Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 49)

multiple Pump Constant Pressure... continued
8. Enter the value required.
• Press to advance to the next screen:
• Enter the PSI drop before the next pump
starts. Use this value for each pump in the
AQUAVAR controller system.
9. Enable Seq. Ctl. 60.0 hz This tells the next
pump when the preceding pump has
reached its maximum speed.
• Press to advance to the next screen:
In most North American applications, this would be set for
58-60 hz. If you are using a 50 hz system, reset the display for 50 hz.
10. Switch Interval This allows you to set the amount of time before the “lead pump”
switches over to another pump in the system. This means that the first pump to turn
on when the system starts up will change when the switch interval time is reached. A
manual change over is also possible by using the in the first main menu display.
• Press to advance to the next screen:
• Use the to set the time desired.
(If set over 100 hours, the function is disabled.)
48
Programming
eNABLe SeQ. CTL. 60.0 hz.
Screen
SWITCh INTeRVAL
The next pump will not start until both the system pressure drop and maximum first pump speed have been
reached. If Enable Sequence Control is set higher than the maximum frequency, the next pump will not start.
Note
t
t
ACTUAL VALUE iNC. 0003 PSi
ACTUAL VALUE DEC. 000 PSi
ACTUAL VALUE DEC. 0002 PSi
Screen
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