8.7.3 Changing the stop criteria
Hya-Solo DV with PumpDrive recognises whether the flow rate supplied is actually
used.
When the system has reached its steady state (the actual value has reached the
setpoint within the programmed hysteresis for pressure fluctuations 5), PumpDrive
increases the setpoint by a value 3 (test pulse) for a period of time 2.
If the flow rate is zero, this pressure increase will continue to be applied. PumpDrive
reduces the speed to the set minimum output frequency (3-6-1-2). If the pressure
increase continues to be applied for the period of time 7 measured from the moment
at which the speed drops below the minimum speed before stopping 6, the
PumpDrive will stop the pump subsequently. The drive remains in stand-by mode.
If the flow rate consumed rises again, the pressure in the system drops and
PumpDrive starts the pump again after the delay time 8 when the cut-in hysteresis 4
has been reached.
If the motor speed drops below the value of parameter 3-4-3-4 6, PumpDrive switches
the pump to stand-by mode after the delay time 7 without carrying out a test pulse
cycle through setpoint compensation (2, 3).
1
2
8
7
6
5
4
3
A
B
C
Fig. 14: Changing the stop criteria
A
Setpoint
B
Pressure
C
Speed
1
Waiting time until activation
Parameter: 3-4-3-6
2
Duration of test pulse
Parameter: 3-4-3-9
3
Setpoint increase/pulse
Parameter: 3-4-3-8
4
Hysteresis for closed-loop control
Parameter: 3-4-3-2
5
Hysteresis for pressure variations
Parameter: 3-4-3-7
6
Minimum speed before stopping
Parameter: 3-4-3-4
8 Operating the Pressure Booster System
38 of 56
Hya®-Solo DV
