Danfoss ADAP-KOOL Drive Programming Manual page 162

3 Parameter Description
21-18 Ext. 1 Feedback [Unit]
Range:
0.000 Ex- [-999999.999 - 999999.999 Ex-
tPID1Unit* tPID1Unit]
21-19 Ext. 1 Output [%]
Range:
3
0 %* [0 - 100 %]
3.16.4 21-2* Closed Loop 1 PID
Configure the Closed Loop 1 PID controller.
21-20 Ext. 1 Normal/Inverse Control
Option:
[0] * Normal
[1] Inverse
21-21 Ext. 1 Proportional Gain
Range:
0.01 N/A* [0.00 - 10.00 N/A]
If (Error x Gain) jumps with a value equal to what is set in par. , the PID controller will try to change the output speed equal to what is set in par.
4-13/4-14, Motor Speed High Limit, 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
NB!
Always set the desired for par. before setting the values for the PID controller in par. group 20-9*.
21-22 Ext. 1 Integral Time
Range:
10000.00 [0.01 - 10000.00 s]
s*
21-23 Ext. 1 Differentation Time
Range:
0.00 s* [0.00 - 10.00 s]
162
Function:
Readout of the feedback value for the Closed Loop 1 Controller.
Function:
Readout of the output value for the Closed Loop 1 Controller.
Function:
Normal
Select
Select Inverse
Function:
Max Reference )
Function:
Over time, the integrator accumulates a contribution to the output from the PID controller as long
as there is a deviation between the Reference/Setpoint and feedback signals. The contribution is
proportional to the size of the deviation. This ensures that the deviation (error) approaches zero.
Quick response on any deviation is obtained when the integral time is set to a low value. Setting it
too low, however, may cause the control to become unstable.
The value set, is the time needed for the integrator to add the same contribution as the proportional
part for a certain deviation.
If the value is set to 10,000, the controller will act as a pure proportional controller with a P-band
based on the value set in par.20-93
from the proportional controller will be 0.
Function:
The differentiator does not react to a constant error. It only provides a gain when the feedback
changes. The quicker the feedback changes, the stronger the gain from the differentiator.
MG.11.N1.02 - VLT
ADAP-KOOL
[0] if the output should be reduced when feedback is higher than the reference.
[1] if the output should be increased when feedback is higher than the reference.
PID Proportional Gain
® is a registered Danfoss trademark
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Drive Programming Guide
. When no deviation is present, the output