SINAMICS S120 | Single Motor Module
Siemens 6SL3120-1TE21-8AD0 SINAMICS S120 18 A D-Type Motor Module
Threefold-overload 18 A D-type module with a 54 A peak-current value for dynamic axes.
ManufacturerSiemensModel6SL3120-1TE21-8AD0Product TypeSINAMICS S120 booksize D-type Single Motor Module
01Product Identification
Siemens 6SL3120-1TE21-8AD0 is the D-type version of the 18 A SINAMICS S120 Single Motor Module. It converts the common DC link into a controlled motor output and provides 54 A peak current, compared with 36 A for the corresponding C-type article. The module includes internal air cooling, a DRIVE-CLiQ cable, optimized pulse patterns and support for extended Safety Integrated functions. Its selection is particularly relevant where the axis requires the higher D-type overload profile.
Configuration CheckUse the full article number and verify the current class, overload type, motor connection, firmware, safety project and cabinet design.
02Engineering Data
| Manufacturer | Siemens |
|---|---|
| Article Number | 6SL3120-1TE21-8AD0 |
| Product Family | SINAMICS S120 |
| Construction | Booksize D-type, internal air cooling |
| DC Link / Electronics Supply | 510 to 720 V DC / 24 V DC |
| Rated / Base-Load Current | 18.0 A / 15.3 A |
| S6 / Peak Current | 24.0 A / 54.0 A |
| Type Rating at IN / IH | 9.7 kW / 8.2 kW |
| Rated Pulse Frequency | 4 kHz |
| Motor Cable Length | 70 m shielded; 100 m unshielded |
| Cooling-Air Requirement | 0.009 m³/s |
| Power Loss, Typical / Maximum | 0.14 kW / 0.19 kW |
| Protection / Dimensions | IP20; 50 x 380 x 270 mm |
| Safety Integrated | SIL 2; PL d; Category 3 |
03Functions
Module Functions
- Provides a 54 A threefold peak-current capability for high-dynamic motor duty.
- Operates as a single-axis inverter from the modular S120 DC link.
- Supports servo, vector and V/f control frequency ranges stated in the Siemens data sheet.
- Implements extended Safety Integrated functions when used with supported system components.
- Maintains internal fan cooling within the 50 mm booksize D-type form.
- Communicates through the SINAMICS DRIVE-CLiQ topology.
Identification
- Manufacturer: Siemens
- Model: 6SL3120-1TE21-8AD0
- Product Type: SINAMICS S120 booksize D-type Single Motor Module
- Status: Active product
04Applications
Typical Engineering Use
- Highly dynamic servo axes requiring the documented 54 A peak-current margin.
- Machine-tool feed or spindle auxiliary axes within a modular S120 line-up.
- Packaging, handling or converting equipment with repeated acceleration and deceleration.
- Modernization of older 18 A AA-series positions using the documented D-type migration path.
- Cabinet designs that require a narrow 50 mm motor module and internal air cooling.
Compatibility Boundary
- Confirm D-type overload demand; the companion 8AC0 C-type article is limited to 36 A peak.
- Verify the DC-link, 24 V bus, Control Unit firmware and power-unit code.
- Match motor current, pulse frequency, cable length, encoder and brake requirements.
- Use Siemens adapter guidance when an old-format motor cable is retained.
- Validate Safety Integrated checksums, telegrams and acceptance tests after hardware exchange.
- Observe IP20 cabinet protection, airflow, grounding and shield termination requirements.
05Lifecycle
- Siemens lists this exact D-type article as an active product.
- It is the current threefold-overload migration path for legacy 18 A internal-cooled booksize modules.
- Older connections may require adapter cable 6SL3162-2ME01-0ACx or an updated motor-cable termination.
- Keep the full article number, firmware compatibility and safety project in spare-parts records.
- After replacement, perform controlled commissioning and document motor, overload and safety-function verification.
