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The n12 warning is an indicator that the motor name and motor number saved in the drive's eeprom does not match the motor name and motor number stored in the Endat encoder memory. When using an Endat encoder as primary feedback, the motor name and motor number must be stored in both the drive's memory and the encoder memory, and they must match. If the n12  warning displays, do the following:

Valid for S300, S400, S600, S700


Faults which occur, but which do not cause a switch-off of the amplifier output stage (BTB/RTO contact remains closed), are indicated in the LED display on the front panel by a coded warning number.
Possible reasons and countermeasures are described in the Online Help (Appendix Trouble Shooting)