Siemens Drive Fault Code 7902

The drive has detected a speed or position discrepancy indicating the motor is not rotating as expected based on its current frequency, typically after motor identification or during operation.

Rotate the motor shaft manually to check for smooth rotation.

Disclaimer: This information is based on standard SINAMICS G120/S120 documentation and community feedback within the Siemens SiePortal . siemens drive fault code 7902

To resolve F7902, users typically follow a structured diagnostic process: Validate Motor Parameters: Ensure parameters such as (rated voltage), (rated current), and (rated speed) exactly match the motor's physical nameplate. Perform Motor ID: Re-run the identification procedure using

Disconnect the motor shaft from the load if possible, or attempt to rotate the machinery manually. The drive has detected a speed or position

The most common real-world cause is a physical restriction in the driven machinery. A seized bearing, jammed conveyor, blocked pump impeller, or excessive material load can prevent the motor shaft from rotating freely despite the drive supplying maximum current. 2. Incorrect Motor Parameterization

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This fault, often displayed as F07902 or simply 7902 on the drive’s operator panel, indicates a critical mismatch between the commanded speed and the motor's actual behavior. Simply put, the drive is demanding motion, but the motor is not responding appropriately. If you are facing this issue, this comprehensive guide will walk you through everything you need to know, from the fundamental cause of the error to advanced parameter adjustments that can resolve it.

Understanding the root cause is essential for efficient rectifying. The most common triggers include: 1. Mechanical Blockages or Overload

If you have landed here because your Siemens drive display or your PLC (Programmable Logic Controller) HMI (Human-Machine Interface) is flashing “F07902,” you are likely facing an unexpected downtime scenario. This article provides an exhaustive breakdown of fault code 7902—what it means, why it occurs, and step-by-step methods to troubleshoot and resolve it permanently.