20-79 Autotuning
Option:
Function:
This parameter starts the auto-tuning sequence.
Once the auto-tuning has successfully
completed and the settings have been
accepted or rejected by pressing [OK] or
[Cancel] at the end of tuning, this parameter is
reset to
[0] Disabled
.
[0]
*
Disabled
[1]
PID
Enables PID auto-tuning.
[2]
Smart
Process
Enables smart process control auto-tuning. That
automatically selects the best suitable controller
principle (PID or DRC).
[3]
DRC
This option is activated by SPC auto-tuning. Not
typically used as a manual option.
3.17.4 20-8* PID Basic Settings
This parameter group is used to configure the basic
operation of the PID controller, including:
•
Response to feedback above or below the
setpoint.
•
The speed at which it first starts functioning.
•
When it indicates that the system has reached
the setpoint.
20-81 PID Normal/ Inverse Control
Option:
Function:
[0]
*
Normal The frequency converter’s output frequency
decreases when the feedback is greater than the
setpoint reference. This behavior is common for
pressure-controlled supply fan and pump
applications.
[1]
Inverse The frequency converter’s output frequency
increases when the feedback is greater than the
setpoint reference.
20-82 PID Start Speed [RPM]
Range:
Function:
Size
related
*
[ 0 -
par.
4-13
RPM]
NOTICE
This parameter is only visible if
parameter 0-02 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
20-82 PID Start Speed [RPM]
Range:
Function:
require quick acceleration to a minimum
speed at start-up.
20-83 PID Start Speed [Hz]
Range:
Function:
Size
related
*
[ 0 -
par.
4-14
Hz]
NOTICE
This parameter is only visible if
parameter 0-02 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.
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
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.
Parameter Description
Programming Guide
MG20OB02
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