Set (Motor data identification at standstill/Static Optimization).
Once resolved, implement these preventive measures:
Understanding the internal detection mechanisms, distinguishing it from related codes, and knowing how to adjust parameters systematically can help isolate and fix the root causes of an F07902 fault. The Technical Mechanics Behind Fault 7902 siemens drive fault code 7902
F07011 = Motor temperature model warning (pre-trip). F07902 = Trip threshold exceeded.
Connect to the drive using Siemens software (such as STARTER, Startdrive, or the BOP-2/IOP-2 operator panels) to verify key parameters. F07902 = Trip threshold exceeded
Before adjusting digital parameters, rule out physical restrictions.
The drive was not subjected to static optimization ( p1900=2 ) or rotating measurement during commissioning. The drive was not subjected to static optimization
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:
If using an encoder, monitor the actual speed value ( r0061 or r0063 ) against the setpoint speed during the brief moments before the drive trips. If the motor is physically spinning but the drive reads 0 RPM, check the encoder wiring, power supply, and shielding. Step 5: Run Motor Identification (ID)
| Cause | Explanation | |-------|-------------| | | KTY84 or PT100 open circuit. Drive interprets infinite resistance as overtemperature. | | Short circuit | Short across sensor leads = zero resistance, also interpreted as fault. | | Wrong sensor type configured | Parameter p0600 (temperature sensor type) set to “no sensor” but sensor wired, or vice versa. | | Sensor connected to wrong terminals | Example: KTY connected to terminals for PTC thermistor. | | Faulty sensor | Internal damage to the thermistor or RTD. | | EMI interference | Noisy signal lines cause erratic resistance readings. |
, this fault is frequently tied to asynchronous motors that haven't undergone proper static optimization. You can view the specific fault history and timestamps using the Siemens STARTER software TIA Portal specific parameter numbers for a particular Siemens drive series, like the