Danfoss VLT DriveMotor FCP 106 Programming Manual page 114

Parameters
22-82 Work Point Calculation
Option:
4 4
[0] Disabled Work point calculation not active. To be used if
*
[1] Enabled Work point calculation is active. Enabling this
22-84 Speed at No-Flow [Hz]
Range:
0 Hz [ 0 -
*
400.0
Hz]
112
Function:
pressure H at that flow can be determined.
DESIGN
Knowing these 2 points on the pump curve, along
with H as described above, allows the
MIN
frequency converter to calculate the reference
point B and thus to plot the control curve, which
also includes the system design working point A.
H (head)
H
RATED
D
Par.
B
A
22-88
C
H
DESIGN
Set point
H
MIN
Par.:
22-83/
Control Curve
22-84/
22-87
Q Q
Q
DESIGN RATED
(flow)
Par. Par.
22-90
22-89
Illustration 4.23 Speed at System Design
Working Point is not Known
speed at design point is known.
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.
Function:
Resolution 0.033 Hz.
Enter the motor speed in Hz at which flow has
effectively stopped and minimum pressure H
is achieved. Alternatively, enter the speed in
RPM in parameter 22-83 Speed at No-Flow [RPM].
If it has been decided to use Hz in
parameter 0-02 Motor Speed Unit,
parameter 22-86 Speed at Design Point [Hz]
should also be used. Closing the valves and
reducing the speed until minimum pressure
H is achieved determines this value.
MIN
Danfoss A/S © 11/2015 All rights reserved.
®
VLT DriveMotor FCP 106/FCM 106
22-86 Speed at Design Point [Hz]
Range:
Size
related
*
22-87 Pressure at No-Flow Speed
Range:
0 [ 0 - 999999.999 ] Enter the pressure H
*
22-88 Pressure at Rated Speed
Range:
999999.999
See parameter 22-88 Pressure at Rated Speed point A.
22-89 Flow at Design Point
Range:
0 [0 - 999999.999 ]
*
22-90 Flow at Rated Speed
Also see parameter 22-82 Work Point Calculation.
Range:
0 [0 - 999999.999 ] Enter the value corresponding to flow at
*
MIN
Function:
[ 0.0 - Resolution 0.033 Hz.
400.0
Only visible when parameter 22-82 Work
Hz]
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 it has been decided to use Hz in
parameter 0-02 Motor Speed Unit,
parameter 22-83 Speed at No-Flow [RPM]
should also be used.
Function:
speed at no-flow in reference/feedback
units.
Function:
[ 0 - Enter the value corresponding to
*
999999.999 ] the pressure at rated speed, in
reference/feedback units. This
value can be defined using the
pump datasheet.
Function:
Flow at design point (no units).
Function:
rated speed. This value can be defined
using the pump datasheet.
corresponding to
MIN
MG03N202