Danfoss VLT CDS 303 User Manual

7-38 Process PID Feed Forward Factor
Range: Function:
0 %* [0 -
200 %]
Enter the PID feed forward (FF) factor. The FF
factor sends a constant fraction of the reference
signal to bypass the PID control, so the PID
control only aects the remaining fraction of the
control signal. Any change to this parameter will
thus aect the motor speed. When the FF factor
is activated it provides less overshoot, and high
dynamics when changing the set point.
parameter 7-38 Process PID Feed Forward Factor is
active when parameter 1-00 Conguration Mode
is set to [3] Process.
7-39 On Reference Bandwidth
Range: Function:
5 %* [0 -
200 %]
Enter the On Reference bandwidth. When the
PID Control Error (the dierence between the
reference and the feedback) is less than the set
value of this parameter the On Reference
status bit is high, i.e. =1.
6.8.2 7-6* Feedback Conversion
Select how the signals from the feedback sources must be
converted.
7-60 Feedback 1 Conversion
Option: Function:
Selects the conversion to apply to the
feedback signal measured on the analog
input selected as feedback 1 source in 7-20
Process CL Feedback 1 Resource.
[0]
*
Linear No conversion is applied. The feedback
signal is assumed to be in the unit selected
in 3-01 Reference/Feedback Unit and enters
the process controller unchanged.
[1] Square root The square root of the feedback signal is
calculated before passing it to the process
controller.
[2] Pressure to
temperature
The feedback signal is a pressure with units
as specied in 7-61 Feedback 1 Source Unit.
It is converted to a temperature before
passing it to the process controller. The
pressure to temperature conversion is based
on the refrigerant selected in 7-70
Refrigerant.
7-61 Feedback 1 Source Unit
Option: Function:
Select the pressure unit applicable to feedback
source 1 dened in 7-20 Process CL Feedback 1
Resource.
7-61 Feedback 1 Source Unit
Option: Function:
[70] mbar
[71] bar
[72] Pa
[73] kPa
[74] m WG
[170]
[171]
psi
lb/in2
[172] in WG
[173] ft WG
7-62 Feedback 2 Conversion
Option: Function:
Selects the conversion to apply to the
feedback signal measured on the analog
input selected as feedback 2 source in 7-22
Process CL Feedback 2 Resource.
[0]
*
Linear No conversion is applied. The feedback
signal is assumed to be in the unit selected
in 3-01 Reference/Feedback Unit and enters
the process controller unchanged.
[1] Square root The square root of the feedback signal is
calculated before passing it to the process
controller.
[2] Pressure to
temperature
The feedback signal is a pressure with units
as specied in 7-62 Feedback 2 Source Unit.
It is converted to a temperature before
passing it to the process controller. The
pressure to temperature conversion is based
on the refrigerant selected in 7-70
Refrigerant.
7-63 Feedback 2 Source Unit
Option: Function:
Select the pressure unit applicable to feedback
source 1 dened in 7-22 Process CL Feedback 2
Resource.
[70] mbar
[71] bar
[72] Pa
[73] kPa
[74] m WG
[170]
[171]
psi
lb/in2
[172] in WG
[173] ft WG
Parameter Descriptions
VLT
®
Compressor Drives CDS 302/CDS 303
78 Danfoss A/S © Rev. 2013-07-03 All rights reserved. MG34M422
6
6

Danfoss VLT CDS 303 Specifications

General

Brand	Danfoss
Model	VLT CDS 303
Category	DC Drives
Language	English