Siemens 6SL3121-2TE21-8AA3 SINAMICS S120 Double Motor Module
A cancelled 18 A two-axis S120 power stage with external air cooling and DRIVE-CLiQ integration.
Product Profile
6SL3121-2TE21-8AA3 is the higher-current AA3 Double Motor Module in this batch. It supplies two motor axes from the S120 common DC link and uses an external cooling interface. Because its rating and official portal weight differ materially from the TE21-0 variants, the complete TE21-8AA3 identifier must be kept intact.
Technical Data
| Manufacturer | Siemens |
|---|---|
| Order Number | 6SL3121-2TE21-8AA3 |
| Product Family | SINAMICS S120 |
| Module Type | Double Motor Module |
| Input | 600 V DC |
| Output | 400 V, 3 AC |
| Rated Output Current | 18 A / 18 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 1 October 2021 |
System Role
- Delivers two higher-current motor outputs inside a coordinated S120 drive system.
- Links power-stage control and diagnostics to the rest of the line-up through DRIVE-CLiQ.
- Uses the shared DC-link bus as the energy source for both axes.
- Transfers power-stage heat through the external-air cabinet arrangement.
- Supports the hardware basis for extended drive safety functions.
Compatibility
- Do not confuse the TE21-8 current code with the lower-current TE21-0 variants.
- Verify cabinet opening, fan path and mechanical support for the heavier module.
- Review line-module and DC-link capacity for the combined two-axis load.
- Match motor cables, protective earth and shielding to the approved machine drawings.
- Restore firmware-compatible topology and safety data before enabling either motor channel.
Applications
- Two-axis machinery requiring the higher-current external-cooling S120 format.
- Planned spare replacement in established AA3 drive cabinets.
- Lifecycle inventory for cancelled motor modules that remain in production assets.
- Recommissioning where both higher-power axes must be tested under controlled load.
- Maintenance projects that preserve the common DC-link and DRIVE-CLiQ architecture.
FAQ
What prevents confusion with the 9 A TE21-0 models?
The TE21-8 code and complete AA3 suffix identify the higher-current product.
Why should mechanical support be reviewed?
The official portal weight is higher than the lower-current variants and the cabinet design must carry the correct module.
Which upstream rating matters for both axes?
Check the line module and common DC-link capacity against the combined drive load.
What must be verified on each motor channel?
Confirm wiring, encoder data, rotation, control response and the relevant safety functions.
Is this exact order number still an active production article?
No. Siemens identifies it in product cancellation and presents it as a spare part.
What cooling evidence should be included in recommissioning?
Record airflow condition and observe thermal behavior while the approved load test is performed.
Recommended Models
| 125768-01 | Control4 C4-DR-PSU-M | MPC-302-W 6508573 |
| 2TP12-7 | ABB 2CDG 110 074 R0011 UD/S2.300.2 | DIMDR1300 |
| N10010-SW2 | LJ-G5001 | T15HD 60-345-02 |
| 88974041 M3 CD12-8I/40 | 181B0729 SPR-CMB21640 | ECINT1-1 730-802 RS232 RS485 |
| ADLY-4 | QVE1900 | SDI-1624 |
| 2CDG110090R0011 | ODC15-IDW | S7-300 SM321 6AG1321-1BL00-2AA0 |
| MX-OPT-RS1-EXT MX-232-IO-Box | AC6JAKS000 | T675A 1516 |
| 5001270 PC0780-1 | 5WG1140-1AB13 | SXWSC3XSELXX |
| SXWDOC8XX10001 | M102-M | SPR-8695PS |
| LF1B-NC3P-2THWW2-1M | C711 | 3HE05894AAAA01 ROHS6/6 0/70C IP9IAKLLAA |
