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Diagnostics Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 167
Issue Number: 1
6. If the autotune sequence is completed successfully the drive enable is set to inactive (Inhibit) and A26 (Motor Autotune B11) is set to zero.
7. The output motor contactors open.
8. The drive can only be enabled following completion of the auto tune by firstly removing the drive enable, and then re-applying.
9. If a trip occurs during the autotune sequence, the drive will go into the trip state and A26 (Motor Autotune B11) is set to zero. As above, the drive
enable must be removed and re-applied before the drive can be restarted after the trip has been reset. Care should be taken if the autotune
was not completed as the drive parameters that should have been measured and set-up will still have their original values.
The following describes the effects of the autotune test on drive parameters:
1. The Stationary autotune relies on the motor being stationary when the test is initiated to give accurate results.
2. Parameters associated with the motor and feedback (position feedback phase angle), are updated following successful completion of the
autotune test.
3. If the autotune test is not completed successfully, the parameters will retain their original values resulting in incorrect operation if the drive is
enabled.
4. When each stage of the autotune test is complete, the results are written to the appropriate parameters, and these parameters are saved in the
drive’s non volatile memory.
5. If Parameter Cloning (N01) is set to Auto (3) or Boot (4) the parameters are also written to a NV Media Card installed in the drive.
For diagnostic information following any drive trip which may occur during the autotune, refer to the diagnostics section.
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