Danfoss VLT AQUA Drive FC 202 Programming Guide

Parameter used
Speed at design point
known
Speed at design point
unknown
Parameter 22-80 Flow Compensation + +
Parameter 22-81 Square-linear Curve Approximation + +
Parameter 22-82 Work Point Calculation + +
Parameter 22-83 Speed at No-Flow [RPM]/parameter 22-84 Speed at No-
Flow [Hz]
+ +
Parameter 22-85 Speed at Design Point [RPM]/parameter 22-86 Speed at
Design Point [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 – +
Table 3.30 Speed at Design Point Known/Unknown
22-80 Flow Compensation
Option: Function:
[0] * Disabled Setpoint compensation not active.
[1] Enabled Setpoint compensation is active. Enabling this
parameter allows the ow-compensated setpoint
operation.
22-81 Square-linear Curve Approximation
Range: Function:
100 %* [0 - 100 %]
NOTICE
Not visible when running in cascade.
Example 1
Adjustment of this parameter allows the
shape of the control curve to be adjusted.
0=Linear
100%=Ideal shape (theoretical).
Control Curve
(head)
(ow)
H
Q
130BA388.11
100%
P22-81 0%
Illustration 3.71 Square-Linear Curve Approximation
22-82 Work Point Calculation
Option: Function:
Example 1
A
130BA385.11
P22-85/22-86
Control Curve
H
MIN
H
DESIGN
Set Point
n
RATED
_
f
RATED
n
DESIGN
-
f
DESIGN
Q
(flow)
H
(head)
Par.:
22-83/
22-84/
22-87
Illustration 3.72 Speed at System Design
Working Point is Known
From the datasheet showing characteristics for the
specic equipment at dierent speeds, simply
reading across from the H
DESIGN
point and the
Q
DESIGN
point allows nding point A, which is the
system design working point. The pump character-
istics at this point should be identied and the
associated speed programmed. Closing the valves
and adjusting the speed until H
MIN
has been
achieved allows the speed at the no-ow point to
be identied.
Adjustment of parameter 22-81 Square-linear Curve
Approximation then allows the shape of the
control curve to be adjusted innitely.
Example 2
Speed at system design working point is not
known: Where the speed at system design
working point is unknown, another reference point
on the control curve has to be determined based
on the datasheet. Looking at the curve for the
rated speed and plotting the design pressure
(H
DESIGN
, Point C), the ow at that pressure, Q
RATED
,
can be determined. Similarly, by plotting the
design ow (Q
DESIGN
, Point D), the pressure H
DESIGN
Parameter Description
VLT
®
AQUA Drive FC 202
188 Danfoss A/S © 05/2018 All rights reserved. MG20OB02
33

Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English