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Why might an ATV930 not Autotune?

Published date: 22 March 2019

Why might an ATV930 not Autotune?

Product Line:
Altivar ATV930 ATV950

All models

Setting Autotuning to "Apply Autotuning" results in "No action"

Sometimes the drive's configuration can prevent an Autotune. 
For instance, if the drive’s command channel is from a communication network such as Modbus, then a specific command word order must be sent before performing tuning with the keypad.
1- Power on the drive; ATV930’s state is NST
2- Write CMD = 6; ATV930’s state is RDY
3- Write CMD = 7; ATV930’s state is RDY
4- With the keypad, make “Autotuning” = “Apply Autotuning”; the tune isn’t done
5- Write CMD = 271; ATV930’s state is RDY
6- With the keypad, make “Autotuning” = “Apply Autotuning”; the tune is done
Another possibility is when the drive status is NST.
For instance, if the drive is set for 3-wire control and DI1 is not active, the status will be NST, and an Autotune is not allowed.

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