Danfoss VLT Refrigeration Drive FC 103 Programming Manual page 140

Parameter Description
21-00 Closed Loop Type
Option:
3 3
[0] Auto
*
[1] Fast Pressure
[2] Slow Pressure
[3] Fast
Temperature
[4] Slow
Temperature
21-01 PID Performance
Option:
[0] Normal Normal setting of this parameter is suitable for
*
[1] Fast
21-02 PID Output Change
Range:
0.10 [0.01 -
*
0.50]
21-03 Minimum Feedback Level
Range:
-999999
*
[ -999999.999
- par. 21-04]
138
Function:
This parameter defines the application
response. The default mode should be
sufficient for most applications. If the
relative application speed is known, it
can be selected here. This decreases the
time needed for carrying out PID auto
tuning. The setting has no impact on the
value of the tuned parameters and is
used only for the PID auto tuning
sequence.
Function:
pressure control in fan systems.
Fast setting would generally be used in pumping
systems, where a faster control response is
desirable.
Function:
This parameter sets the magnitude of step
change during auto tuning. The value is a
percentage of full operating range. That is, if the
maximum analog output voltage is set to 10 V,
0.10 is 10% of 10 V, which is 1 V. Set this
parameter to a value resulting in feedback
changes of 10–20% for best tuning accuracy.
Function:
Enter the minimum allowable feedback
level in user units as defined in:
•
Parameter 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL 1.
•
Parameter 21-30 Ext. 2 Ref./
Feedback Unit for EXT CL 2.
•
Parameter 20-05 Feedback 2
Source Unit for EXT CL 3.
If the level drops below
parameter 21-03 Minimum Feedback
Level, PID auto tuning is aborted, and
an error message appears in the
display.
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®
VLT Refrigeration Drive FC 103
21-04 Maximum Feedback Level
Range:
999999
*
21-09 PID Autotuning
Option:
[0] Disabled
*
[1] Enabled Ext CL1
PID
[2] Enabled Ext CL
2 PID
[3] Enabled Ext CL
3 PID
Function:
[ par. 21-03 Enter the maximum allowable feedback
- level in user units as defined in:
•
999999.999] Parameter 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL 1.
•
Parameter 21-30 Ext. 2 Ref./
Feedback Unit for EXT CL 2.
•
Parameter 20-05 Feedback 2
Source Unit for EXT CL 3.
If the level rises above
parameter 21-04 Maximum Feedback Level,
PID auto tuning is aborted, and an error
message appears in the display.
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
pressing [OK] or [Cancel] at the end of
tuning, this parameter is reset to [0]
Disabled.
MG16H202