Danfoss VLT Series Programming Manual page 158

Parameter Description
22-82 Work Point Calculation
Option: Function:
pump curve, along with H
allows the frequency converter to calculate the
reference point B and thus to plot the control
curve which will also include the System design
Working Point A.
H (head)
H
RATED
Par.
22-88
H
DESIGN
Set point
H
MIN
Par.:
22-83/
Control Curve
22-84/
22-87
[0] Disabled Work Point Calculation not active. To be used if
speed at design point is known (see ).
*
[1] Enabled 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 22-83 Speed at No-Flow
[RPM] 22-84 Speed at No-Flow [Hz], 22-87 Pressure
at No-Flow Speed, 22-88 Pressure at Rated Speed,
22-89 Flow at Design Point and 22-90 Flow at Rated
Speed.
22-83 Speed at No-Flow [RPM]
Range: Function:
Size [ 0 - par. Resolution 1 RPM.
related 22-85 The speed of the motor at which flow Is
*
RPM] zero and minimum pressure H
achieved should be entered here in RPM.
Alternatively, the speed in Hz can be
entered in 22-84 Speed at No-Flow [Hz]. If
it has been decided to use RPM in
0-02 Motor Speed Unit then 22-85 Speed at
Design Point [RPM] should also be used.
Closing the valves and reducing the
speed until minimum pressure H
achieved will determine this value.
22-84 Speed at No-Flow [Hz]
Range: Function:
Size [ 0.0 - Resolution 0.033 Hz.
related par.
*
The speed of the motor at which flow has
22-86 Hz]
effectively stopped and minimum
pressure H
entered here in Hz. Alternatively, the
speed in RPM can be entered in
22-83 Speed at No-Flow [RPM]. If it has
been decided to use Hz in 0-02 Motor
Speed Unit then 22-86 Speed at Design
®
VLT HVAC Drive Programming Guide
as described above,
MIN
D
B
A
C
Q Q
Q
DESIGN RATED
(flow)
Par. Par.
22-90
22-89
is
MIN
is
MIN
is achieved should be
MIN
®
MG.11.CC.02 - VLT is a registered Danfoss trademark
22-84 Speed at No-Flow [Hz]
Range: Function:
Point [Hz] should also be used. Closing
the valves and reducing the speed until
minimum pressure H
determine this value.
22-85 Speed at Design Point [RPM]
Range: Function:
Size [ par. Resolution 1 RPM.
related 22-83 -
*
Only visible when 22-82 Work Point
60000.
Calculation is set to Disable. The speed
RPM]
of the motor at which the System
Design Working Point is achieved should
be entered here in RPM. Alternatively,
the speed in Hz can be entered in
22-86 Speed at Design Point [Hz]. If it has
been decided to use RPM in 0-02 Motor
Speed Unit then 22-83 Speed at No-Flow
[RPM] should also be used.
22-86 Speed at Design Point [Hz]
Range: Function:
Size [ par. Resolution 0.033 Hz.
related 22-84 -
*
Only visible when 22-82 Work Point
par. 4-19
Calculation is set to Disable. The speed of
Hz]
the motor at which the System Design
Working Point is achieved should be
entered here in Hz. Alternatively, the
speed in RPM can be entered in
22-85 Speed at Design Point [RPM]. If it
has been decided to use Hz in
0-02 Motor Speed Unit, then 22-83 Speed
at No-Flow [RPM] should also be used.
22-87 Pressure at No-Flow Speed
Range: Function:
0.000 [ 0.000 - par. Enter the pressure H
*
22-88 ]
corresponding to Speed at No Flow
in Reference/Feedback Units.
Please also see 22-82 Work Point Calculation point D.
22-88 Pressure at Rated Speed
Range:
999999.999 [ par. 22-87 -
*
999999.999 ]
Please also see 22-82 Work Point Calculation point A.
is achieved will
MIN
MIN
Function:
Enter the value corresponding
to the Pressure at Rated
Speed, in Reference/Feedback
Units. This value can be
defined using the pump
datasheet.
157
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