Siemens 6SL3126-2TE21-8AA3 SINAMICS S120 Double Motor Module
A two-axis S120 power stage for a higher shared current class, identified by its AA3 suffix and cold-plate construction.
Product Overview
This Double Motor Module supplies two controlled motor axes from one booksize SINAMICS S120 component. It belongs to the cold-plate family and retains the AA3 hardware ending, making it a distinct item from air-cooled and later-generation variants. Both channels participate in the common DRIVE-CLiQ and DC-link architecture.
Performance
- Provides two higher-current motor channels in a consolidated module.
- Coordinates both power stages through the S120 control and DRIVE-CLiQ topology.
- Uses optimized pulse patterns associated with the documented hardware version.
- Supports system-level Extended Safety Integrated functions for both configured axes.
- Transfers the combined thermal load into the engineered cold plate.
Technical Details
| Manufacturer | Siemens |
|---|---|
| Order Number | 6SL3126-2TE21-8AA3 |
| Product Family | SINAMICS S120 |
| Module Type | Double Motor Module |
| DC-Link Input | 600 V DC |
| Motor Output | 400 V, 3 AC |
| Rated Output Current | 18 A / 18 A |
| Construction | Booksize |
| Cooling Method | Cold-plate cooling |
| System Interface | DRIVE-CLiQ cable included |
| Safety Capability | Extended Safety Integrated functions supported |
| Product Lifecycle | PM300 Active Product |
System Integration
- Verify the project and cabinet are designed for this exact two-channel current and hardware suffix.
- Size the cold-plate assembly for the combined heat output of both active axes.
- Follow the documented DC-link, protective-earth, motor and DRIVE-CLiQ connection sequence.
- Keep motor, encoder and safety data separated by channel during restore and comparison.
- Commission each axis under controlled load before testing coordinated motion.
Applications
- Two-axis motion groups requiring a higher shared output class in limited cabinet width.
- Machines with an engineered cold plate instead of internal or external air cooling.
- Exact AA3 spare support for installed double-motor drive line-ups.
- Coordinated axes that must retain validated S120 topology and safety settings.
- Planned retrofit work where both motors and the common thermal interface are reviewed together.
FAQ
What distinguishes 6SL3126-2TE21-8AA3 from a Single Motor Module?
The 2TE designation identifies a Double Motor Module with two controlled outputs.
Why is the AA3 suffix procurement-critical?
It identifies the exact hardware generation and must not be replaced by a partial current-class description.
How should the cold plate be assessed for this module?
Check surface condition, mounting interface and thermal capacity for simultaneous loading of both channels.
Which records should remain separate for the two outputs?
Keep motor, encoder, tuning, safety and test records assigned to their correct axis.
Is 6SL3126-2TE21-8AA3 still active?
The official Siemens product record classifies it as a PM300 Active Product.
What completes a successful dual-axis replacement?
Both axes must pass electrical, direction, load, thermal, diagnostic and safety checks.
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