Danfoss VLT Midi Drive FC 280 Programming Guide

7-31 Process PID Anti Windup
Option: Function:
[0] O Continues regulation of an error even when the
output frequency cannot be increased or decreased.
[1] * On Ceases regulation of an error when the output
frequency can no longer be adjusted.
7-32 Process PID Start Speed
Range: Function:
0 RPM* [0 -
6000
RPM]
Enter the motor speed to be attained as a
start signal for commencement of PID
control. When the power is switched on, the
frequency converter starts to ramp and then
operates under speed open-loop control.
When the process PID start speed is reached,
the frequency converter changes to process
PID control.
7-33 Process PID Proportional Gain
Range: Function:
Size related* [0 - 10] Enter the PID proportional gain. The
proportional gain multiplies the error
between the setpoint and the feedback
signal.
7-34 Process PID Integral Time
Range: Function:
9999 s* [0.10 -
9999 s]
Enter the PID integral time. The integrator
provides an increasing gain at a constant
error between the setpoint and the
feedback signal. The integral time is the
time needed by the integrator to reach the
same gain as the proportional gain.
7-35 Process PID Dierentiation Time
Range: Function:
0 s* [0 - 20 s] Enter the PID dierentiation time. The dieren-
tiator does not react to a constant error, but
provides a gain only when the error changes.
The shorter the PID dierentiation time, the
stronger the gain from the dierentiator.
7-36 Process PID Di. Gain Limit
Range: Function:
5* [1 - 50] Enter a limit for the dierentiator gain. If there is
no limit, the dierentiator gain increases when
there are fast changes. To obtain a pure dieren-
tiator gain at slow changes and a constant
dierentiator gain where fast changes occur, limit
the dierentiator gain.
7-38 Process PID Feed Forward Factor
Range: Function:
0 %* [0 -
200 %]
Enter the PID feed forward (FF) factor. The FF
factor sends a constant fraction of the reference
signal to bypass the PID control, so the PID
control only aects the remaining fraction of the
control signal. Any change to this parameter
aects the motor speed. When the FF factor is
activated, it provides less overshoot, and high
dynamics when changing the setpoint.
Parameter 7-38 Process PID Feed Forward Factor is
active when parameter 1-00 Conguration Mode
is set to [3] Process.
7-39 On Reference Bandwidth
Range: Function:
5 %* [0 -
200 %]
Enter the on-reference bandwidth. When the
PID control error (the dierence between the
reference and the feedback) is less than the
value of this parameter, the on-reference
status bit is 1.
7-40 Process PID I-part Reset
Option: Function:
[0] * No
[1] Yes Select [1] Yes to reset the I-part of the process PID
controller. The selection automatically returns to [0]
No. Resetting the I-part makes it possible to start from
a well-dened point after changing something in the
process, for example changing a textile roll.
7-41 Process PID Output Neg. Clamp
Range: Function:
-100 %* [ -100 - 100 %] Enter a negative limit for the process
PID controller output.
7-42 Process PID Output Pos. Clamp
Range: Function:
100 %* [ -100 - 100 %] Enter a positive limit for the process
PID controller output.
7-43 Process PID Gain Scale at Min. Ref.
Range: Function:
100 %* [0 -
100 %]
Enter a scaling percentage to apply to the
process PID output when operating at the
minimum reference. The scaling percentage is
adjusted linearly between the scale at
minimum reference (parameter 7-43 Process PID
Gain Scale at Min. Ref.) and the scale at
maximum reference (parameter 7-44 Process
PID Gain Scale at Max. Ref.).
Parameter Descriptions
VLT
®
Midi Drive FC 280
68 Danfoss A/S © 12/2015 All rights reserved. MG07C102
44

Danfoss VLT Midi Drive FC 280 Specifications

General

Brand	Danfoss
Model	VLT Midi Drive FC 280
Category	DC Drives
Language	English