E6581741
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12. Unusual diagnosis

12.1. Option error

An error message is displayed when the hardware error or software error or lose of
connection of wire is occurred.
When an option and a combination of the inverter are bad, it is displayed.
Display of trip information
e-23 (Error code : 55) : Optional unit fault 2

12.2. Disconnection error of network cable

When network trouble occurred by disconnection etc, the inverter does emergency stop
with the following indication when the network disconnection detection (c100, c523)
is set, and it was set in (c101=4).
Display of trip information
err8 (Error code: 27): Optional unit fault 1 (Communication error)