GE Ecomagination AF-600 FP Programming Manual page 164

Parameter Description
CL-81 PID Normal/ Inverse Control
Option: Function:
setpoint reference. This behaviour is common for
temperature-controlled cooling applications, such
as cooling towers.
CL-82 PID Start Speed [RPM]
Range: Function:
NOTICE
0 [0 -
RPM par.
*
This parameter is only visible if
F-17
parameter K-02 Motor Speed Unit is set to
RPM]
[0] RPM.
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 is
reached, the frequency converter automatically
switches to closed-loop mode, and the PID
controller begins to function. This is useful in
applications that require quick acceleration to a
minimum speed at start-up.
CL-83 PID Start Speed [Hz]
Range: Function:
NOTICE
0 Hz [0 -
*
par.
This parameter is only visible if
F-15
parameter K-02 Motor Speed Unit is set to
Hz]
[1] Hz.
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 is
reached, the frequency converter automatically
switches to closed-loop mode and the PID
controller begins to function. This is useful in
applications that require quick acceleration to a
minimum speed at start-up.
CL-84 On Reference Bandwidth
Range: Function:
5 % [0 - When the difference between the feedback and
*
200 %] the setpoint reference is less than the value of
this parameter, the frequency converter's display
shows Run on Reference. This status can be
communicated externally by programming the
function of a digital output for [8] Run on
Reference/No Warning. Also, for serial communi-
cations, the On Reference status bit of the
frequency converter status word is high (value =
1).
The On Reference Bandwidth is calculated as a
percentage of the setpoint reference.
DET-620D
AF-600 FP™ Programming Guide
3.22.6 CL-9# PID Controller
This group provides the ability to manually adjust the PID
controller. By adjusting the PID controller parameters, the
control performance may be improved. See the AF-600 FP
AF-600 FP Design Guide, for guidelines on adjusting the PID
controller parameters.
CL-91 PID Anti Windup
Option: Function:
[0] Off The integrator continues to change value also after
[1] On
*
CL-93 PID Proportional Gain
Range:
0.50
*
If (Error x Gain) jumps with a value equal to what is set in
parameter CL-14 Maximum Reference/Feedb., the PID
controller tries to change the output speed equal to what
is set in parameter F-17 Motor Speed High Limit [RPM]/
parameter F-15 Motor Speed High Limit [Hz]. However, the
output speed is limited by this setting.
Calculate the proportional band (error causing output to
change from 0–100%) can be calculated with the formula:
1
Proportional Gain
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NOTICE
Option [1] On is activated automatically, if 1 of
the following options is selected in parameters
in group XC-## Ext. Closed Loop: [0] Normal, [X]
Enabled Ext CLX PID.
output has reached 1 of the extremes. This can
afterwards cause a delay of change of the output of
the controller.
The integrator is locked if the output of the built-in
PID controller has reached 1 of the extremes
(minimum or maximum value) and therefore is not
able to add further changes to the value of the
process parameter controlled. This allows the controller
to respond more quickly when it can control the
system again.
Function:
[0 - 10] The proportional gain indicates the number of
times the error between the setpoint and the
feedback signal is to be applied.
× Max Reference
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