Danfoss ADAP-KOOL Drive Programming Manual page 183

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ADAP-KOOL Drive Programming Guide
22-82 Work Point Calculation
Option:
[0] * Disabled
[1] Enabled
Function:
Example 1: Speed at System Design Working Point is known:
From the data sheet showing characteristics for the specific equipment at different speeds, simply
reading across from the H point and the Q
DESIGN
System Design Working Point. The pump characteristics at this point should be identified and the
associated speed programmed. Closing the valves and adjusting the speed until H
achieved allows the speed at the no flow point to be identified.
Square-linear Curve Approximation
Adjustment of par.22-81
curve to be adjusted infinitely.
Example 2:
Speed at System Design Working Point is not known: Where the Speed at System Design Working
Point is unknown, another reference point on the control curve needs to be determined by means
of the data sheet. By looking at the curve for the rated speed and plotting the design pressure
(H , Point C) the flow at that pressure Q
DESIGN
design flow (Q , Point D). the pressure H
DESIGN
points on the pump curve, along with H
calculate the reference point B and thus to plot the control curve which will also include the System
design Working Point A.
Disabled [0] : Work Point Calculation not active. To be used if speed at design point is known (see
table above).
Enabled [1]
: Work Point Calculation is active. Enabling this parameter allows the calculation of the
unknown System Design Working Point at 50/60 Hz speed, from the input data set in par.
22-83 Speed at No-Flow [RPM] par.22-84
Speed , par.22-88 Pressure at Rated Speed
Rated Speed .
MG.11.N1.02 - VLT ® is a registered Danfoss trademark
3 Parameter Description
point allows us to find point A, which is the
DESIGN
then allows the shape of the control
can be determined. Similarly, by plotting the
RATED
at that flow can be determined. Knowing these two
D
as described above, allows the frequency converter to
MIN
Speed at No-Flow [Hz] , par.22-87
, par. 22-89 Flow at Design Point and par.22-90
3
has been
MIN
Pressure at No-Flow
Flow at
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