Delta CFP2000 Series User Manual page 427

Chapter 12 Description of Parameter SettingsCFP2000
However, if the flow quantity or pressure is too large, the CFP2000 stops, one by one, the motors
use mains electricity until the CFP2000 decreases the main motor's frequency to 0 Hz. See Diagram
12-10 and Diagram 12-11.
Diagram 12-10: Sequence of Fixed Quantity Control with PID – Decreasing Demand
12.1-12-12