Operating instructions

21-02 PID Output Change
Range: Function:
0.10 * [0.01 -
0.50 ]
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.
21-03 Minimum Feedback Level
Range: Function:
-999999.000 * [Applica-
tion
depend-
ant]
The minimum allowable feedback level
should be entered here in User Units as
defined in par. 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL 1,
par. 21-30 Ext. 2 Ref./Feedback Unit for
EXT CL 2 or par. 21-50 Ext. 3 Ref./
Feedback Unit for EXT CL 3. If the level
falls below par. 21-03 Minimum
Feedback Level, PID autotuning is
aborted and an error message will
appear on the LCP.
21-04 Maximum Feedback Level
Range: Function:
999999.000 * [Applica-
tion
depend-
ant]
The maximum allowable feedback level
should be entered here in User units as
defined in par. 21-10 Ext. 1 Ref./Feedback
Unit for EXT CL 1, par. 21-30 Ext. 2 Ref./
Feedback Unit for EXT CL 2 or
par. 21-50 Ext. 3 Ref./Feedback Unit for
EXT CL 3 If the level rises above
par. 21-04 Maximum Feedback Level, PID
autotuning is aborted and an error
message will appear on the LCP.
21-09 PID Autotuning
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] buttons
on the LCP at the end of tuning, this
parameter is reset to [0] Disabled.
[0]
* Disabled
[1] Enabled Ext CL 1
PID
[2] Enabled Ext CL 2
PID
21-09 PID Autotuning
Option: Function:
[3] Enabled Ext CL 3
PID
3.19.2 21-1* Closed Loop 1 Ref/Feedback
21-10 Ext. 1 Ref./Feedback Unit
Option: Function:
Select the unit for the reference and feedback.
[0]
[1]
* %
[5] PPM
[10] 1/min
[11] RPM
[12] Pulse/s
[20] l/s
[21] l/min
[22] l/h
[23] m/s
[24] m/min
[25] m/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
[73] kPa
[74] m WG
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 133
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