Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 66)

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RA: Ramp F
min
acceleration Actual Value
RD: Ramp F
min
deceleration Output Frequency
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
Ramp settings:
• Time settings of the ramps influence the control of the pump.
• The fast ramps 1 and 2 are determined by the type (power) of the HYDROVAR and the
type of the pump.
Default = 4 sec.; depending on the power of the HYDROVAR they should be increased
up to 15s for higher power ratings to avoid overload error.
,
• The slow ramps 3 and 4 determine the regulation speed of the internal HYDROVAR
controller for small devices or constant consumption and depend on the system, which
has to be controlled. (Default = 70 sec.)
• The Ramps FminA and FminD are used for a start-up and shut off. These parameters
allow fast acceleration and deceleration and especially should be used for applications
where pumps or other devices are powered, which shouldn’t work below a determined
frequency for a certain time. (to prevent damages or decrease abrasion)
To adjust the Ramps, press
▲ or ▼
Set HYSTERESIS [0315] in %
set rated REQUIRED VALUE [02]
WINDOW [0310]
setting in % of
the required
MIN FREQ [0250]
t [s]
Set HYSTERESIS [0315] in %
FMIN TIME [0260]