Danfoss VLT AQUA Drive FC 200 Programming Manual page 142

Parameter Description
21-01 PID Performance
Option: Function:
[0] Normal Normal setting of this parameter will be suitable for
3 3
pressure control in fan systems.
[1] Fast Fast setting would generally be used in pumping
systems, where a faster control response is desirable.
21-02 PID Output Change
Range:
0.10 [0.01 -
*
0.50 ]
21-03 Minimum Feedback Level
Range:
-999999 [ -999999.999 -
*
par. 21-04 ]
21-04 Maximum Feedback Level
Range:
999999 [ par. 21-03 -
*
999999.999 ]
21-09 PID Autotuning
Option:
3-116
VLT
Function:
This parameter sets the magnitude of step
change during auto-tuning. The value is a
percentage of full operating range. This means
that if maximum analog output voltage is set
to 10 V, 0.10 is 10% of 10 V, which is 1 V. This
parameter should be set to a value resulting in
feedback changes of between 10% and 20%
for best tuning accuracy.
Function:
The minimum allowable feedback
level should be entered here in user
units as defined in 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL 1, 21-30 Ext.
2 Ref./Feedback Unit for EXT CL 2 or
21-50 Ext. 3 Ref./Feedback Unit for
EXT CL 3. If the level falls below
21-03 Minimum Feedback Level, PID
autotuning is aborted and an error
message will appear on the LCP.
Function:
The maximum allowable feedback
level should be entered here in user
units as defined in 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL 1, 21-30 Ext.
2 Ref./Feedback Unit for EXT CL 2 or
21-50 Ext. 3 Ref./Feedback Unit for EXT
CL 3. If the level rises above
21-04 Maximum Feedback Level, PID
autotuning is aborted and an error
message will appear on the LCP.
Function:
This parameter enables selection of the
Extended PID controller to be auto-tuned
and starts the PID auto-tuning for that
controller. Once the auto-tuning has
successfully completed and the settings
have been accepted or rejected by the
MG20O622 - VLT
®
AQUA Drive Programming Guide
21-09 PID Autotuning
Option:
[0] Disabled
[1] Enabled Ext CL1
PID
[2] Enabled Ext CL 2
PID
[3] Enabled Ext CL 3
PID
3.18.2 21-1* Closed-loop 1 Ref/Feedback
Figure 3.47
21-10 Ext. 1 Ref./Feedback Unit
Option:
[0] None
[1] %
[5] PPM
[10] min
[11] RPM
[12] PULSE/s
[20] liter / sec.
[21] liter / min
[22] liter / hr.
[23] m³ / sec.
[24] m³/min
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is a registered Danfoss trademark
Function:
user, by pressing [OK] or [Cancel] at the
end of tuning, this parameter is reset to
[0] Disabled.
Function:
Select the unit for the reference and
feedback.