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2 Parameter Description
21-00 Closed Loop Type
Option:
2
[0] *
Auto
[1]
Fast Pressure
[2]
Slow Pressure
[3]
Fast Temperature
[4]
Slow Temperature
21-02 PID Output Change
Range:
0.10*
[0.01 - 0.50 ]
21-03 Minimum Feedback Level
Range:
-999999.00
[Application dependant]
0*
21-04 Maximum Feedback Level
Range:
999999.000
[Application dependant]
*
21-01 PID Performance
Option:
[0] *
Normal
[1]
Fast
198
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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 will decrease
the time needed for carrying out PID Autotuning. The setting has no impact on the value of the
tuned parameters and is used only for the PID auto-tuning sequence.
Function:
This parameter sets the magnitude of step change during autotuning. The value is a percentage of
full operating range. I.e. 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
Ext. 1 Ref./Feedback Unit
par. 21-10
for EXT CL 1, par. 21-30
2 or par. 21-50
Ext. 3 Ref./Feedback Unit
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
Ext. 1 Ref./Feedback Unit
par. 21-10
for EXT CL 1, par. 21-30
2 or par. 21-50
Ext. 3 Ref./Feedback Unit
Feedback Level
, PID autotuning is aborted and an error message will appear on the LCP.
Function:
Normal setting of this parameter will be suitable for pressure control in fan systems.
Fast setting would generally be used in pumping systems, where a faster control response is de-
sirable.
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
Ext. 2 Ref./Feedback Unit
for EXT CL 3. If the level falls below par. 21-03
Ext. 2 Ref./Feedback Unit
for EXT CL 3 If the level rises above par. 21-04
Programming Guide
for EXT CL
Minimum
for EXT CL
Maximum
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