Siemens 6SL3121-2TE21-0AA3 SINAMICS S120 Double Motor Module
A discontinued AA3 two-axis module for the 9 A class with an officially identified AA4 substitute.
Overview
6SL3121-2TE21-0AA3 is the AA3 generation of an external-air-cooled SINAMICS S120 Double Motor Module. It supplies two coordinated motor axes from the common DC link and exchanges control information through DRIVE-CLiQ. Siemens names the corresponding AA4 article as the substitute, so the installed suffix must remain visible during lifecycle planning.
Specs
| Manufacturer | Siemens |
|---|---|
| Order Number | 6SL3121-2TE21-0AA3 |
| 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 | PM410 product cancellation since 23 September 2014 |
| Official Substitute | 6SL3121-2TE21-0AA4 |
Features
- Combines two medium-current motor channels in one S120 booksize module.
- Draws power from the drive line-up common DC link.
- Uses the external cooling path designed into the control cabinet.
- Supports optimized pulse patterns and coordinated DRIVE-CLiQ diagnostics.
- Provides the hardware layer used by extended safety functions configured in the complete system.
Applications
- Exact AA3 spare replacement in existing two-axis S120 machines.
- Maintenance planning where the later AA4 reference is being evaluated.
- Paired motion axes that must retain the original cabinet cooling arrangement.
- Service events that restore a validated project archive to replacement hardware.
- Lifecycle review of discontinued motion-control power stages.
Lifecycle
- Siemens places this AA3 article in PM410 product cancellation.
- The named substitute is the AA4 article for the same nominal current class.
- Check connector, firmware, topology and safety-project requirements before using the substitute.
- Capture fault history and both axis parameter sets before isolation.
- Perform loaded operation and thermal observation after the approved commissioning sequence.
FAQ
Which later reference does Siemens name for this AA3 module?
The official record identifies 6SL3121-2TE21-0AA4 as the substitute.
Does the substitute guarantee an immediate drop-in exchange?
No. The complete drive system and project dependencies still require engineering verification.
Why are both motor parameter sets required?
One Double Motor Module serves two channels, and each axis has its own motor and control data.
What distinguishes this product from the TE15 model?
It belongs to a different output-current class even though the construction and family are similar.
Which condition should be observed during a load test?
Monitor drive diagnostics and the external-cooling path while both axes operate under the approved test plan.
What information should accompany a spare-parts enquiry?
Provide the complete order number, installed control unit, project version and replacement objective.
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