20-23 Setpoint 3
Range: Function:
0.000 Proc-
essCtrlU-
nit*
[-999999.999 - 999999.999 Proc-
essCtrlUnit]
Setpoint 3 is used in Closed Loop Mode to enter a setpoint reference that may be used by the
frequency converter’s PID Controller. See the description of par.20-20
Feedback Function
.
NB!
The setpoint reference entered here is added to any other references that are
enabled (see par. group 3-1*).
20-25 Setpoint Type
Fixed setpoint will disable the possibility to accept Po optimization offset via the bus. Fixed with night setback disables also Po optimization, but allows
night setback as defined in par. 28-73. Floating enables Po optimization via bus, but disables night setback functions.
Option: Function:
[0] * Fixed
[1] Fixed with night setback
[2] Floating
3.15.4 20-3* Feedback Adv. Conversion
In air conditioning compressor applications it is often useful to control the system based on the temperature of the refrigerant. However, it is generally
more convenient to directly measure its pressure. This parameter group allows the frequency converter’s PID Controller to convert refrigerant pressure
measurements into temperature values.
20-30 Refrigerant
Select the refrigerant used in the compressor application. This parameter must be specified correctly for the pressure to temperature conversion to
be accurate. If the refrigerant used is not listed in choices [0] through [6], select
User defined
[7]. Then, use par. 20-31, 20-32 and 20-33 to provide
A1, A2 and A3 for the equation below:
Temperature
=
A
2
(
ln
(
Pe
+1
)
−
A
1
)
−
A
3
Option: Function:
[0] * R user
[1] R12
[2] R22
[3] R134a
[4] R502
[5] R717
[6] R13
[7] R13b1
[8] R23
[9] R500
[10] R503
[11] R114
[12] R142b
[14] R32
[15] R227
[16] R401A
[17] R507
[18] R402A
[19] R404A
ADAP-KOOL
®
Drive Programming Guide 3 Parameter Description
MG.11.N1.02 - VLT
®
is a registered Danfoss trademark
151
3
To Next Page
Loading...
Need help?
General