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2 Parameter Description
20-72 PID Output Change
Range:
0.10*
[0.01 - 0.50 ]
2
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
2.17.5 20-8* PID Basic Settings
This parameter group is used to configure the basic operation of the frequency converter's PID Controller, including how it responds to a feedback that
is above or below the setpoint, the speed at which it first starts functioning, and when it will indicate that the system has reached the setpoint.
20-81 PID Normal/Inverse Control
Option:
[0] *
Normal
[1]
Inverse
20-82 PID Start Speed [RPM]
Range:
Application
[Application dependant]
dependent*
194
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Function:
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
par. 4-14
Motor Speed High Limit [Hz]
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.
Function:
Normal
[0] causes the frequency converter's output frequency to decrease when the feedback is
greater than the setpoint reference. This is common for pressure-controlled supply fan and pump
applications.
Inverse
[1] causes the frequency converter's output frequency to increase when the feedback is
greater than the setpoint reference.
Function:
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
Motor Speed High Limit [RPM]
is set to 50Hz, 0.10 is 10% of 50Hz, which is 5Hz. This
Minimum Feedback Level
Maximum Feedback Level
Programming Guide
/
,
,
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