22-82 Work Point Calculation
Option: Function:
at that îš…ow can be determined. Knowing these 2
points on the pump curve, along with H
MIN
as
described, allows the frequency converter to
calculate the reference point B and thus to plot
the control curve, which also includes the system
design working point A.
Set point
Control Curve
n
D
E
S
I
G
N
-
f
D
E
S
I
G
N
n
R
A
T
E
D
-
f
R
A
T
E
D
(head)H
H
RATED
Par.
22-88
Q
DESIGN
Par.
22-89
H
MIN
D
B
C
A
Q
RATED
Par.
22-90
(flow)
Q
H
DESIGN
130BA387.11
22-84/
22-87
22-83/
Par.:
Illustration 3.73 Speed at System Design
Working Point is not Known
[0]
*
Disabled Work point calculation not active. To be used if
speed at design point is known.
[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:
•
Parameter 22-83 Speed at No-Flow [RPM].
•
Parameter 22-84 Speed at No-Flow [Hz].
•
Parameter 22-87 Pressure at No-Flow
Speed.
•
Parameter 22-88 Pressure at Rated Speed.
•
Parameter 22-89 Flow at Design Point.
•
Parameter 22-90 Flow at Rated Speed.
22-83 Speed at No-Flow [RPM]
Range: Function:
Size
related*
[ 0 -
par.
22-85
RPM]
Resolution 1 RPM.
Enter the speed of the motor in RPM at
which îš…ow is 0 and minimum pressure H
MIN
is achieved. Alternatively, enter the speed in
Hz in parameter 22-84 Speed at No-Flow
[Hz]. If parameter 0-02 Motor Speed Unit is
set to RPM, parameter 22-85 Speed at Design
Point [RPM] should also be used. Closing
the valves and reducing the speed until
minimum pressure H
MIN
is achieved
determines this value.
22-84 Speed at No-Flow [Hz]
Range: Function:
Size
related*
[ 0 -
par.
Resolution 0.033 Hz.
22-84 Speed at No-Flow [Hz]
Range: Function:
22-86
Hz]
Enter the motor speed in Hz at which îš…ow
has eîš„ectively stopped and minimum
pressure H
MIN
is achieved. Alternatively,
enter the speed in RPM in
parameter 22-83 Speed at No-Flow [RPM]. If
parameter 0-02 Motor Speed Unit is set to
Hz, parameter 22-86 Speed at Design Point
[Hz] should also be used. Closing the valves
and reducing the speed until minimum
pressure H
MIN
is achieved determines this
value.
22-85 Speed at Design Point [RPM]
Range: Function:
Size
related*
[ 0 -
60000
RPM]
Resolution 1 RPM.
Only visible when parameter 22-82 Work
Point Calculation is set to [0] Disabled. Enter
the motor speed in RPM at which the
system design working point is achieved.
Alternatively, enter the speed in Hz in
parameter 22-86 Speed at Design Point [Hz].
If parameter 0-02 Motor Speed Unit is set to
RPM, parameter 22-83 Speed at No-Flow
[RPM] should also be used.
22-86 Speed at Design Point [Hz]
Range: Function:
Size
related*
[ 0.0 -
par.
4-19
Hz]
Resolution 0.033 Hz.
Only visible when parameter 22-82 Work
Point Calculation is set to [0] Disabled. Enter
the motor speed in Hz at which the system
design working point is achieved. Alterna-
tively, enter the speed in RPM in
parameter 22-85 Speed at Design Point [RPM].
If parameter 0-02 Motor Speed Unit is set to
Hz, parameter 22-83 Speed at No-Flow [RPM]
should also be used.
22-87 Pressure at No-Flow Speed
Range: Function:
0* [ 0 - par. 22-88 ] Enter the pressure H
MIN
corresponding to
speed at no-îš…ow in reference/feedback
units.
22-88 Pressure at Rated Speed
Also see parameter 22-82 Work Point Calculation.
Range: Function:
999999.999* [ par. 22-87 -
999999.999 ]
Enter the value corresponding
to the pressure at rated speed,
in reference/feedback units.
This value can be dened
using the pump datasheet.
Parameter Description Programming Guide
MG20OB02 Danfoss A/S © 05/2018 All rights reserved. 189
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