Cause: Short-circuit/ground fault detected comes when a connection between one or more of the motor phases and the ground (earth) connection. This can also occur in the motor, cable, or drive.

7807 fault in siemens drive indicates Short-circuit/ground fault detected. This means a phase-phase short-circuit or ground fault was detected at the motor-side output terminals of the converter.

Troubleshooting Steps:

Follow these steps to correct 7807 fault in siemens drive:

• Check the motor cables are correctly connected to the drive's output terminals (U, V, W).
• Verify that the ground (PE) connection to the motor and drive is secure.
• Visually inspect the motor cable for any signs of damage, cuts, or abrasions.
• Check the motor terminals for any signs of burning or shorting.