Fault Code 7902 - Siemens Drive

This defines the speed below which the motor is considered stalled. Default is often 20 RPM.

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F07011 = Motor temperature model warning (pre-trip). F07902 = Trip threshold exceeded. siemens drive fault code 7902

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The Siemens drive fault code F7902 (or 7902) Motor Stalled (or "Motor out of step"). This fault occurs when the drive detects that the motor is not rotating despite a torque or current being applied, or it has lost synchronism with the drive's output frequency. Common Causes Mechanical Overload: This defines the speed below which the motor

"What’s the code, Marcus?" Elias asked, pulling his laptop bag onto a nearby workbench.

This fault triggers the drive’s built-in monitoring function, which compares the current in all three phases (U, V, W) at the drive’s output. If the current in one phase falls below a specific threshold relative to the others, the drive assumes a cable break or motor winding failure and shuts down to prevent damage. F07011 = Motor temperature model warning (pre-trip)

Which (e.g., G120X, S120) are you using?

Elias Thorne, a third-shift maintenance technician with twenty years of grease under his fingernails, sat in the breakroom nursing a lukewarm coffee. He was staring at the clock. It was 2:00 AM. In the world of industrial automation, 2:00 AM is the witching hour—the time when bearings decide to seize, sensors decide to sleep, and PLC logic decides to glitch.

is unequivocally a power delivery warning . In 95% of cases, the problem is external to the drive: a loose wire, a failing contactor, a damaged cable, or a motor winding opening. Only in about 5% of cases is the drive’s own output stage at fault.

"It’s a 7902," Marcus said, reading the 7-segment display on the BOP (Basic Operator Panel). "Just '7902'. I tried resetting it, but it just clicks and throws the same code again."