Danfoss VLT Midi Drive FC 280 Programming Manual page 96

Parameter Descriptions
21-18 Ext. 1 Feedback [Unit]
Range:
0 ExtPID1Unit
*
21-19 Ext. 1 Output [%]
Range:
0 % [0 - 100 %] Return the extended closed loop 1 PID
*
4 4
21-20 Ext. 1 Normal/Inverse Control
Select [0] Normal if the controller output should be reduced
when the feedback is higher than the reference. Select [1] Inverse
if the output should be increased when the feedback is higher
than the reference.
Option:
[0]
*
[1]
21-21 Ext. 1 Proportional Gain
Range:
0.01 [0 - 10 ] The proportional gain indicates the number of
*
21-22 Ext. 1 Integral Time
Range:
10000 s [0.01 -
*
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
*
94
VLT
Function:
[-999999.999 - Return the feedback
999999.999 ExtPID1Unit] value.
Function:
controller output value.
Function:
Normal
Inverse
Function:
times the error between the setpoint and the
feedback signal is to be applied.
Function:
The integrator provides an increasing
gain at a constant error between the
setpoint and the feedback signal. The
integral time is the time needed by the
integrator to reach the same gain as the
proportional gain.
Function:
error. It only provides a gain when the error
changes. The quicker the error changes, the
stronger the gain from the differentiator.
Function:
increases 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.
Danfoss A/S © 07/2016 All rights reserved.
®
Midi Drive FC 280
MG07C302