Danfoss VLT FC 100 Series Programming Manual page 151

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:
-999999.000
*
21-04 Maximum Feedback Level
Range:
999999.000
*
21-09 PID Autotuning
Option:
3-124
Function:
This parameter sets the magnitude of step
change during autotuning. 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:
[ -999999.999 The minimum allowable feedback
- par. 21-04 ] 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:
[ par. 21-03 - The maximum allowable feedback
999999.999 ] 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 autotuned
and starts the PID autotuning for that
controller. Once the autotuning has
MG11CD22 - VLT
®
VLT HVAC Drive Programming Guide
21-09 PID Autotuning
Option:
[0] Disabled
*
[1] Enabled Ext CL 1
PID
[2] Enabled Ext CL 2
PID
[3] Enabled Ext CL 3
PID
3.19.2 21-1* Closed-loop 1 Ref/Feedback
Figure 3.48
21-10 Ext. 1 Ref./Feedback Unit
Option:
[0]
[1] %
*
[5] PPM
[10] min
[11] RPM
[12] PULSE/s
[20] liter / sec.
[21] liter / min
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Function:
successfully completed and the settings
have been accepted or rejected by the
user, by pressing [OK] or [Cancel]
buttons on the LCP at the end of
tuning, this parameter is reset to [0]
Disabled.
Function:
Select the unit for the reference and
feedback.