Please differ the error messages like told in the manual:
F2903 tells that there is something wrong with the panel. Therefor it is clear that you cannot establish any connection to the drive via the panel. Please return the device back to services for inspection.
An alternative may be to try the connection directly to one of the EtherNet ports over network search using ctrlX DRIVE Engineering 01V14.1. Before you may have to deactivate EtherCAT. See:
F2901 tells that another problem is presented, see:
Mostly just wait until the booting has ended. If the problem is still present after waiting for more than 2 min check the network settings as described or get in touch with services.
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