Ensure motor enclosures and feedback encoders are shielded from excessive vibration, dust, and ambient moisture.
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?
Check the operation of the mechanical holding brake. Ensure it receives the proper voltage signal to release when the drive starts. Step 2: Review Output and Power Cabling Electrical discontinuity mimics a mechanical stall.
If the above points pass but the fault persists, suspect drive hardware: siemens drive fault code 7902
For persistent cases, Siemens technical support can analyze a drive trace (via Startdrive recording function) to pinpoint whether the fault is load-related or hardware-related. Keep your motor parameters accurate, your cooling vents clean, and your sensor wiring intact—and fault 7902 will become a rare visitor in your maintenance log.
: The motor has run for the maximum number of hours specified in the drive configuration.
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Siemens Drive Fault Code F7902: Causes, Troubleshooting, and Fixes
: The drive allows for a minor, temporary deviation between these two values. This allowed deviation forms a threshold or "window".
The (frequently displayed as F07902 ) directly indicates a "Drive: Motor Stalled" condition. It triggers when a Siemens SINAMICS G120 , G120C, G120XA, or S120 drive detects that the motor speed has deviated significantly from the internal control loop model or the encoder feedback for a duration exceeding configured thresholds. It is a protective mechanism designed to prevent
This distinction is crucial for targeted troubleshooting.
[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