Nastec VASCO - Page 20

20
parameter
default
desciption
Constant press.
Fix speed
Const.press.2val
Fix speed 2 val.
External speed
Constant temp.
Constant flow
0.5
It's the increase of pressure respect to pressure
set which must be passed so that there is a forced
shutdown of the pump.
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
0.5
The common parameters than you should get the
temperature above the temperature set so that
the pump, arrested earlier, are restarted.

1
It's the temperature rise compared to
temperature set which must be passed so that
there is a forced shutdown of the pump.

0.5
This value represents the flow drop below the set
flow required to start the pump.

1
It's the increase of flow respect to flow set which
must be passed so that there is a forced
shutdown of the pump.

Kp and Ki parameters allow the dynamic control
of system by VASCO; set values (Ki=50, Kp=005)
are usually enough to get a valid dynamic control;
if the set pressure do not consent a valid control,
proceed as follows; increase or reduce Ki while
keeping Kp constant; if the problem persists,
increase Kp value and increase or reduce the Ki
value again till a good dynamic control is reached.
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OFF
Function to activate (ON) the first auxiliary pump
DOL 1 (Direct On Line pump).
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OFF
Function to activate (ON) the second auxiliary
pump DOL 2 (Direct On Line pump).
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OFF
Function to allow alternating starting priority
between the DOL pumps in order to allow equal
use of them.
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1
delay time with which the pumps DOL start after
the variable speed pump has reached the
maximum frequency and the pressure value has
fallen below set pressure – delta start pressure
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OFF
Function to enable multiple VASCO’s to work in
parallel as described in the technical appendix
(see the relevant chapter). Up to 8 VASCO units
can be connected in parallel.
VASCO’s communication through RS 485 gates is
granted by a private protocol.

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Direct
Direct: increasing misured pressure, VASCO
decreases motor frequency.
Inverse: increasing misured pressure, VASCO
increase motor frequency.

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PI control
Direct/Reverse
COMBO
ON/OFF
Start delay AUX
t = XX [s]
Alternance
ON/OFF
Pump DOL 2
ON/OFF
Pump DOL 1
ON/OFF
Kp
XXX
Ki
XXX
Delta stop flow
Q = XXX.X [m3/h]
Delta start flow
Q = XXX.X [m3/h]
Delta stop temp.
T = XXX.X [°C]
Delta start temp.
T = XXX.X [°C]
Delta stop press
p = XX.X [bar]