Xylem HYDROVAR (HV2.1 - 3.45) - Manual (Page 43)

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The parameters Window and Ramp Hysteresis and the Ramp settings as well are responsible
for the control characteristic of the HYDROVAR and also guarantee the stop of the pumps at 0
demand in boosters and water supply stations.
9.2 Window
WINDOW
5%
• Determines the band, where the slow Ramp changes to
the fast Ramp
• Possible setting: between 0% - 100% of required value
- for steep pump-curves and
closed loop systems ~20-30%
Press the ¾ button to change to the next parameter
9.3 Ramp Hysteresis
RAMP HYSTERESIS
80%
• Determines the band, where the fast Ramp changes to
the slow Ramp or rather the change between the slow
Ramps
• Possible setting: between 0% - 100%
- for an accurate controlling
(without automatic shut-off) ~99%
Press the ¾ button to change to the next parameter
R1: Ramp 1 – speed ramp fast increase
R2: Ramp 2 – speed ramp fast decrease
R3: Ramp 3 – speed ramp slow increase
R4: Ramp 4 – speed ramp slow decrease
Pressure, speed
set rated required value
Set hysteresis %
Set hysteresis %
Window setting
in % of the
required value
t time