Adrianmsmith the only thing that’s throwing me off that part is I’m testing with no puck resistance in the system. Just measuring output volume at various pressure settings.
Looking at the curves here matches what I’m seeing:
With no or little pressure, the flow rate will be at the maximum shown for the rpm. I’m referencing this for chamber fill rate only, before the valve shuts the pump off. With no puck, the system will shut off at the resistance of the sleeve, but once the pump is set beyond that pressure, it provides a continuous flow, because the shutoff pressure isn’t reached. However, for what I think I’m seeing to be correct, ACS would also be adjusting the rpm with the Preinfusion pressure settings rather than just shutting the pump off at the limiter, and I do agree there’s no real need to change pump rpm unless you’re trying to reduce noise (assuming the PSU can handle the max current). That said, there’s a chance someone wanted a gentler fill rate to “preserve puck integrity”, so the lower Preinfusion settings operate at lower flow rates. Maybe DaveC knows …