Introduction to the 6SE7021-3TB71-Z
When your production line demands reliable variable-speed control, the 6SE7021-3TB71-Z delivers. This Siemens inverter is part of the SIMOVERT MASTERDRIVES MOTION CONTROL series, engineered for performance and durability. It is a compact unit with IP20 protection, ready for integration into your existing control system.
The 6SE7021-3TB71-Z operates on a DC input voltage of 510V to 650V, providing a nominal output current of 13.2A. With a power rating of 5.5 kW, it suits a wide range of motor control tasks. This unit includes documentation on CD, simplifying setup and reference.

Key Features & Technical Specifications
Below are the core specifications for the 6SE7021-3TB71-Z, as provided by the manufacturer:
- Product Type: SIMOVERT MASTERDRIVES MOTION CONTROL - PERFORMANCE 2 INVERTER COMPACT UNIT
- Input Voltage: DC 510V - 650V
- Nominal Current: 13.2A
- Power Rating: 5.5 kW
- Protection Class: IP20
- Documentation: Included on CD
The 6SE7021-3TB71-Z is designed for precise motor control. Its compact form factor saves cabinet space, while the IP20 rating allows for use in typical industrial enclosures. The unit’s performance characteristics make it a solid choice for applications requiring consistent torque and speed regulation.
Applications & Use Cases
This inverter is suitable for a variety of industrial applications, including conveyors, pumps, fans, and machine tools. For example, in a conveyor system, the 6SE7021-3TB71-Z can adjust belt speed to match production needs, improving efficiency. Similarly, in a pump application, it can modulate flow rates, reducing energy consumption. The unit’s robust design ensures reliable operation in demanding environments.

Installation & Setup
When installing the 6SE7021-3TB71-Z, follow the guidelines in the provided documentation. Ensure the DC supply voltage is within the 510V to 650V range. Mount the unit in a well-ventilated cabinet to maintain proper cooling. Verify all connections are secure before powering up. For detailed wiring diagrams and parameter settings, refer to the official Siemens manual.
Maintenance & Reliability
Regular maintenance is key to extending the life of your inverter. Periodically inspect the unit for dust accumulation and clean the heat sink if necessary. Check all terminal connections for tightness. Monitor operating temperatures to ensure they remain within acceptable limits. By following a routine maintenance schedule, you can minimize downtime and avoid costly repairs.
Compatibility & Integration
The 6SE7021-3TB71-Z is part of the SIMOVERT MASTERDRIVES family, designed to work with Siemens motors and control systems. It can be integrated into existing automation architectures using standard control interfaces. For specific compatibility details, consult the product documentation or contact AutoDCSTech.
Troubleshooting & Common Issues
If the inverter does not start, first check the DC input voltage. Ensure it is within the specified range. If the unit trips on overcurrent, verify the motor connections and parameters. For persistent issues, consult the troubleshooting section of the manual. Always follow safety procedures when working on electrical equipment.
Product Support & Availability
The 6SE7021-3TB71-Z is available through AutoDCSTech. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our team can assist with product selection and technical inquiries.
Availability & Condition at AutoDCSTech
| Part Number | 6SE7021-3TB71-Z |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | Germany |
