USB Communication Fault

What does E.USB mean?

The inverter output has shut off because USB communication was interrupted for a duration exceeding the time set in Pr.548 USB communication check time interval. This indicates a break in the USB connection or an incorrectly configured communication watchdog timer. Loss of communication will prevent external control and monitoring.

• Loose or damaged USB cable connection between the inverter and the host device (PC or HMI).
• Electromagnetic Interference (EMI) disrupting USB data lines due to unshielded cables or proximity to power wiring.
• Faulty USB port on either the inverter's control board or the connected host device.
• USB driver software malfunction or incorrect configuration on the host PC or HMI.
• Parameter Pr.548 (USB communication check time interval) set to an excessively short duration for the communication link.

Click steps to track your progress.

1. 1

   1. Replace the existing USB cable with a new, double-shielded (ferrite core recommended) USB 2.0 A-B cable (max 5 meters length).

2. 2

   2. Ensure the USB cable is securely connected to both the inverter's USB port and the host device's USB port.

3. 3

   3. Increase the value of Pr.548 (USB communication check time interval) by 50-100% to allow for minor communication delays.

4. 4

   4. Test communication using a different USB port on the host device or a different host device, if available.

5. 5

   5. Verify USB device drivers are correctly installed and free of errors in the host PC's Device Manager.