A loose connection or broken cable between the drive and the motor. Troubleshooting & Solutions Check for Mechanical Obstructions:
) is too short, or the torque limits are set too low to overcome initial friction. Phase Failure:
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Drive trips during acceleration or while running at low speeds. The motor hums or vibrates but does not spin. Sudden trip upon startup. Causes of Siemens Fault 7902 siemens drive fault code 7902
Inspect gearboxes, belts, and couplings for visible damage or misalignment. Step 2: Verify Motor Parameterization
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 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 A loose connection or broken cable between the
Ensure the current limit is high enough to allow the motor to break away from a standstill. Step 4: Motor Identification Run
This article provides a comprehensive guide to understanding, diagnosing, and resolving the Siemens F07902 motor stalled fault, with a focus on commissioning, parameterization, and motor data identification. 1. What is the Siemens Drive Fault Code 7902?
Before changing any settings, ensure the motor can spin freely. Disconnect power to the drive. Drive trips during acceleration or while running at
): Ensure the maximum current limit is high enough to handle transient breakaway torque (typically set between 130% to 150% of the motor's rated current, provided the drive and motor thermal limits allow it).
Verify that mechanical brakes (if applicable) are fully releasing when the drive receives a start command. Step 2: Validate Motor Nameplate Data