A Caution message in AFT Impulse.

Full message is:

Pump X is using a Standard Pump Curve and flow exceeded End of Curve. If no End of Curve was specified, this is the largest entered flow. (Y gal/min at Z% Pump Speed = α gal/min, β seconds) A four quadrant model may be appropriate - see the Help Topic "Four Quadrant Data Set Selection for details.

This caution indicates that the flow through the pump found to be past either the End of Curve setpoint or the last data point for the curve that the user has entered. In the transient simulation, the time listed is the first time that this End of Curve value is exceeded. The pump may operate past this point later in the simulation as well.

Users should ensure the pump curve and curve fit being used are still valid at this flowrate, and past this flowrate if the pump operates at higher flowrates later in the transient. Note that if the pump is operating at a speed other than 100%, Impulse will apply the Affinity Laws to the End of Curve or last data point entered for the pump at 100% speed.

There are several similar Warning messages that may occur when using a Standard Pump Curve (SPC). Users can read more about those warning messages Here.