Danfoss VLT Series Programming Manual page 141

Parameter Description
21-02 PID Output Change
Range:
0.10 [0.01 -
*
0.50 ]
3 3
21-03 Minimum Feedback Level
Range:
-999999.000
*
21-04 Maximum Feedback Level
Range:
999999.000
*
21-09 PID Autotuning
Option:
[0] Disabled
*
[1] Enabled Ext CL 1
PID
140
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:
[ -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
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.
MG.11.CC.02 - VLT
®
VLT HVAC Drive Programming Guide
21-09 PID Autotuning
Option:
[2] Enabled Ext CL 2
PID
[3] Enabled Ext CL 3
PID
3.19.2 21-1* Closed Loop 1 Ref/Feedback
External
Reference
P 21-13
Feedback
P 21-14
21-10 Ext. 1 Ref./Feedback Unit
Option:
[0] None
[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
[40] m/s
[41] m/min
[45] m
[60] °C
[70] mbar
[71] bar
[72] Pa
®
is a registered Danfoss trademark
Function:
FC
Ext.
Set
Closed
point
Loop
controller
P 21-15
1
MCB101
Function:
Select the unit for the reference and feedback.
Output
Signal
P 6-50
Output
Signal
P 6-60