NB!
Does not work in cascade mode.
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
DESIGN
(Required pressure) is the setpoint for closed loop (PI) operation of the frequency converter and is set as for closed loop operation without flow
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
Parameter
number
Speed at
Design Point
KNOWN
Speed at
Design Point
UNKNOWN
Flow Compensation
(Par 22-80)
+
+
Square-Linear Curve Approximation
(Par 22-81)
+
+
Work Point Calculation
(Par 22-82)
+
+
Speed at No Flow
(Par 22-83/84)
+
+
Speed at Design Point
(Par 22-85/86)
+
-
Pressure at No Flow
(Par 22-87)
+
+
Pressure at Rated Speed
(Par 22-88)
-
+
Flow at Design Point
(Par 22-89)
-
+
Flow at Rated Speed
(Par 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.
2 Parameter Description
VLT
p
Automation VT Drive FC322
Programming Guide
222
MG.20.W1.22 - VLT
p
is a registered Danfoss trademark
2
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20772-Danfoss-131X8135-VLT-Automation-VT-Drive-VFD-FC322-230V-5-HP.aspx