20-82 PID Start Speed [RPM]
Range: Function:
Application
dependent*
[Application dependant] When the frequency converter is first started, it initially ramps up to this output speed in Open Loop
Mode, following the active Ramp Up Time. When the output speed programmed here is reached,
the frequency converter will automatically switch to Closed Loop Mode and the PID Controller will
begin to function. This is useful in applications in which the driven load must first quickly accelerate
to a minimum speed when it is started.
NB!
This parameter will only be visible if par. 0-02
Motor Speed Unit
is set to [0], RPM.
20-83 PID Start Speed [Hz]
Range: Function:
Application
dependent*
[Application dependant] When the frequency converter is first started, it initially ramps up to this output frequency in Open
Loop Mode, following the active Ramp Up Time. When the output frequency programmed here is
reached, the frequency converter will automatically switch to Closed Loop Mode and the PID Con-
troller will begin to function. This is useful in applications in which the driven load must first quickly
accelerate to a minimum speed when it is started.
NB!
This parameter will only be visible if par. 0-02
Motor Speed Unit
is set to [1], Hz.
20-84 On Reference Bandwidth
Range: Function:
5 %* [0 - 200 %] 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
Run on Reference/No
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
is calculated as a percentage of the setpoint reference.
3.18.8 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 PID in the VLT HVAC Drive Design Guide,
MG.11.Bx.yy
for guidelines on adjusting the PID Controller parameters.
20-91 PID Anti Windup
Option: Function:
[0] Off
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.
[1] * On
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.
20-93 PID Proportional Gain
Range: Function:
0.50 N/A* [0.00 - 10.00 N/A]
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
187
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