Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 158

Parameter Description
NOTICE
When flow compensation is used with the cascade
controller (parameter group 25-** Cascade Pack
Controller), the actual setpoint does not depend on
speed (flow), but on the number of pumps cut in. See
3 3
Illustration 3.55:
H
DESIGN
Set Point
H
MIN
P22-87
Illustration 3.55 Number of Pumps
Parameter used
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 3.21 Number of Pumps
22-80 Flow Compensation
Option:
[0] Disabled Setpoint compensation not active.
*
[1] Enabled Setpoint compensation is active. Enabling this
156
VLT
H
(head)
1 2
Number of pumps
Function:
parameter allows the flow-compensated setpoint
operation.
Danfoss A/S © 05/2016 All rights reserved.
®
Refrigeration Drive FC 103
There are 2 methods which can be employed, depending
on whether or not the speed at system design working
point is known.
3
Speed at
design point
KNOWN
+
+
+
+
+
+
–
–
–
22-81 Square-linear Curve Approximation
Range:
100 % [0 -
*
100 %]
Speed at
design point Cascade controller
UNKNOWN
+
+
+
+
–
+
+
+
+
Function:
NOTICE
Not visible when running in pack
control mode.
Example 1
Adjustment of this parameter allows the
shape of the control curve to be adjusted.
0 = Linear
100% = Ideal shape (theoretical).
+
–
–
–
–
+
–
–
–
MG16H202