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7 How to Program the Adjustable Frequency
Drive
20-70 Closed-loop Type
Option:
[0] *
Auto
[1]
Fast Pressure
[2]
Slow Pressure
[3]
Fast Temperature
[4]
Slow Temperature
20-71 PID Performance
Option:
[0] *
Normal
[1]
Fast
7
20-72 PID Output Change
Range:
0.10 N/A*
[0.01 - 0.50 N/A]
20-73 Minimum Feedback Level
Range:
-999999.00
[Application dependant]
0
Proc-
essCtrlU-
nit*
20-74 Maximum Feedback Level
Range:
999999.000
[Application dependant]
ProcessCtr-
lUnit*
20-79 PID Autotuning
Option:
[0] *
Disabled
[1]
Enabled
7-40
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.
Function:
Normal setting of this parameter will be suitable for pressure control in fan systems.
Fast setting would generally be used in pumping systems, where a faster control response is de-
sirable.
Function:
This parameter sets the magnitude of step change during autotuning. The value is a percentage of
full speed. This means that if the maximum output frequency inpar. 4-13
[RPM]
Motor Speed High Limit [Hz]
/par. 4-14
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
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.
Function:
The maximum allowable feedback level should be entered here in user units as defined in
Reference/Feedback Unit
par. 20-12
. If the level rises above par. 20-74
autotuning is aborted and an error message will appear on the LCP.
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.
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
VLT
®
HVAC Drive Instruction Manual
Motor Speed High Limit
is set to 50 Hz, 0.10 is 10% of 50 Hz, which is 5 Hz.
Minimum Feedback Level
Maximum Feedback Level
,
,
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