Danfoss VLT AQUA Drive FC 202 Programming Manual page 145

Parameter Description
21-01 PID Performance
Option: Function:
[0] Normal Normal setting of this parameter is suitable for
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: Function:
0.10 [0.01 - This parameter sets the magnitude of step
*
0.50 ] 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.
21-03 Minimum Feedback Level
Range: Function:
-999999 [ -999999.999 Enter the minimum allowable
- par. 21-04 ] 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 or
parameter 21-50 Ext. 3 Ref./Feedback
Unit for EXT CL 3. If the level falls
below parameter 21-03 Minimum
Feedback Level, PID autotuning is
aborted and an error message appears
on the LCP.
21-04 Maximum Feedback Level
Range: Function:
999999 [ 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 or
parameter 21-50 Ext. 3 Ref./Feedback Unit
for EXT CL 3. If the level rises above
parameter 21-04 Maximum Feedback
Level, PID autotuning is aborted and an
error message appears on the LCP.
21-09 PID Auto Tuning
Option: 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
successfully completed and the settings
have been accepted or rejected by the
user, by pressing [OK] or [Cancel] at the
MG20O702
Programming Guide
21-09 PID Auto Tuning
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
External
Reference
P 21-13
Feedback
P 21-14
Illustration 3.53 Closed Loop 1 Ref/Feedback
21-10 Ext. 1 Ref./Feedback Unit
Option:
[0] -
[1] %
[5] PPM
[10] 1/min
[11] RPM
[12] Pulse/s
[20] l/s
[21] l/min
[22] l/h
[23] m³/s
[24] m³/min
[25] m³/h
[30] kg/s
[31] kg/min
[32] kg/h
[33] t/min
[34] t/h
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
Function:
end of tuning, this parameter is reset to
[0] Disabled.
FC
Ext.
Set
Closed
point
Loop
controller
P 21-15
1
MCB101
Function:
Select the unit for the reference and feedback.
3 3
Output
Signal
P 6-50
Output
Signal
P 6-60
143