I have no information on Amada with 6P, but if you refer to the electrical drawings it should explain, you will only need to change the transformers that have 440 supply to them, any other transformers that are fed from the secondary of these transformers do not need to be changed.
If there are other unmarked transformers connected to the 440, and they have input taps then you may need to find out by using a meter by voltage check to find out the 220v input, if they have one.
Check the schematics for any other circuits connected to 440v, I would not expect a great deal apart from the transformers.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.