Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 44)

Programming
43
Press key to advance to:
Use the and arrow keys to enter the % of the
required value you want to increase or decrease
when the second sensor input is below Level 1.
The chart on the previous page uses -10% as an example. This represents an application where the
second sensor is in a well or tank. When the pressure reading or the second sensor drops below
an acceptable minimum, the discharge pressure set point automatically drops by 10% to give the
tank or well time to recover. As soon as the pressure in the well reaches the minimum again, the set
point returns to normal.
Press the key to advance to:
Use the and arrow keys to enter the % of
required value you want to increase or decrease
when the second sensor input is above level 2. The chart on the previous page was -20% as an
example. This represents an application where the second sensor is a flow transducer in the dis-
charge line. When the flow reading on this second sensor goes higher than an acceptable maximum,
the discharge pressure set point automatically drops by 20% until flow demand is reduced. As soon
as flow is back below the maximum again, the set point returns to normal.
Hold the key to get out of the submenu.
Press the key to advance to:
Press both arrows to save the settings.
Ix. Multiple Pump Constant Pressure - Slave Pump
In applications where a second pump is required only for peak demand at limited times, a second
variable frequency drive is not needed. In such a situation, the AQUAVAR can start and stop a second
pump at full speed when it is needed for peak demand.
This method would not be desirable if the second pump is required frequently since the energy sav-
ing and lead/lag capability with a second AQUAVAR is not available with this method. A description
of a multi-pump system with more than one AQUAVAR is described in section X.
iNTENSiTy 1
+xx.x%
iNTENSiTy 1
-10.0%
t
t
iNTENSiTy 2
+xx.x%
iNTENSiTy 2
-20.0%
SUbMENU
OffSET
SAVE ??? +
t
t
SAVE ??? SAVED
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