Cause : Motor overspeed comes when the maximum permissible speed was either positively or negatively exceeded or the maximum permissible positive speed.

f7901 siemens indicates motor overspeed condition. This means the actual speed of the motor has exceeded the maximum permissible speed limit configured in the drive parameters.

Troubleshooting Steps:

Follow these steps to correct f7901 siemens fault:

• Check Maximum Speed Parameter.
• Inspect the encoder cable, shielding, and connections for any issues.
• Ensure all motor parameters (rated speed, voltage, frequency, etc.) are correctly entered in the drive.
• Observe the actual motor speed and compare it to the set-point and the maximum speed limit around the time the fault occurs.