Product Description
The Siemens 6SE7021-3TB51 is a robust and reliable single-axis drive controller designed for demanding industrial applications. This SIMOVERT MASTERDRIVES Compact PLUS unit delivers precise motor control and offers a power output suitable for a range of automation tasks. It features advanced vector control technology, ensuring optimal performance and energy efficiency. The 6SE7021-3TB51 provides comprehensive monitoring and diagnostic capabilities, facilitating easy troubleshooting and maintenance. Its compact design allows for space-saving installation, and its durable construction guarantees long-term operation in harsh environments. This drive controller is a dependable solution for applications requiring accurate and efficient motor control.
Is Your Device Showing These Signs?
Siemens 6SE7021-3TB51 failures often stem from electrolytic capacitor degradation within the DC link, causing overvoltage faults and IGBT module failures due to excessive inrush current. Rectifier bridge diode failures are common, leading to undervoltage conditions and drive malfunction. Communication errors arise from issues within the PROFIBUS interface, requiring examination of termination resistors and cable integrity. Gate driver circuit malfunctions cause erratic motor control and potential short circuits. Cooling fan failures result in overheating and premature component degradation, necessitating immediate replacement to prevent thermal shutdown.
Technical specifications
The Siemens 6SE7021-3TB51 is a compact, high-performance single-axis drive controller designed for demanding industrial automation applications. This drive unit operates on a three-phase 380-480V AC power supply and delivers a continuous output current of 16A, suitable for motors up to 7.5kW. It features advanced vector control technology, ensuring precise speed and torque regulation across a wide operating range. Integrated safety functions, including STO (Safe Torque Off), provide enhanced machine safety. The 6SE7021-3TB51 supports various communication protocols, such as PROFIBUS DP, enabling seamless integration into existing automation systems. Comprehensive diagnostic capabilities and user-friendly parameterization software facilitate commissioning and maintenance. This drive controller is engineered for robust performance and reliability in harsh industrial environments, guaranteeing extended operational lifespan and minimal downtime.
Our Repair Process for the
6SE7021-3TB51
Our repair process for the Siemens 6SE7021-3TB51 begins with a comprehensive evaluation to pinpoint the fault. This involves rigorous testing of all components and circuits to identify the root cause of the issue. Once the problem is diagnosed, skilled technicians perform necessary repairs using high-quality replacement parts that meet or exceed original manufacturer specifications. Repaired units then undergo extensive functional testing under simulated operating conditions to ensure optimal performance and reliability. Finally, the unit is meticulously cleaned, carefully packaged, and promptly returned with a detailed repair report.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.

Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.

















