Speed At No-Flow; Speed At Design Point - Danfoss VLT Programming Manual

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VLT HVAC Drive Programming Guide
[0] * Disabled
[1] Enabled
22-83 Speed at No-Flow [RPM]
Range:
Application [Application dependant]
dependent*
22-84 Speed at No-Flow [Hz]
Range:
Application [Application dependant]
dependent*
22-85 Speed at Design Point [RPM]
Range:
Application [Application dependant]
dependent*
(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
Speed at No-Flow [RPM]
par. 22-83
Flow Speed , par. 22-88 Pressure at Rated Speed
par. 22-90 Flow at Rated Speed .
Function:
Resolution 1 RPM.
The speed of the motor at which flow Is zero and minimum pressure H
entered here in RPM. Alternatively, the speed in Hz can be entered in par. 22-84
[Hz]
. If it has been decided to use RPM in par. 0-02
Design Point [RPM] should also be used. Closing the valves and reducing the speed until minimum
pressure H is achieved will determine this value.
MIN
Function:
Resolution 0.033 Hz.
The speed of the motor at which flow has effectively stopped and minimum pressure H
should be entered here in Hz. Alternatively, the speed in RPM can be entered in par. 22-83
at No-Flow [RPM] . If it has been decided to use Hz in par. 0-02
Speed at Design Point [Hz]
par. 22-86
speed until minimum pressure H
MIN
Function:
Resolution 1 RPM.
Work Point Calculation
Only visible when par. 22-82
which the System Design Working Point is achieved should be entered here in RPM. Alternatively,
the speed in Hz can be entered in par. 22-86
Motor Speed Unit
use RPM in par. 0-02
used.
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
3 Parameter Description
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. 22-84 , par. 22-87
, par. 22-89 Flow at Design Point
MIN
Motor Speed Unit
should also be used. Closing the valves and reducing the
is achieved will determine this value.
Disable
is set to . The speed of the motor at
Speed at Design Point [Hz]
Speed at No-Flow [RPM]
then par. 22-83
3
Pressure at No-
and
is achieved should be

Speed at No-Flow

Speed at
then par. 22-85
is achieved
MIN
Speed
Motor Speed Unit then
. If it has been decided to
should also be
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