USB communication fault

What does E.USB mean?

This USB communication fault stops the inverter output if communication is interrupted for a duration longer than specified by Pr. 548 (USB communication check time interval). It indicates a loss of data integrity or physical connection over the USB link. This prevents remote control or monitoring via USB.

• Loose or damaged USB cable connecting the inverter to the PC/HMI, leading to intermittent signal loss.
• Electromagnetic interference (EMI) on the USB communication line, especially if the cable is not properly shielded or routed away from power cables.
• USB driver issues on the connected PC or an outdated firmware version on the inverter causing communication protocol mismatches.
• Configuration parameter Pr. 548 (USB communication check time interval) set too short for the application environment or communication speed.
• Faulty USB port on either the inverter or the connected external device (e.g., PC, programming tool).

Click steps to track your progress.

1. 1

   1. Replace the existing USB cable with a new, high-quality, shielded USB 2.0 or 3.0 cable, ensuring it is no longer than 3 meters.

2. 2

   2. Reroute the USB cable away from high-voltage power cables, motor cables, and other sources of electrical noise. Consider using ferrite chokes on the USB cable ends.

3. 3

   3. Verify that the correct USB drivers are installed on the connected PC. Update or reinstall the drivers if necessary. Check the inverter manufacturer's website for specific driver downloads.

4. 4

   4. Increase the value of Pr. 548 (USB communication check time interval) in the inverter to provide more tolerance for brief communication interruptions, starting with a 2x increase.

5. 5

   5. Test the inverter's USB port with a different PC or a known-good USB device, and test the PC's USB port with another device to isolate the faulty component.