Siemens 6SL3121-2TE21-0AA4 SINAMICS S120 Double Motor Module
The later 9 A AA4 spare-part generation provides two externally cooled motor channels in the S120 drive line-up.
Product Profile
6SL3121-2TE21-0AA4 is the AA4 version of a SINAMICS S120 Double Motor Module for two coordinated axes. The product retains booksize construction, a common DC-link input and external air cooling. Siemens lists the exact article as a cancelled spare part, so lifecycle planning should identify it separately from the earlier AA3 version.
Technical Data
| Manufacturer | Siemens |
|---|---|
| Order Number | 6SL3121-2TE21-0AA4 |
| Product Family | SINAMICS S120 |
| Module Type | Double Motor Module |
| Input | 600 V DC |
| Output | 400 V, 3 AC |
| Rated Output Current | 9 A / 9 A |
| Construction | Booksize |
| Cooling | External air cooling |
| System Interface | DRIVE-CLiQ cable included |
| Safety Capability | Extended Safety Integrated functions supported |
| Lifecycle | Product cancellation; spare-part record |
System Role
- Converts energy from the shared S120 DC link into two controlled motor outputs.
- Coordinates topology and diagnostic data with the drive control through DRIVE-CLiQ.
- Uses the cabinet external-air path for heat removal from the power stage.
- Supports the optimized pulse behavior of the documented AA4 hardware generation.
- Provides the physical drive layer used by configured Safety Integrated functions.
Compatibility
- Match the complete TE21-0AA4 order number and not only the nominal current.
- Confirm cabinet opening, airflow and service clearance for the external-cooling construction.
- Verify control-unit firmware and the stored DRIVE-CLiQ topology.
- Restore the approved motor, encoder and safety parameters for both channels.
- The earlier AA3 article is a separate lifecycle record even though Siemens links it to AA4.
Applications
- Service replacement for installed AA4 dual-axis S120 machine groups.
- Maintenance stock planning for cancelled externally cooled motor modules.
- Paired servo axes that share one booksize power-stage assembly.
- Projects retaining the original drive family while production equipment remains in service.
- Controlled recommissioning based on an archived and validated S120 project.
FAQ
How is AA4 related to the earlier AA3 article?
Siemens identifies AA4 as the later substitute for the corresponding AA3 module, while maintaining a separate lifecycle record.
Why is the portal weight different from the AA3 listing?
The official records show separate values for the two hardware generations, reinforcing the need to use the exact suffix.
Which two-channel data must be restored?
Load the correct motor, encoder, control and safety settings for both configured axes.
What cooling check is specific to this construction?
Confirm that the cabinet external-air path is unobstructed and matches the module mounting interface.
Can a single-axis module replace this product?
Not without redesign; this article is a Double Motor Module with two motor channels.
Which commissioning evidence should be recorded?
Capture diagnostics, motor direction, loaded behavior and the result of every required safety test.
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