20-70 Closed Loop Type
Option:
Function:
This parameter defines the application response. The default mode should be sufficient for most
applications. If the application response speed is known, it can be selected here. This will decrease
the time needed for carrying out PID autotuning. The setting has no impact on the value of the
tuned parameters and is used only for the autotuning sequence.
[0] *
Auto
[1]
Fast Pressure
[2]
Slow Pressure
[3]
Fast Temperature
[4]
Slow Temperature
2.17.5 20-79 PID Autotuning
20-79 PID Autotuning
Option:
Function:
Select the relative response speed for the application.
[0] *
Disabled
[1]
Enabled
20-72 PID Output Change
Range:
Function:
0.10 N/A* [0.01 - 0.50 N/A]
This parameter sets the magnitude of step change during autotuning. The value is a percentage of
full speed. I.e. if maximum output frequency inpar.4-13
is set to 50Hz, 0.10 is 10% of 50Hz, which is 5Hz. This parameter
should be set to a value resulting in feedback changes of between 10% and 20% for best tuning
accuracy.
20-73 Minimum Feedback Level
Range:
Function:
-999999.00
0 Proc-
essCtrlU-
nit*
[-999999.999 - par. 20-74 Proc-
essCtrlUnit]
The minimum allowable feedback level should be entered here in User units as defined in
par. 20-12
Reference/Feedback Unit
. If the level falls below par.20-73
autotuning is aborted and an error message will appear on the LCP.
20-74 Maximum Feedback Level
Range:
Function:
999999.000
ProcessCtr-
lUnit*
[par. 20-73 - 999999.999 Proc-
essCtrlUnit]
The maximum allowable feedback level should be entered here in User units as defined in
par. 20-12
Reference/Feedback Unit
. If the level rises above par.20-74
autotuning is aborted and an error message will appear on the LCP.
20-79 PID Autotuning
Option:
Function:
This parameter starts the PID autotuning sequence. 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
VLT
®
AQUA Drive Programming Guide
2 Parameter Description
MG.20.O4.02 - VLT
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