-
39
-
9.
Utilities
9.1
Water Sources
Water sources having several water pumps can be operated by the
DREAM 2
in
various ways:
Static
– In the static mode the combination of pumps to be activated is
independent of the flow demand; it will always be the same static
combination as specified in the last column.
Flow
– the combination of pumps that will be activated depends on the
actual flow demand, except during the line filling period in which the
nominal flow will be used instead of the actual.
Nom. Flow
– the combination of pumps that will be activated always depends on
the nominal flow of the valves opened under the specific source.
When the selected mode of operation
is by "
Flow
" or by "
Nominal flow
"
the user must specify the various
combinations of pumps to be used for
each flow level. Each row of the table
describes
the
flow
and
the
combination that will be used, up to
this flow.
Delay Up
– when the flow demand
increases, the switching to the upper
combination will take place after the
specified delay.
Delay Down
– when the flow demand decreases, the switching to the lower
combination will take place after the specified delay.
Mode selection
window
Use F2=Levels for opening the
auxiliary screen for defining the
combinations of each flow level
Combination of pumps
to be used in static mode
Use F3=Change for opening
the mode selection window
Total flow capacity of the source
The auxiliary screen in which
the desired combinations per
flow level are defined
