Xylem HV 1.1 - 1.2 - Manual (Page 32)

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ERROR DELAY:
Adjustable between 0...100 sec.
Delayed switch-off in the event of low water, terminal X2/6-X2/7) and also for the conveyor
limit ( see chapter 13.11.1).
By pressing the Ï and Ð button, you will be entering the
amount of time (sec) that the pump will run at the ERROR DELAY
10 s
programmed conveyor limit before it automatically shuts off.
After changing of the value, you have to confirm with the Î button. Then you will get the
message “SAVE PARAMETER” for a short time, when the new setting is saved!
Hold the Î button down for 3 seconds and you will be
returned to: SUBMENU
ERROR
Hold the Î button down again for 3 seconds to return to
the 1
st display
PRESSURE x.x bar
SPEED xx Hz
11.3 Single Pump – System Curve Compensation
The Hydrovar can automatically compensate
for system friction losses due to increased
flow. Tables are available in most pump
catalogues indication the amount of friction
loss that can be expected in various sizes of
pumps at different flow rates. Use these
tables to determine the friction loss for the
pipe size you are using at maximum flow
rate.
This Diagram shows a typical system curve. The system pressure set point is shown at
shutoff and pressure increase is shown for increasing flow.
Calculate the pressure required to overcome friction loss at maximum flow.