In hoisting or vertical axis applications, a mechanical holding brake is often used. If the brake fails to release (due to a blown rectifier or sticky mechanism), the drive attempts to move against a locked brake, resulting in an immediate 7902 fault.
Ensure match the motor nameplate precisely.
In its simplest terms, this fault indicates that the drive has detected a condition. This means that despite the drive sending power and a command to rotate, the motor has either stopped turning entirely or is not rotating as expected. This guide provides a comprehensive analysis of fault F7902, exploring its causes—from simple mechanical jams to complex parameter mismatches—and offering a structured, step-by-step approach to diagnosis and resolution. siemens drive fault code 7902
: Verify and potentially increase the stall detection time or torque limits if the application involves high-inertia loads. Review Ramp Times
Re-run the motor identification at standstill ( p1900 = 2 ) to ensure the drive has accurate data from the motor's nameplate (p304–p311). In hoisting or vertical axis applications, a mechanical
user wants a comprehensive article about the Siemens drive fault code 7902. I need to gather information from multiple sources to cover all aspects. I will follow the search plan provided in the hints. This involves initial broad searches, deeper searches on specific topics, and supplementary searches for related models and visuals. I'll start with the first set of searches. initial search results have provided a substantial amount of information. I have results from Siemens Industry Support, click2electro.com, ManualsLib, and various Siemens community forums. These cover fault descriptions, causes, and potential solutions. I will now proceed to the deeper searches on tuning parameters and other drive models as outlined in the search plan. search results have provided a wealth of information from various sources, including Siemens support forums, manuals, and technical articles. I have enough material to structure a comprehensive article covering the description, causes, troubleshooting, and solutions for fault code 7902. I will now proceed to write the article. have gathered a substantial amount of information from various sources, including Siemens support forums, manuals, and technical articles. The material covers the fault description, causes, troubleshooting steps, and solutions. I will now structure the article with an introduction, sections on understanding the fault, mechanical vs. electrical causes, software parameters, troubleshooting steps, advanced considerations, and a conclusion. I will cite the relevant sources throughout.Troubleshooting and Resolving Siemens Drive Fault Code F7902: Motor Stalled**
or has it been running fine before?
If after following this guide the problem persists, contact Siemens Technical Support with your fault value ( R0949 ) and a STARTER trace file. In the vast majority of cases, however, the solution lies in one of the troubleshooting steps above. With a methodical approach, you can eliminate F7902 faults and restore reliable, productive operation to your industrial process.
For detailed technical guidance, you can consult the official SINAMICS G120 Manual or visit the Siemens SiePortal for community-driven troubleshooting. sinamics drive motor fault 7902 - SiePortal - Siemens In its simplest terms, this fault indicates that
Siemens Drive Fault Code 7902, while alarming, is a highly solvable problem. By understanding that it is a against stalling, you can systematically diagnose the root cause. Always start with the physical mechanics and wiring, then verify you have performed proper motor identification, and finally, adjust the stall monitoring parameters ( P2178 and P1745 ) to match the specific dynamics of your machine.
Verify and adjust the following parameters within your Siemens TIA Portal or Starter software: