Ramp Hysteresis; Ramp 1: Fast Running Up Time; Ramp 2: Fast Running Down Time; Ramp 3: Slow Running Up Time - Xylem HYDROVAR smart Operating Instructions Manual

7.3

Ramp Hysteresis

RAMP HYSTERESIS
Possible setting: between 0%..100% of the window
Press 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
Press on the Hydrovar-Smart to change to
7.5

Ramp 2: Fast running down time:

RAMP 2
4.0 Sec
(OVERVOLTAGE) during ramp down of the pump.
Excessively slow running down time tends to generate over pressure.
Press 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
Press on the Hydrovar-Smart to change to
Level, where the fast ramps are changing to the slow
80% ramps
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.
Excessively fast running down time tends to cause
oscillation or hunting or can cause an error
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.
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