Danfoss VLT FC 100 Series Programming Manual page 169

Parameter Description
22-82 Work Point Calculation
Option:
3 3
[0] Disabled Work Point Calculation not active. To be used if
*
[1] Enabled Work Point Calculation is active. Enabling this
22-83 Speed at No-Flow [RPM]
Range:
Size [ 0 - par.
related 22-85
*
RPM]
22-84 Speed at No-Flow [Hz]
Range:
Size [
related par.
*
22-86 Hz]
3-142
Function:
pump curve, along with H as described above,
MIN
allows the Adjustable frequency drive 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)
D B
H RATED
P22-88
A
C
H DESIGN
Setpoint
H MIN
P22-83/
P22-84 Control Curve
P22-87
Q DESIGN Q RATED Q
P22-89 P22-90
Figure 3.58
speed at design point is known (see ).
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.
Function:
Resolution 1 RPM.
The speed of the motor at which the flow
is zero and the 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.
Function:
0.0 - Resolution 0.033 Hz.
The speed of the motor at which flow has
effectively stopped and minimum
pressure H is achieved should be
MIN
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
MG11CD22 - VLT
®
VLT HVAC Drive Programming Guide
22-84 Speed at No-Flow [Hz]
Range:
22-85 Speed at Design Point [RPM]
Range:
Size
related
*
22-86 Speed at Design Point [Hz]
Range:
Size
related
*
is
MIN
22-87 Pressure at No-Flow Speed
Range:
0.000
*
is
MIN
Please also see 22-82 Work Point Calculation point D.
22-88 Pressure at Rated Speed
Range:
999999.999
® is a registered Danfoss trademark
Function:
Point [Hz] should also be used. Closing
the valves and reducing the speed until
minimum pressure H
determine this value.
Function:
[ par. Resolution 1 RPM.
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.
Function:
[ par. Resolution 0.033 Hz.
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.
Function:
[ 0.000 - par. Enter the pressure H
22-88 ]
corresponding to Speed at No Flow
in Reference/Feedback Units.
Function:
[ par. 22-87 - Enter the value corresponding
*
999999.999 ] to the Pressure at Rated
Speed, in Reference/Feedback
Units. This value can be
defined using the pump
datasheet.
is achieved will
MIN
MIN