SIEMENS 6SL3420-2TE15-0AA1 Retrofit-Compatible Motor Module

SIEMENS 6SL3420-2TE15-0AA1 Retrofit-Compatible Motor Module for Legacy SINAMICS S120 Systems

The SIEMENS 6SL3420-2TE15-0AA1 is a Double Motor Module belonging to the SINAMICS S120 booksize format series, designed to drive two synchronous or asynchronous motors simultaneously from a shared DC bus. As legacy production lines age and original spare parts become increasingly difficult to source, this module has become a critical component in retrofit projects, discontinued-model replacements, and control cabinet upgrades across a wide range of industrial automation environments — including CNC machining centers, packaging lines, printing presses, and material handling systems.

At NINERMAS, we maintain verified stock of the 6SL3420-2TE15-0AA1 to support customers who need a reliable, tested replacement unit with a guaranteed 12-month warranty and fast international shipping.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

When integrating the 6SL3420-2TE15-0AA1 into an existing SINAMICS S120 system, engineers must carefully assess the full drive train architecture before committing to a swap. The S120 booksize platform operates on a shared DC bus topology, meaning the Active Line Module (ALM) or Smart Line Module (SLM) — such as the 6SL3130-7TE21-6AA3 or 6SL3130-6AE21-0AB0 — must have sufficient power headroom to support the combined load of all connected motor modules, including this unit.

The backplane connector on the booksize chassis carries both the DC bus voltage and the DRIVE-CLiQ communication signal. Before installation, verify that the existing booksize chassis or Control Unit Adapter (CUA31 or CUA32) has an available slot and that the DRIVE-CLiQ topology does not exceed the maximum node count supported by the Control Unit — typically a CU320-2 DP or CU320-2 PN. If the existing DRIVE-CLiQ chain is fully occupied, a DRIVE-CLiQ Hub Module (DMC20 or DME20) may be required to extend the topology.

Terminal wiring for the motor power output (U2, V2, W2 per axis) must be re-verified against the motor nameplate data. The 6SL3420-2TE15-0AA1 supports motors up to 5 A continuous per axis, so confirm that the connected servo motors — whether 1FK7, 1FT7, or third-party equivalents — fall within this current envelope. Encoder feedback is routed through Sensor Module Cabinet-Mounted units (SMC10, SMC20, or SMC30 depending on encoder type), and the existing SMC wiring harness can typically be reused if connector pinouts are verified.

For systems migrating from an older SIMOVERT MASTERDRIVES or SIMODRIVE 611 platform, the transition to SINAMICS S120 involves a full re-parameterization. Motor data sets must be re-entered or imported, and any existing PROFIBUS DP communication links will need to be mapped to PROFINET IO if the new Control Unit is a CU320-2 PN variant. In mixed-protocol environments, a SINAMICS Link or a CBE20 Communication Board Extension can bridge legacy fieldbus segments during the transition period.

Cabinet space planning is equally important. The 6SL3420-2TE15-0AA1 in booksize format requires a standard 35 mm DIN rail or direct panel mounting within a ventilated enclosure. Ensure that the minimum clearance distances above and below the module are maintained per the SINAMICS S120 Hardware Installation Manual to avoid thermal derating. If the existing cabinet uses a chassis-format drive such as the 6SL3310 series, a full mechanical redesign of the cabinet interior will be necessary.

Downtime Control During System Migration

Minimizing production downtime during a SINAMICS S120 motor module replacement requires a structured pre-commissioning approach. Before the scheduled maintenance window, use SINAMICS STARTER or TIA Portal to perform a full drive backup — exporting all parameter sets, drive object configurations, and DCC function block diagrams to a project file. This backup ensures that if the replacement module requires re-parameterization, the original logic can be restored within minutes rather than hours.

During the physical swap, label all DRIVE-CLiQ cables, motor power leads, and encoder signal cables before disconnection. The 6SL3420-2TE15-0AA1 uses the same booksize connector footprint as other S120 booksize motor modules, so mechanical installation is straightforward — but DRIVE-CLiQ node addressing is assigned automatically upon first power-up, and the Control Unit must recognize the new module before the drive can be enabled. If the module address conflicts with a previously stored topology, use the “Accept Topology” function in STARTER to update the drive object assignment.

For critical production lines where even a brief interruption is unacceptable, consider staging the replacement module in a parallel test cabinet, pre-loading the parameter set, and performing a hot-swap during a planned micro-shutdown. This approach — combined with pre-tested wiring harnesses and a verified firmware version on the replacement unit — can reduce the actual switchover time to under 30 minutes in most cases. All units supplied by NINERMAS are pre-tested prior to shipment and covered by a 12-month warranty, reducing the risk of commissioning failures caused by latent hardware defects.

Retrofit Support FAQ

Q1: Is the 6SL3420-2TE15-0AA1 a direct drop-in replacement for my existing S120 booksize motor module?
A: In most cases, yes. The 6SL3420-2TE15-0AA1 uses the standard S120 booksize mechanical and electrical interface. However, you should verify that the firmware version on your Control Unit (CU320-2 DP or CU320-2 PN) is compatible with the hardware revision of the replacement module. NINERMAS can provide the hardware revision details upon request before shipment.

Q2: What commissioning steps are required after installing the replacement module?
A: After physical installation, power up the system and allow the Control Unit to detect the new module via DRIVE-CLiQ auto-topology. Use SINAMICS STARTER or TIA Portal to accept the new topology, restore the backed-up parameter set, and perform a motor identification run if the motor data set was not previously saved. Verify encoder feedback signals and check for any active faults before enabling the drive.

Q3: Can this module be used to replace a single-axis motor module in my existing cabinet?
A: The 6SL3420-2TE15-0AA1 is a double-axis module. If your existing system uses a single-axis module, you can still use this unit — the second axis can be left unconfigured or used to drive an additional motor if needed. Confirm that the DC bus power budget accommodates the additional module width and standby current draw.

Q4: What warranty and testing does NINERMAS provide with this unit?
A: Every 6SL3420-2TE15-0AA1 supplied by NINERMAS undergoes pre-shipment functional testing and is covered by a 12-month warranty from the date of delivery. In the event of a warranty claim, NINERMAS provides a replacement unit or repair service with priority handling to minimize your production downtime. Contact sale@ninermas.com or call +0086 187 5021 5667 for warranty support.