Danfoss vlt FC 102 Programming Guide

Parameter used
Speed at
design point
KNOWN
Speed at
design point
UNKNOWN
Cascade controller
Parameter 22-80 Flow Compensation + + +
Parameter 22-81 Square-linear Curve Approxi-
mation
+ + –
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 3.27 Number of Pumps
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 3.63 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 3.64 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 characteristics 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.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
210 Danfoss A/S © 10/2019 All rights reserved. M0010001
33

Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English