In some applications, immediate trip on overtemperature is too aggressive. You can modify the response:
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.
Yes, by setting p0600 = 0 (disable temperature monitoring). However, this removes overtemperature protection – .
typically corresponds to: "PROFIBUS: Cyclic connection failed" (or PROFINET equivalent, depending on the telegram type)
Caps maximum current; if too low, the motor cannot pull enough torque to break a stall. Flying restart siemens drive fault code 7902
Check fault buffer. Often, overcurrent causes rapid heating, which then triggers 7902. Fix the overcurrent first.
Siemens drive fault code F07902 is a protective feature designed to shield your equipment from catastrophic failure. While a sudden stall often points to an obvious mechanical jam, chronic or intermittent F07902 faults are usually cured by fine-tuning torque limits, adjusting the stall delay timer (p2177), or ensuring that the drive's internal motor model accurately matches the physical asset on the plant floor.
To fix the problem permanently, you must identify why the phase failure occurred. Causes fall into four main categories:
Which (e.g., STARTER, BOP-2) do you use to change parameters? Share public link In some applications, immediate trip on overtemperature is
. This happens when the drive determines that the motor's actual speed deviates from the setpoint for longer than the configured delay time. Siemens SiePortal Primary Causes and Remedies sinamics drive motor fault 7902 - SiePortal - Siemens
Verify . Ensure it is set high enough to allow for the breakaway torque required during startup (typically 1.3 to 2 times the rated motor current, depending on the application). Check the torque limit parameters ( p1520 and p1521 ). Step 3: Adjust Stall Detection Thresholds
| Cause | Description | |-------|-------------| | PLC stop | Controller switched to STOP mode, stopped sending cyclic data | | Cable issue | PROFIBUS/PROFINET cable disconnected, damaged, or poorly terminated | | Connector fault | Loose or broken fieldbus connector (especially PROFIBUS 9-pin D-sub) | | Configuration mismatch | Telegram configuration (e.g., telegram type, length) differs between drive and PLC | | Bus overload | Excessive bus cycle time or high bus load causing intermittent telegrams | | Parameter error | p2040 (telegram monitoring time) set too low | | Master failure | Fieldbus master (PLC) power cycle or hardware fault | | Interference | Electromagnetic interference (EMI) on bus cable |
Set (Identify motor data at standstill) and give a run command to allow the drive to measure winding resistance and leakage inductance. This updates the internal mathematical model for better torque control. Conclusion If the encoder feedback jitters or lags, the
The drive was not properly tuned to the motor.
→ infinite ohms → fault 7902. Short circuit → near 0Ω → fault 7902.
Trying to accelerate a high-inertia load too quickly. 3. Electrical Issues
Increase the acceleration time to give the motor more time to reach speed without hitting the stall threshold. If you are using a SINAMICS G120XA