Cause : Motor overcurrent comes when the current drawn by the motor has exceeded the configured or allowable threshold, and the drive has tripped to protect itself and the motor.

f7801 fault in siemens drive indicate indicates motor overcurrent condition. This means the drive has detected that the current flowing to the motor has exceeded the permissible limit.

Common causes of fault 7801:

1. Mechanical overload – The motor may be driving a load that's too heavy or jammed.
2. Short circuit in motor or cabling – Check for damaged wires, loose connections, or insulation issues
3. Incorrect motor parameters – Mismatch between the drive settings and actual motor specs
4. Tuning issues – Poorly tuned current control loop or feedback issues.
5. Sudden load spikes – Rapid changes in torque/load demands may momentarily exceed current limits.
6. Drive or inverter issue – Internal fault or component failure in the power stage.

Steps for troubleshoot:

• Check for any mechanical jams or increased load.
• Inspect motor cables and connectors for shorts or damage.
• Verify motor nameplate data against drive configuration (especially rated current).
• Look into current monitoring/trending data if available.
• Reset the fault and observe if it recurs under certain conditions.
• Perform a motor insulation resistance test if a short is suspected.