Siemens Drive Fault Code 7902 Jun 2026
The key to resolving 7902 lies in systematic isolation. Always check the mechanical load first, verify the encoder signal integrity second, and fine-tune the stall detection parameters (, p1744 , p1745 ) third. By understanding the relationship between the drive's internal "motor model" and the physical reality of the rotating shaft, engineers can quickly differentiate between a genuine mechanical jam and a software sensitivity issue, ensuring maximum uptime for industrial equipment.
[F07902 Motor Stalled Fault] │ ┌────────────────┼────────────────┐ ▼ ▼ ▼ Mechanical Electrical Software & Obstructions Failures Parameters ├─ Jammed load ├─ Bad phases ├─ Missing Motor ID ├─ Seized brg ├─ Brake issue ├─ Low current limits └─ Overload └─ Loose wire └─ Strict tolerances 1. Mechanical Jamming and Overload
Before adjusting digital parameters, rule out physical restrictions.
Siemens drive systems are highly reliable, but like all industrial automation components, they generate fault codes to protect hardware and maintain system integrity. One common issue encountered by engineers and maintenance technicians working with Siemens SINAMICS drives (such as the S120 or G120 series) is , which indicates a "Drive: Motor stalled" condition.
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If the drive detects that the measured values deviate radically from the mathematical model expected based on the entered nameplate parameters, or if the current cannot flow correctly, it aborts the test and throws F7902.
A faulty brake is a silent killer for F7902 faults.
This defines the speed below which a stall condition is considered. Lowering this value can prevent premature tripping.
The Siemens drive fault code indicates that motor has stalled or is out of step The key to resolving 7902 lies in systematic isolation
To effectively troubleshoot, we must split causes into two primary categories: and sensor/circuit faults .
Ensure the drive is operating in an environment that meets Siemens’ specified conditions. Check for adequate ventilation and that the ambient temperature is within recommended limits.
Understanding and Resolving Siemens Drive Fault Code 7902 The (often displayed as F07902 ) is a critical error indicating a "Motor Stalled" condition. This fault occurs when the drive’s control logic determines that the motor is not rotating as expected despite receiving power, or when the deviation between the calculated motor speed and the actual measured speed exceeds defined limits.
The (frequently displayed as F07902 ) is a critical safety and operational alarm that indicates a Motor Stalled condition. This fault triggers across multiple families of the Siemens SINAMICS product ecosystem—including the G120, G120XA, G120X, G115D, and S120 drives. When the drive's control unit detects that the motor cannot maintain its designated speed under load for longer than a predefined window of time, it immediately generates this fault to prevent hardware degradation. One common issue encountered by engineers and maintenance
Use embedded motor temperature sensors (PT100/PTC) wired to the drive to catch overheating before a stall occurs.
When F07902 halts your production line, follow this structured troubleshooting methodology to pinpoint and resolve the issue. Step 1: Perform Mechanical Inspections
The PI controller parameters (Proportional/Integral) are not suited for the motor and load, resulting in instability.
The causes of this fault can be broken down into mechanical issues, electrical failures, and parameterization errors. 1. Mechanical Blockage