To minimize the recurrence of fault 7902 in production environments, implement these ongoing preventative strategies:
. 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
He checked the DC link voltage. The capacitors in the line module were humming, charged and ready. But the second motor
If the motor vibrates violently or makes a growling noise during startup before tripping F7902 , you likely have a phase loss. siemens drive fault code 7902
A "Motor Data Identification" (MotID) or static optimization run was not completed correctly during commissioning. Ramp Settings: The acceleration ramp ( cap P 1120
Siemens drive fault code 7902 indicates a condition . This fault occurs when the drive detects that the motor is unable to rotate or maintain its speed despite receiving current. It is a protective mechanism designed to prevent permanent damage to both the motor windings and the drive's internal power electronics. Technical Context: What Does Fault 7902 Mean?
Set p1900 = 2 to enable motor data identification at standstill. To minimize the recurrence of fault 7902 in
If you are operating at the limits of your drive, the torque limiter may be triggering the 7902 fault.
Poor tuning of the sensorless vector control loops. Step-by-Step Troubleshooting Workflow
The most straightforward reason is a heavy mechanical load that exceeds the torque capacity of the motor or drive combination. If a mechanical brake does not release properly, or if downstream equipment (such as conveyors, pumps, or mixers) is jammed, the motor will lag behind its frequency command. 2. Missing or Incomplete Motor Commissioning The capacitors in the line module were humming,
: Improperly connected motor cables (e.g., swapped phases) or loose terminals.
Siemens Drive Fault Code 7902: Comprehensive Troubleshooting Guide