NB!
When flow compensation is used with the Cascade Controller (parameter group 25-**), the actual set-point will not depend on speed
(flow) but on the number of pumps cut in. See below:
There are two 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
Flow Compensation, 22-80 + + +
Square-Linear Curve Approximation, 22-81 + + -
Work Point Calculation, 22-82 + + -
Speed at No Flow, 22-83/84 + + -
Speed at Design Point, 22-85/86 + - -
Pressure at No Flow, 22-87 + + +
Pressure at Rated Speed, 22-88 - + -
Flow at Design Point, 22-89 - + -
Flow at Rated Speed, 22-90 - + -
22-80 Flow Compensation
Option: Function:
[0] * Disabled [0]
Disabled
: Set-Point compensation not active.
[1] Enabled [1]
Enabled
:Set-Point compensation is active. Enabling this parameter allows the Flow Compensated
Setpoint operation.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
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