21-01 PID Performance
Option:
Function:
[0] Normal Normal setting of this parameter will be 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 -
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
*
[ -999999.999 -
par. 21-04 ]
The minimum allowable feedback
level should be entered here in User
Units as defined in
for EXT CL 1,
for EXT CL 2 or
21-50 Ext. 3 Ref./Feedback Unit
for
EXT CL 3. If the level falls below
, PID
autotuning is aborted and an error
message will appear on the LCP.
21-04 Maximum Feedback Level
Range:
Function:
999999
*
[ par. 21-03 -
999999.999 ]
The maximum allowable feedback
level should be entered here in User
units as defined in
for EXT CL 1,
for EXT CL 2 or
21-50 Ext. 3 Ref./Feedback Unit
for EXT
CL 3 If the level rises above
, 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] at the
end of tuning, this parameter is reset to
[0] Disabled
.
21-09 PID Autotuning
Option:
Function:
[0]
*
Disabled
[1]
Enabled Ext CL1
PID
[2]
Enabled Ext CL 2
PID
[3]
Enabled Ext CL 3
PID
3.16.3 21-1* Closed Loop 1 Ref/Feedback
FC
MCB101
130BA355.11
External
Reference
Set
point
Feedback
Output
Signal
Ext.
Closed
Loop
controller
1
Output
Signal
P 21-13
P 21-14
P 21-15
P 6-60
P 6-50
Illustration 3.42
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]
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
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
122
MG16H102 - VLT
®
is a registered Danfoss trademark
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