Siemens 6SL3121-1TE21-8AA4 SINAMICS S120 18 A Single Motor Module
The AA4 generation combines an 18 A single-axis output with external air cooling and defined 50 mm booksize dimensions.
Product Overview
Siemens 6SL3121-1TE21-8AA4 is an 18 A SINAMICS S120 Single Motor Module for one motor axis. It operates from the documented 510 to 720 V DC-link range and provides a 400 V three-phase motor output. The 50 mm wide booksize unit uses external air cooling, supports a 4 kHz rated pulse frequency and integrates through DRIVE-CLiQ. Siemens identifies the AA4 generation as cancelled.
Performance
- Provides an 18 A rated output current and a 15.3 A base-load current.
- Supports the documented S6 40 percent current of 24 A.
- Provides a documented maximum current of 54 A under the specified operating conditions.
- Uses a 4 kHz rated pulse frequency.
- Transfers cooling air externally at the documented 0.008 cubic metres per second requirement.
- Supports motor-cable lengths up to 70 m shielded or 100 m unshielded under the official limits.
Technical Details
| Manufacturer | Siemens |
|---|---|
| Order Number | 6SL3121-1TE21-8AA4 |
| Product Family | SINAMICS S120 |
| Module Type | Booksize Single Motor Module |
| DC-Link Voltage | 510 to 720 V DC |
| Motor Output | 400 V, 3 AC |
| Rated Output Current | 18 A |
| Base-Load Current | 15.3 A |
| S6 Current at 40 Percent | 24 A |
| Maximum Current | 54 A |
| Rated Pulse Frequency | 4 kHz |
| Dimensions | 50 x 380 x 226 mm |
| Cooling Method | External air cooling |
| Degree of Protection | IP20 / UL open type |
| Lifecycle | Cancelled |
System Integration
- Verify the 510 to 720 V DC-link range and 24 V control-supply conditions.
- Maintain the specified external cooling airflow and cabinet opening.
- Use the documented X1 motor connection and M5 protective-earth connection.
- Check motor-cable length against the 70 m shielded and 100 m unshielded limits.
- Restore DRIVE-CLiQ topology, motor data and safety parameters from the validated project.
Applications
- Single-axis SINAMICS S120 machinery requiring an 18 A booksize power stage.
- Replacement of an installed AA4 module with matching cooling and connector layout.
- Externally cooled cabinets designed for a 50 mm wide Motor Module.
- Drive systems using extended Safety Integrated functions.
- Lifecycle planning where the older AA3-to-AA4 relationship must be documented.
FAQ
What distinguishes the AA4 from the earlier AA3 generation?
AA4 is the documented successor generation for AA3, but full project, firmware, connector and safety compatibility still requires verification.
What is the rated output current of this module?
The official data sheet specifies 18 A rated output current.
Which cooling method is used?
The module uses external air cooling with the documented airflow path.
What cabinet width does the module occupy?
The official dimensions identify a 50 mm module width.
What motor-cable limits are documented?
Siemens specifies up to 70 m for shielded cable and 100 m for unshielded cable under the stated conditions.
Which values should be restored after replacement?
Restore the DC-link and motor connections, DRIVE-CLiQ topology, motor parameters, encoder data and validated safety settings.
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