Attempting to accelerate a heavy, high-inertia load too quickly via an aggressively short ramp-up time ( p1120p 1120
The Siemens drive fault code (specifically F07902 ) indicates that the motor has stalled . This fault occurs when the drive detects that the motor is no longer rotating as expected while under load or during acceleration. Primary Causes
In Siemens SINAMICS drives, fault code F07902 indicates a motor stall caused by mechanical overload, incorrect motor data, or improper configuration. Troubleshooting involves verifying motor nameplate data (p304-p311), running identification (p1900=2), and adjusting stall parameters like p2178 to prevent nuisance trips. For detailed troubleshooting steps, visit Siemens Support . sinamics drive motor fault 7902 - SiePortal - Siemens
For persistent cases, Siemens technical support can analyze a drive trace (via Startdrive recording function) to pinpoint whether the fault is load-related or hardware-related. Keep your motor parameters accurate, your cooling vents clean, and your sensor wiring intact—and fault 7902 will become a rare visitor in your maintenance log. siemens drive fault code 7902
Measure winding insulation resistance if required by your site schedule.
The 7902 code triggers based on internal software counters within the Siemens SINAMICS drive system.
: The physical load on the motor is too high, preventing it from reaching the required speed. Attempting to accelerate a heavy, high-inertia load too
) to ensure the drive truly understood the motor’s internal resistance. Adjusted Tolerance : They slightly increased the fault tolerance in and the delay time in to account for the heavy lifting cycles. Flying Restart : They ensured the "flying restart" function was active (
) forces the drive to hit its current limit immediately. If it cannot accelerate the load to the target speed before the stall timer expires, F07902 trips. 5. Sensorless Vector Control Issues at Low Speeds
To minimize the risk of encountering fault code 7902 in the future: Keep your motor parameters accurate, your cooling vents
As Marcus flipped the switch, the hoist roared back to life. The red light vanished, replaced by the steady, green "Ready" status. The symphony had returned to its proper rhythm. step-by-step technical guide to the specific parameters mentioned in the story? sinamics drive motor fault 7902 - SiePortal - Siemens
In the complex world of industrial automation, Siemens drives (ranging from the venerable Masterdrives to the modern Sinamics S120, G120, and S150 families) are known for their robustness. However, like any precision electronic equipment, they occasionally halt production with an error code. Among the more cryptic and frustrating alarms for maintenance technicians is .
Incorrect nameplate data (kW, Amps, RPM) entered during commissioning.
: Marcus checked the motor cables. A loose connection or a swapped phase (U and W cables) is a classic culprit that sends the drive into a tizzy. The Parameter Trap : Leo pulled up the drive parameters on the BOP-2 operator panel . "The threshold is set tight," he noted. The Resolution "Look at the delay," Marcus pointed to