Communication Option Fault

What does E.OP1 mean?

The inverter output is shut off due to a communication line error in the installed communication option. This can stem from incorrect option settings, a loose plug-in option card, or a damaged communication cable, including improper termination. Loss of communication functionality can disrupt system control.

• Loose or improperly seated communication option card (e.g., network card like CC-Link, Profibus, Ethernet IP) in its slot.
• Damaged communication cable (e.g., broken wires, poor shielding) connecting the option card to the network.
• Incorrect network parameter settings on the option card (e.g., baud rate, station address, data format) not matching the network master.
• Bus termination resistor issues (missing, incorrect value, or incorrectly placed) causing signal reflections on the communication bus.
• Hardware failure of the communication option card itself or the inverter's main board interface to the option card.

Click steps to track your progress.

1. 1

   1. Power down the inverter, reseat the communication option card firmly into its slot, and verify all securing screws are tightened.

2. 2

   2. Inspect the communication cable for visible damage and verify continuity of all conductors using a cable tester.

3. 3

   3. Review and verify all communication parameters (e.g., Pr.117 Function selection for communication, network-specific parameters) against the network master's configuration.

4. 4

   4. Check bus termination resistors at both ends of the communication bus (if applicable, e.g., RS485, Profibus) to ensure correct value and placement.

5. 5

   5. Use network diagnostic tools (if available) to monitor communication activity and identify message errors or packet loss.