INU-LSU comm loss

What does AF80 mean?

DDCS (fiber optic) communication between converters (e.g., inverter unit and supply unit) has been lost. The inverter unit will continue operating based on the last received status, but synchronized operation and full diagnostics are compromised. Loss of communication can lead to system instability or incorrect power flow.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify corresponding settings in the control program of the other converter.

2. 4

   Inspect fiber optic cable connections and replace cables if necessary.