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VLT Automation VT Drive FC322
Programming Guide
20-83 PID Start Speed [Hz]
Range:
Application
[Application dependant]
dependent*
20-84 On Reference Bandwidth
Range:
5 %*
[0 - 200 %]
2.17.6 20-9* PID Controller
This group provides the ability to manually adjust this PID Controller. By adjusting the PID Controller parameters the control performance may be
improved. See section on
on adjusting the PID Controller parameters.
20-91 PID Anti Windup
Option:
[0]
Off
[1] *
On
20-93 PID Proportional Gain
Range:
2.00*
[0.00 - 10.00 ]
If (Error x Gain) jumps with a value equal to what is set in par. 20-14
equal to what is set in par. 4-13
The proportional band (error causing output to change from 0-100%) can be calculated by means of the formula:
(
)
1
× (
Proportional Gain
NB!
Always set the desired for par. 20-14
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Function:
Function:
When the difference between the feedback and the setpoint reference is less than the value of this
parameter, the frequency converter's display will show "Run on Reference". This status can be
communicated externally by programming the function of a digital output for
Warning
[8]. In addition, for serial communications, the On Reference status bit of the frequency
converter's Status Word will be high (1).
The
On Reference Bandwidth
PID
Introduction to VLT Automation VT Drive
in the chapter
Function:
Off
[0] The integrator will continue to change value also after output has reached one of the ex-
tremes. This can afterwards cause a delay of change of the output of the controller.
On
[1] The integrator will be locked if the output of the built in PID controller has reached one of
the extremes (min or max value) and therefore not able to add further change to the value of the
process parameter controlled. This allows the controller to respond more quickly when it again can
control the system.
Function:
Motor Speed High Limit [RPM]
/par. 4-14
)
Max Reference
Maximum Reference/Feedb.
MG.20.W1.22 - VLT is a registered Danfoss trademark
is calculated as a percentage of the setpoint reference.
in the VLT Automation VT Drive Design Guide for guidelines
Maximum Reference/Feedb.
the PID controller will try to change the output speed
Motor Speed High Limit [Hz]
but in practice of course limited by this setting.
before setting the values for the PID controller in par. group 20-9*.
2 Parameter Description
2
Run on Reference/No
195
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