DAB PUMPS ACTIVE DRIVER T/T 3.0 Instruksi Untuk Instalasi dan Pemeliharaan - Halaman 10
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Halaman Cetak8.5
OPERATION : TECHNICAL ASSISTANCE DISPLAYS AND SETTINGS
Access keys MODE & SET & + for 5 seconds
8.5.1
tb: Setting the reaction time of the water lack blockage
The setting of the reaction time of the water lack blockage allows you to select the time (in seconds)
taken by the ACTIVE DRIVER system to indicate the lack of water in the electropump. The variation
of this parameter may be useful if it is known that there is a delay between the moment in which the
electropump is switched on and the moment in which it actually starts delivering.
8.5.2
GP: Setting the gain of the proportional coefficient of the PI
For nearly all systems, the GP parameter set in the factory is the optimum one. However, if there
should be any problems in regulation, this setting may be adjusted. Indicatively it may be said that, for
example, the presence of great swings in pressure or of a slow response of the system to variations in
pressure may be compensated by high GP values. Instead the occurrence of "vibrations" in pressure
(extremely rapid pressure swings around the set point value) may be attributed to too high a GP value.
8.5.3
GI: Setting the gain of the integral coefficient of the PI
The integral value must be increased when the system is not very elastic, that is where there is absence
of any expansion. On the contrary, in systems with deformable pipes or with delays due to considerable
distances between the electropump and the ACTIVE DRIVER, the integral value must be lowered.
To obtain satisfactory pressure regulations, you generally have to adjust both GP and GI. In
fact it is the correct agreement between these two parameters which allows the optimum
pressure regulation.
8.5.4
FS: Setting the maximum rotation frequency of the electropump
The ACTIVE DRIVER allows the electropump to be fed for short periods at a frequency higher than
the rated one, returning then to 50 Hz without heating the motor.
When increasing the power supply frequency take care not to exceed the max. current of 9.3
A, otherwise there is a risk of blockage due to current overload in the power stages oF.
8.5.5
dP: Setting the pressure differential at low flow rates
In mode od=01, the setting of the allowed excursion for the pressure set point permits you to select a
pressure interval lower than the set point (SP) at which the ACTIVE DRIVER will regulate the
pressure in the event of low flow rates.
The advantage of selecting a dP different from zero lies in the redimensioning of the flow rate if there
are losses n the system and allows an energy saving so that the electropump can be operated at low
speeds when the requested flow rates are low.
To select the possible dP values, the ACTIVE DRIVER is equipped with a limiting system which
intervenes when pressure set points lower than 2.0 bar are set. In this case the dP is limited to 0.5. See
example on page 29.
8.5.6
Ft: Setting the low flow rate threshold
The ACTIVE DRIVER system possesses a flow sensor. Whenever the electropump is switched off a
new zero is acquired. The ACTIVE DRIVER switches off the electropump when the flow rate reading
is lower than 0 flow (ZF) + the set Ft parameter.
8.5.7
CM : Method of exchange (pre-set value 1) (excluding A.D. M/M 1.1)
When two ACTIVE DRIVER units are interconnected to work in exchange it is possible to choose
between two different strategies for alternating the switching on of the two electropumps.
CM = 0 :
The primary ACTIVE DRIVER is always the regulation leader and the secondary
ACTIVE DRIVER will be active as a booster (if Eb=2) or as a reserve (if Eb=1). If the
secondary machine remains unused for 23 hours, it becomes the leader until it has
accumulated one minute of regulation.
If during operation the leader electropump is unable to satisfy the user and the
secondary electropump is set as a booster (Eb=2), the latter will work at maximum
frequency, while the leader ACTIVE DRIVER will continue to modulate the rotation
frequency according to the user.
If the user decreases, the booster machine is switched off, while the leader machine
continues regulating.
ENGLISH
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