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:
0
RPM
*
[0 -
par.
F-17
RPM]
NOTICE
This parameter is only visible if
parameter K-02 Motor Speed Unit
is set to
[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:
0 Hz
*
[0 -
par.
F-15
Hz]
NOTICE
This parameter is only visible if
parameter K-02 Motor Speed Unit
is set to
[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 -
200 %]
When the difference between the feedback and
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.
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:
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
.
[0]
Off
The integrator continues to change value also after
output has reached 1 of the extremes. This can
afterwards cause a delay of change of the output of
the controller.
[1]
*
On
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.
CL-93 PID Proportional Gain
Range:
Function:
0.50
*
[0 - 10] The proportional gain indicates the number of
times the error between the setpoint and the
feedback signal is to be applied.
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
×
Max
Reference
Parameter Description
AF-600 FP
™
Programming Guide
DET-620D
03/2016 All rights reserved.
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