Siemens Drive Fault Code 7902 Jun 2026

Resolving this code involves checking the internal counters, performing the necessary physical maintenance, and resetting the drive parameters using tools like STARTER, Startdrive, or the Basic Operator Panel (BOP-2) / Intelligent Operator Panel (IOP-2). 1. Verify the Active Fault or Alarm

F07011 = Motor temperature model warning (pre-trip). F07902 = Trip threshold exceeded.

Siemens drives monitor two distinct types of rotation failures:

Increase p1610 (static torque setpoint) if stalling happens at low speeds.

In Siemens SINAMICS drives (such as the G120, S120, or G120XA), fault code (or F07902 ) indicates a " Motor Stalled " condition. siemens drive fault code 7902

Check r61 (Position) and r63 (Speed) while running. If necessary, change the rotation direction with p1821=1 . C. Mechanical Check

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.

To prevent the motor windings from overheating and to protect mechanical couplings, the drive automatically trips, cuts power output, and logs the F07902 error code. Primary Causes of Fault F07902

Before typing in numbers, ensure parameter p0300 (Motor Type) is precisely set (e.g., 1 for induction motor, 2 for synchronous motor). This changes the drive's underlying internal algorithms. Resolving this code involves checking the internal counters,

The mechanical load exceeds the torque capability of the motor, preventing it from accelerating. 2. Incorrect Parameter Configuration

Set (Motor data identification at standstill/Static Optimization).

Manually input the parameters exactly as written on the motor's rating plate: Rated Motor Voltage p305: Rated Motor Current p307: Rated Motor Power p308: Rated Motor CosPhi p311: Rated Motor Speed 4. Optimize the Motor

The Siemens drive fault code indicates a "Motor Stalled" condition. This occurs when the drive detects that the motor speed is significantly below the expected setpoint while it is delivering maximum torque or current. Deep Technical Insight: Why it Occurs F07902 = Trip threshold exceeded

Fault 7902 does not trigger instantly. The drive uses a specific monitoring algorithm that involves two main detection paths, governed by the status bits in parameter .

This parameter sets the allowable speed difference between the setpoint and actual speed in rpm . Impact: This is primarily used in encoder-based vector control. If the encoder feedback jitters or lags, the deviation might exceed P1744 , triggering the fault.

In technical terms, the drive’s internal motor model compares the expected motor speed (based on the setpoint) against the actual speed feedback (or an estimated value). If the deviation between what should be happening and what is happening exceeds a predefined threshold for a set amount of time, the drive shuts down and raises the F7902 fault to prevent damage to the mechanics, the motor, or the drive itself.

Disconnect drive terminals and measure resistance at room temperature. Should be ~600Ω. Use a hairdryer to warm probe—resistance should increase smoothly.