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How do I adjust the speed of the unit if there is no speed pot or external reference present on the ATV28.

You can adjust the LSP parameter each time want to change speed in the SET menu.

The reason you are able to change the speed in this fashion is because with no reference signal on AI1, AI2, no speed potentiometer option, nor external keypad option allowing for local control - when the drive receives a run signal (direction signal) it automatically runs at low speed if not in a fault condition or being to stop.

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