Danfoss VLT HVAC Series User Manual

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 : Setpoint compensation not active.
[1] Enabled [1]
Enabled : Setpoint compensation is active. Enabling this parameter allows the Flow Compensated
Setpoint operation.
22-81 Square-linear Curve Approximation
Range: Function:
100 %* [0 - 100 %] Example 1:
Adjustment of this parameter allows the shape of the control curve to be adjusted.
0 = Linear
100% = Ideal shape (theoretical).
NOTE!
Please note: Not visible when running in cascade.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
3-208 MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage