Danfoss VLT HVAC Drive FC 102, Programming Manual, Page: 172 / 250

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
Illustration 3.56 :
Set Point
P22-87
Number of pumps
H
(head)
H
DESIGN
H
MIN
130BA547.10
2 1 3
Illustration 3.56 Number of Pumps
There are 2 methods which can be employed, depending
upon whether or not the speed at system design working
point is known.
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 3.25 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 flow-compensated setpoint
operation.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
170 Danfoss A/S © 03/2015 All rights reserved. MG11CE02
3 3