GE AF-650 GP Programming Manual page 156

Parameter Descriptions
PI-36 Process PID Diff. Gain Limit
Range: Function:
5 [1 - 50] Enter a limit for the differentiator gain. If there is
*
no limit, the differentiator gain increases when
there are fast changes. To obtain a pure differen-
tiator gain at slow changes and a constant
differentiator gain where fast changes occur, limit
the differentiator gain.
PI-38 Process PID Feed Forward Factor
Range: Function:
0 % [0 - Enter the PID feed forward factor. The factor
*
200 %] sends a constant fraction of the reference signal
to bypass the PID control, so the PID control
only affects the remaining fraction of the control
signal. Any change to this parameter affects the
motor speed. When the feed forward factor is
activated, it provides less overshoot and high
dynamics when changing the set-point.
Parameter PI-38 Process PID Feed Forward Factor is
active when parameter H-40 Configuration Mode
is set to [3] Process.
PI-39 On Reference Bandwidth
Range: Function:
5 % [0 - Enter the on-reference bandwidth. When the
*
200 %] PID control error (the difference between the
reference and the feedback) is less than the
value of this parameter, the on-reference
status bit is 1.
PI-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-defined point after changing something in the
process, for example changing a textile roll.
PI-41 Process PID Output Neg. Clamp
Range:
-100 % [-100 - par. PI-42 %] Enter a negative limit for the
*
PI-42 Process PID Output Pos. Clamp
Range:
100 % [par. PI-41 - 100 %] Enter a positive limit for the
*
process PID controller output.
PI-43 Process PID Gain Scale at Min. Ref.
Range: Function:
100 % [0 - Enter a scaling percentage to apply to the
*
100 %] process PID output when operating at the
DET-618D
AF-650 GP™ Programming Guide
Function:
process PID controller output.
Function:
02/2016 All rights reserved.
PI-43 Process PID Gain Scale at Min. Ref.
Range: Function:
minimum reference. The scaling percentage is
adjusted linearly between the scale at
minimum reference (parameter PI-43 Process
PID Gain Scale at Min. Ref.) and the scale at
maximum reference (parameter PI-44 Process
PID Gain Scale at Max. Ref.).
PI-44 Process PID Gain Scale at Max. Ref.
Range: Function:
100 % [0 - Enter a scaling percentage to apply to the
*
100 %] process PID output when operating at the
maximum reference. The scaling percentage is
adjusted linearly between the scale at
minimum reference (parameter PI-43 Process
PID Gain Scale at Min. Ref.) and the scale at
maximum reference (parameter PI-44 Process
PID Gain Scale at Max. Ref.).
PI-45 Process PID Feed Fwd Resource
Option: Function:
[0] No function Select which frequency converter input
*
should be used as the feed forward
factor. The factor is added to the output
of the PID controller. This increases
dynamic performance.
[1] Analog Input 53
[2] Analog Input 54
[7] Frequency input
29
[8] Frequency input
33
[11] Local bus
reference
[20] Digital Potenti-
ometer
[21] Analog input
X30/11
[22] Analog input
X30/12
[32] Bus PCD Selects a fieldbus reference configured
by parameter O-02 Control Word Source.
Change parameter O-42 PCD Write Config-
uration for the bus used to make the
feed-forward available in
parameter PI-48 PCD Feed Forward. Use
index 1 for feed forward [748] (and index
2 for reference [1682]).
PI-46 Process PID Feed Fwd Normal/ Inv. Ctrl.
Option: Function:
[0] Normal Select [0] Normal to set the feed-forward factor to
*
treat the FF resource as a positive value.
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