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Does the Altivar 28 drive allow PI control to be combined with Auto/Manual so that a potentiometer can be used for PI setpoint in auto and speed Reference in manual?

Not exactly. The Auto/Manual feature does not operate if AIC is set to PIA.
However, if AIC is set to PII (PI with internal setpoint) a logic input can be set to rFc (Auto/Manual Reference Switching).
This allows the drive to use PI control using the rPI setting in the SEt menu as the setpoint when the input is energized.
With the input off, the drive will follow the reference signal on AI1 as a proportional speed reference.


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