent modules. If the cabinet has been modified since original installation, a physical measurement check is recommended.

Downtime Control During System Migration

Minimizing production downtime during a motor module replacement is a primary concern for maintenance engineers. With the 6SL3120-1TE24-5AA3, the replacement process can typically be completed within a planned maintenance window of two to four hours, provided all preparatory steps have been completed in advance.

The most effective downtime reduction strategy is pre-commissioning the replacement module offline before the planned shutdown. Using STARTER or Startdrive, load the backed-up drive project onto a laptop and verify that the parameter set is complete and consistent. If a spare module is available, perform a bench test with a test motor to confirm the module powers up correctly and responds to basic motion commands before bringing it to the production floor.

During the actual swap, follow a structured sequence: isolate the DC bus by shutting down the Line Module first, discharge the DC link capacitors (allow at least five minutes after power-off before touching DC bus connections), remove the DRIVE-CLiQ cable, disconnect motor power terminals, and slide the module off the mounting rail. Install the replacement 6SL3120-1TE24-5AA3 in reverse order, reconnect all cables, and restore power. The Control Unit will automatically detect the new module via DRIVE-CLiQ and assign it the correct drive object number based on the saved topology.

After power-up, perform a function test at reduced speed before returning the axis to full production speed. Monitor the drive diagnostics in STARTER or on the CU320-2 panel for any fault codes — particularly F07900-series motor faults or A07910-series alarms related to encoder communication. If the system uses a Safety Integrated function (STO, SS1, SLS) via the TM54F Terminal Module or onboard safety terminals, verify that the safety function responds correctly before releasing the machine to operators.

By following this structured approach, most S120 booksize motor module replacements can be completed with minimal disruption to production schedules, protecting both the original program logic and the continuity of field control.

Retrofit Support FAQ

Q1: Is the 6SL3120-1TE24-5AA3 a direct replacement for other 45A S120 booksize motor modules?
Yes. The 6SL3120-1TE24-5AA3 is designed as a direct drop-in replacement for same-rated SINAMICS S120 booksize single motor modules. It uses the same DRIVE-CLiQ interface, DC bus connection, and mounting rail format. No hardware modifications to the cabinet or rack are required.

Q2: Can I reuse the existing motor power cables and encoder wiring?
In most cases, yes. The motor power terminals (U2, V2, W2) and brake control terminals are compatible with standard Siemens motor cable assemblies. Encoder signals are routed through the Sensor Module (SMC20/SMC30), which remains in place during the module swap. Inspect all connectors for wear before reuse.

Q3: What commissioning steps are required after installation?
After installing the replacement module, connect power and allow the CU320-2 to detect the new module via DRIVE-CLiQ. Load the backed-up drive project using STARTER or Startdrive, download parameters to the drive, and perform a motor identification run if required. Verify all safety functions (STO, SS1) before returning the machine to service. Full commissioning typically takes 30–90 minutes for an experienced engineer.

Q4: What warranty and supply terms apply?
All units supplied by NINERMAS are covered by a 12-month warranty against manufacturing defects and functional failures. Units are pre-tested before shipment to verify basic power-up and communication functionality. We maintain stock of the 6SL3120-1TE24-5AA3 and related S120 components to support urgent retrofit and breakdown recovery requirements. Contact our team for lead time and availability confirmation.