Danfoss VLT FC 103 Programming Manual page 123

Parameter Description
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
3 3
systems, where a faster control response is desirable.
21-02 PID Output Change
Range:
0.10 [0.01 -
*
0.50 ]
21-03 Minimum Feedback Level
Range:
-999999 [ -999999.999 -
*
par. 21-04 ]
21-04 Maximum Feedback Level
Range:
999999 [ par. 21-03 -
*
999999.999 ]
21-09 PID Autotuning
Option:
122
VLT
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:
The minimum allowable feedback
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:
The maximum allowable feedback
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] at the
end of tuning, this parameter is reset to
[0] Disabled.
MG16H102 - VLT
®
Refrigeration Drive Programming Guide
21-09 PID Autotuning
Option:
[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
External
Reference
P 21-13
Feedback
P 21-14
Illustration 3.42
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
[40] m/s
[41] m/min
®
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