Honeywell VFD CORE Installation Instructions Manual page 238

CHAPTER 12: DESCRIPTION OF PARAMETER SETTINGS
However, if the flow quantity or pressure is too big, VFD CORE will stop, one by one, the motors from using mains electricity until
VFD CORE decrease the main motor's frequency to 0Hz.
See next two figures.
Fig. 11. Sequence of switching motors at fixed quantity control with PID – decreasing demand.
63-4528—04
FREQUENCY
PUMP MAX
CP2000
OPERATION
OF FIRST PUMP
STOP PUMP
DEMAND
(FLOW OR PRESSURE)
TOTAL
OUTPUT
BY DRIVE
PUMP 0
AC MAINS OFF
PUMP 1
AC MAINS
PUMP 2
AC MAINS
PUMP 3
AC MAINS
PUMP 4
DEMAND
DEMAND
OFF
OFF
OFF
DECREASING DEMAND
238
M33775