Danfoss VLT AQUA Drive FC 200 Programming Manual page 144

Parameter Description
21-14 Ext. 1 Feedback Source
Option:
3 3
[0] No function
[1] Analog Input 53
[2] Analog Input 54
[3] Pulse input 29
[4] Pulse input 33
[7] Analog input X30/11
[8] Analog input X30/12
[9] Analog Input X42/1
[10] Analog Input X42/3
[11] Analog Input X42/5
[15] Analog Input X48/2
[100] Bus feedback 1
[101] Bus feedback 2
[102] Bus feedback 3
21-15 Ext. 1 Setpoint
Range:
0 ExtPID1Unit
*
21-17 Ext. 1 Reference [Unit]
Range:
0 ExtPID1Unit
*
21-18 Ext. 1 Feedback [Unit]
Range:
0 ExtPID1Unit
*
21-19 Ext. 1 Output [%]
Range:
0 % [0 - 100 %] Readout of the output value for the closed-
*
3-118
VLT
Function:
This parameter defines which input
on the adjustable frequency drive
should be treated as the source of
the feedback signal for the closed-
loop 1 controller. Analog input
X30/11 and Analog input X30/12
refer to inputs on the General
Purpose I/O.
Function:
[ par. 21-11 - par. The setpoint reference is
21-12 ExtPID1Unit] used in extended 1 closed-
loop. Ext.1 Setpoint is added
to the value from the Ext.1
Reference source selected in
21-13 Ext. 1 Reference Source.
Function:
[-999999.999 - Readout of the reference
999999.999 value for the closed-loop
ExtPID1Unit] 1 controller.
Function:
[-999999.999 - Readout of the feedback
999999.999 value for the closed-loop
ExtPID1Unit] 1 controller.
Function:
loop 1 controller.
MG20O622 - VLT
®
AQUA Drive Programming Guide
3.18.3 21-2* Closed-loop 1 PID
21-20 Ext. 1 Normal/Inverse Control
Option:
[0] Normal Select [0] Normal if the output should be reduced
[1] Inverse Select [1] Inverse if the output should be increased
21-21 Ext. 1 Proportional Gain
Range:
0.01 [0 - 10 ] The proportional gain indicates the number of
*
If (Error x Gain) jumps with a value equal to what is set in
3-03 Maximum Reference, the PID controller will try to
change the output speed equal to what is set in
4-13 Motor Speed High Limit [RPM]/4-14 Motor Speed High
Limit [Hz] but in practice of course limited by this setting.
The proportional band (error causing output to change
from 0‒100%) can be calculated by means of the formula:
(
1
Proportional Gain
NOTICE!
Always set the desired value for 3-03 Maximum Reference
before setting the values for the PID controller in
parameter group 20-9*.
21-22 Ext. 1 Integral Time
Range:
10000 s
*
21-23 Ext. 1 Differentation Time
Range:
0 s [0 - 10 s] The differentiator does not react to a constant
*
21-24 Ext. 1 Dif. Gain Limit
Range:
5 [1 - 50 ] Set a limit for the differentiator gain (DG). The DG
*
®
is a registered Danfoss trademark
Function:
when feedback is higher than the reference.
when feedback is higher than the reference.
Function:
times the error between the setpoint and the
feedback signal is to be applied.
)
× ( Max Reference )
[0.01 - 10000 s]
Function:
error. It only provides a gain when the feedback
changes. The quicker the feedback changes, the
stronger the gain from the differentiator.
Function:
will increase if there are fast changes. Limit the
DG to obtain a pure differentiator gain at slow
changes and a constant differentiator gain where
quick changes occur.
Function: