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2 Parameter Description
NB!
Does not work in cascade mode.
2
2.19.8 22-8* Flow Compensation
It is sometimes the case that is not possible for a pressure transducer to be placed at a remote point in the system and it can only be located close to
the fan/pump outlet. Flow compensation operates by adjusting the set-point according to the output frequency, which is almost proportional to flow, thus
compensating for higher losses at higher flow rates.
H
(Required pressure) is the setpoint for closed loop (PI) operation of the frequency converter and is set as for closed loop operation without flow
DESIGN
compensation.
There are two methods which can be employed, depending upon whether or not the Speed at System design Working Point is known.
Parameter used
Flow Compensation
Square-Linear Curve Approximation
Work Point Calculation
Speed at No Flow
Speed at Design Point
Pressure at No Flow
Pressure at Rated Speed
Flow at Design Point
Flow at Rated Speed
22-80 Flow Compensation
Option:
[0] *
Disabled
[1]
Enabled
222
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Parameter
number
(Par 22-80)
(Par 22-81)
(Par 22-82)
(Par 22-83/84)
(Par 22-85/86)
(Par 22-87)
(Par 22-88)
(Par 22-89)
(Par 22-90)
Function:
Disabled
[0]
: Set-Point compensation not active.
[1]
Enabled
:Set-Point compensation is active. Enabling this parameter allows the Flow Compensated
Setpoint operation.
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
Programming Guide
Speed at
Speed at
Design Point
Design Point
KNOWN
UNKNOWN
+
+
+
+
+
+
+
+
+
-
+
+
-
+
-
+
-
+
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