Fault Code 7902 | Siemens Drive
Decouple the motor from the load to see if the fault persists. If it runs fine while decoupled, the issue is likely the mechanical load or an unreleased brake. Enable Flying Restart:
The drive continuously monitors several internal metrics to calculate a stall condition:
In the context of Siemens SINAMICS drives (such as the G120 or S120), Fault Code F7902 signals that the motor has stalled
Yes, by setting p0600 = 0 (disable temperature monitoring). However, this removes overtemperature protection – .
If using an encoder, incorrect wiring or scaling can cause the drive to think the motor is not moving. Step-by-Step Troubleshooting Guide Follow these steps to diagnose and clear the 7902 fault. Step 1: Check the Mechanical System siemens drive fault code 7902
Siemens SINAMICS drives, including the popular G120XA and G120 series, are known for their robustness. However, motor control faults can occur, with being a common issue in both high-inertia applications and malfunctioning systems.
Siemens SINAMICS drives continuously model the expected motor behavior based on incoming current, voltage feedback, and encoder data (if present). The drive monitors specific mathematical thresholds to flag a stall: sinamics drive motor fault 7902 - SiePortal - Siemens
If fault appears at start command:
Follow this structured framework to isolate and resolve the root cause of Siemens fault 7902: Step 1: Perform Mechanical Inspections Decouple the motor from the load to see
Siemens drive fault code 7902 indicates a condition . This fault occurs when the drive detects that the motor is unable to rotate or maintain its speed despite receiving current. It is a protective mechanism designed to prevent permanent damage to both the motor windings and the drive's internal power electronics. Technical Context: What Does Fault 7902 Mean?
The load inertia is higher than what the motor was designed for, causing it to stall during acceleration. 2. Parameterization and Commissioning Issues
Lock out and tag out (LOTO) the drive following local safety protocols.
Measure the resistance across the motor phases to rule out open or short circuits. However, this removes overtemperature protection –
This is a diagnostic and troubleshooting report for .
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.
Several factors can lead to the appearance of fault code 7902 on a Siemens drive:
F07902 is rarely caused by a random software glitch. It is typically a direct symptom of a mechanical, electrical, or parameter configuration issue. 1. Mechanical Overload or Jamming
In Siemens SINAMICS drives (such as the G120, S120, or G120XA), fault code (or F07902 ) indicates a " Motor Stalled " condition.
