setting has no impact on the value of the tuned parameters and
is used only for the PID Auto-tuning sequence.
21-02 PID Output Change
Range: Function:
0.10
*
[0.01 - 0.50] This parameter sets the magnitude of step change during auto-
tuning. 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.
21-03 Minimum Feedback Level
Range: Function:
-999999
.999
User
Units
*
[-999999.999 - Value
of par. 21-04]
The minimum allowable feedback level should be entered here
in User Units as defined in par 21-10 for EXT CL 1, par 21-30 for
EXT CL 2 or par 21-50 for EXT CL 3. If the level falls below par
21-03, PID Auto-tuning is aborted and an error message will
appear on the LCP.
21-04 Maximum Feedback Level
Range: Function:
999999.
999
User
Units
*
[Value of par. 21-03 -
999999.999]
The maximum allowable feedback level should be entered here
in User units as defined in par 21-10 for EXT CL 1, par 21-30 for
EXT CL 2 or par 21-50 for EXT CL 3 If the level rises above par
21-04, PID Auto-tuning is aborted and an error message will
appear on the LCP.
21-01 PID Performance
Option: Function:
[0]
*
Normal
[1] Fast
Normal
[0]: Parameter is suitable for pressure control in fan
systems, especially where the pressure sensor may be some
distance from the fan.
Fast
[1]: Setting generally used in pumping systems, where a
faster control response is desirable.
21-05 PID Auto-Tuning
Option: Function:
[0]
*
Disabled
[1] Enabled Ext PID 1
[2] Enabled Ext PID 2
VLT
®
AQUA Drive Programming Guide 2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
187
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