This guide is for informational purposes. Always follow local safety regulations and the official Siemens manual for your specific drive model. Disconnect power before handling cables or connectors.
If the parameters are flawless, the issue is likely a physical barrier preventing the identification current from flowing evenly across all three phases.
| Solution | Action | |----------|--------| | Restart communication | Cycle PLC power or reinitialize bus from master | | Correct telegram mismatch | Set same telegram type (e.g., Standard Telegram 1) in both PLC hardware config and P0922 | | Adjust monitoring time | Increase P2040 to 200–500 ms to avoid nuisance trips | | Re-parameterize drive | Load factory defaults (p0010=30, p0970=1) and reconfigure fieldbus settings | | Replace/repair bus cable | Check continuity, shielding, and termination |
If the issue persists, it may be necessary to contact Siemens technical support or a qualified service technician. They can provide guidance specific to your situation and perform repairs if needed. siemens drive fault code 7902
Sometimes the motor is not truly stalled but experiences a heavy load spike (e.g., a crusher hitting a rock). If the delay time ( p2178 ) is set too short, the drive trips before the load can break free.
Unlike fault 7900 (Motor Blocked), which usually occurs at very low speeds, typically triggers when the motor enters a current limit above a specific speed threshold. The drive monitors the deviation between the speed setpoint and the actual speed feedback (or estimated speed in encoderless mode). Primary Causes & Parameters
If the fault occurs on a SINAMICS G120XA, follow this Siemens recommended procedure : the converter to factory settings. Set (V/f) or (Vector). Enter motor nameplate data ( p0304p 0304 p0311p 0311 Set (Quick commission). Set (Ident. at standstill). Start the motor in Hand mode to run the motor ID. Critical Parameters to Review p0346p 0346 This guide is for informational purposes
Fault F7902 is triggered during a commissioning or tuning phase known as or Line Data Identification . During this sequence, the Siemens inverter injects specific current pulses into the motor stationary windings (or the incoming supply line) to calculate critical internal variables. These variables include stator resistance, leakage inductance, and rotor time constants.
While related to , F07902 typically triggers at higher speeds or under specific torque conditions where the drive is attempting to move the motor, but the feedback or calculated model indicates it is not following the command. Common Causes of Fault 7902 sinamics drive motor fault 7902 - SiePortal - Siemens
This is a diagnostic and troubleshooting report for . If the parameters are flawless, the issue is
Captures a spinning motor; prevents stall trips on a free-wheeling load. Primary Causes of Siemens Fault 7902 1. Mechanical Jam or Extreme Overload
If you can tell me the (e.g., G120X, S120), motor type , and application (e.g., pump, fan, conveyor), I can help you identify more specific parameters to check . sinamics drive motor fault 7902 - SiePortal - Siemens
F07011 = Motor temperature model warning (pre-trip). F07902 = Trip threshold exceeded.