Xylem HYDROVAR Smart - Manual (Page 21)

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7.3 Ramp Hysteresis
RAMP HYSTERESIS
80%
Level, where the fast ramps are changing to the slow
ramps
Possible setting: between 0%..100% of the window
Press ¾ on the Hydrovar-Smart to change to
7.4 Ramp 1: Fast running up time:
Time setting at Ramp 1, 2, 3, or 4 will influence the control of the pump and
MUST NOT BE CHANGED at normal operation. Possible setting of each ramp
0,05 - 1000 sec.
Please take care, that the ramp times of the connected VFD are every time faster than the
settings of the ramps 1-4 of the HYDROVAR-Smart!
The fast ramp times 1 and 2 are determined by the power of the connected drive.
(Standard settings = 4-15s, depending on the power)
RAMP 1
4.0 Sec
Excessively fast running up time may overload the
inverter in the starting moment.
Excessively slow running up time may cause a break
down of the outgoing pressure during operation.
Press ¾ on the Hydrovar-Smart to change to
7.5 Ramp 2: Fast running down time:
RAMP 2
4.0 Sec
Excessively fast running down time tends to cause
oscillation or hunting or can cause an error
(OVERVOLTAGE) during ramp down of the pump.
Excessively slow running down time tends to generate over pressure.
Press ¾ on the Hydrovar-Smart to change to
7.6 Ramp 3: Slow running up time:
The following ramps 3 and 4 determine the speed of the internal Hydrovar-Smart controller
and depend on the system, which should be controlled.
RAMP 3
70 Sec
A too slow running up time can cause a break of the
outgoing pressure during variation of the demand.
A too fast running up time may lead to oscillation
and/or overload of the inverter.
Press ¾ on the Hydrovar-Smart to change to